Species Recorded | Taxon | Scientific Name | Common Name | Records | Latest |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gasteruptiidae | a Gasteruptiidae species (unidentified) | 1 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gasteruption | a Gasteruption species (unidentified) | 5 | 2019 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gasteruption assectator | a parasitic wasp | 2 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gasteruption jaculator | a parasitic wasp | 27 | 2024 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gelis agilis | an insect - hymenopteran | 1 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gelis areator | an insect - hymenopteran | 1 | 2002 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gelis festinans | an insect - hymenopteran | 1 | 2008 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Glyphicnemis | a Glyphicnemis species (unidentified) | 1 | 2016 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Glypta ceratites | an ichneumon wasp | 2 | 1998 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Glyptapanteles inclusus | a braconid wasp | 1 | 2009 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Glyptapanteles lateralis | a braconid wasp | 1 | 1997 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Glypta trochanterata | an ichneumon wasp | 1 | 2003 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gorytes laticinctus | a solitary wasp | 6 | 2020 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gorytes quadrifasciatus | 4-banded Digger Wasp | 6 | 2013 |
| ant, bee, wasp, sawfly or ichneumon (and others) | Gymnomerus laevipes | a potter wasp or mason wasp | 3 | 2008 |
| beetle | Gabrius appendiculatus | a rove beetle | 2 | 2020 |
| beetle | Gabrius breviventer | a rove beetle | 6 | 2020 |
| beetle | Gabrius splendidulus | a rove beetle | 2 | 2020 |
| beetle | Galeruca tanaceti | a leaf beetle | 1 | 2000 |
| beetle | Galerucella | a Galerucella species (unidentified) | 2 | 2023 |
| beetle | Galerucella calmariensis | a leaf beetle | 13 | 2023 |
| beetle | Galerucella lineola | Brown Willow Beetle | 16 | 2021 |
| beetle | Galerucella pusilla | a leaf beetle | 1 | 1983 |
| beetle | Galerucella sagittariae | a leaf beetle | 7 | 2017 |
| beetle | Galerucella tenella | a leaf beetle | 4 | 2018 |
| beetle | Gastrophysa | a Gastrophysa species (unidentified) | 2 | 2023 |
| beetle | Gastrophysa polygoni | a leaf beetle | 12 | 2021 |
| beetle | Gastrophysa viridula | Green Dock Beetle | 351 | 2024 |
| beetle | Gauropterus fulgidus | a rove beetle | 1 | 2015 |
| beetle | Geotrupes mutator | a dumbledor | 1 | 1965 |
| beetle | Geotrupes spiniger | a dumbledor | 10 | 2023 |
| beetle | Geotrupes stercorarius | Dor Beetle | 6 | 2019 |
| beetle | Glaphyra umbellatarum | a longhorn beetle | 1 | 2018 |
| beetle | Glischrochilus quadriguttatus | a pollen or sap beetle | 2 | 2016 |
| beetle | Glocianus distinctus | a weevil | 8 | 2023 |
| beetle | Gnathoncus nannetensis | a carrion beetle | 2 | 2016 |
| beetle | Gonioctena olivacea | Broom Leaf Beetle | 2 | 2004 |
| beetle | Gonodera luperus | a darkling beetle | 3 | 2013 |
| beetle | Gracilia minuta | a longhorn beetle | 1 | 2019 |
| beetle | Grammoptera | a Grammoptera species (unidentified) | 1 | 2012 |
| beetle | Grammoptera abdominalis | a longhorn beetle | 1 | 1950 |
| beetle | Grammoptera ruficornis | a longhorn beetle | 211 | 2024 |
| beetle | Graptodytes bilineatus | a water beetle | 37 | 2009 |
| beetle | Graptodytes pictus | a water beetle | 86 | 2013 |
| beetle | Graptus triguttatus | a weevil | 10 | 2019 |
| beetle | Grynobius planus | a wood boring beetle | 6 | 2021 |
| beetle | Grypus equiseti | Horsetail Weevil | 6 | 2010 |
| beetle | Gymnetron melanarium | a weevil | 9 | 2010 |
| beetle | Gymnetron veronicae | Brooklime Gull Weevil | 1 | 2024 |
| beetle | Gymnetron villosulum | a weevil | 5 | 2008 |
| beetle | Gyrinidae | Whirligig beetles | 42 | 2017 |
| beetle | Gyrinus | Whirligig Beetle | 49 | 2021 |
| beetle | Gyrinus caspius | a whirligig | 3 | 2014 |
| beetle | Gyrinus marinus | a whirligig | 18 | 2021 |
| beetle | Gyrinus substriatus | a whirligig | 101 | 2022 |
| beetle | Gyrinus urinator | a whirligig | 1 | 2014 |
| beetle | Gyrohypnus angustatus | a rove beetle | 1 | 1978 |
| beetle | Gyrohypnus fracticornis | a rove beetle | 16 | 2023 |
| bird | Gallinago gallinago | Snipe | 10257 | 2025 |
| bird | Gallinula chloropus | Moorhen | 22534 | 2025 |
| bird | Garrulus glandarius | Jay | 25767 | 2025 |
| bird | Gavia | Indet. Diver | 3 | 2014 |
| bird | Gavia arctica | Black-throated Diver | 300 | 2021 |
| bird | Gavia immer | Great Northern Diver | 490 | 2022 |
| bird | Gavia pacifica | Pacific Diver | 1 | 2009 |
| bird | Gavia stellata | Red-throated Diver | 162 | 2022 |
| bird | Geopelia cuneata | Diamond Dove | 2 | 2018 |
| bird | Glareola nordmanni | Black-winged Pratincole | 1 | 1986 |
| bird | Glareola pratincola | Collared Pratincole | 78 | 2020 |
| bird | Goose sp.(a grey goose (unidentified)) | a grey goose (unidentified) | 2 | 2004 |
| bird | Grus grus | Crane | 88 | 2021 |
| bird | Gulosus aristotelis | Shag | 69 | 2022 |
| booklouse or barklouse | Graphopsocus cruciatus | a booklouse or barklouse | 8 | 2021 |
| bug | Gargara genistae | a treehopper | 3 | 2023 |
| bug | Gastrodes abietum | Spruce Cone Bug | 1 | 2013 |
| bug | Gerridae | Pondskaters | 119 | 2021 |
| bug | Gerris | Pondskater | 156 | 2025 |
| bug | Gerris (Gerris) argentatus | Little Pondskater | 1 | 1949 |
| bug | Gerris (Gerris) gibbifer | a pondskater | 8 | 2006 |
| bug | Gerris (Gerris) lacustris | Common Pondskater | 142 | 2023 |
| bug | Gerris (Gerris) odontogaster | Toothed Pondskater | 18 | 2013 |
| bug | Gerris (Gerris) thoracicus | a pondskater | 23 | 2013 |
| bug | Gerroidea | a Gerroidea species (unidentified) | 1 | 2005 |
| bug | Globiceps flavomaculatus sensu lato | an insect - true bug (Hemiptera) | 2 | 2023 |
| bug | Gonocerus acuteangulatus | Box Bug | 32 | 2023 |
| bug | Graphocephala fennahi | Rhododendron Leafhopper | 1 | 2017 |
| bug | Graptopeltus lynceus | a ground bug | 1 | 2007 |
| bug | Grypocoris (Lophyromiris) stysi | a plantbug or grassbug | 78 | 2024 |
| caddis fly | Glossosomatidae | a Glossosomatidae species (unidentified) | 1 | 1993 |
| caddis fly | Glyphotaelius pellucidus | a caddisfly | 27 | 2023 |
| caddis fly | Goera pilosa | a caddisfly | 6 | 2019 |
| centipede | Geophilidae | a Geophilidae species (unidentified) | 1 | 2012 |
| centipede | Geophilomorpha | a Geophilomorpha species (unidentified) | 2 | 2023 |
| centipede | Geophilus carpophagus sensu lato | Luminous centipede | 2 | 2023 |
| centipede | Geophilus flavus | a centipede | 3 | 1997 |
| centipede | Geophilus truncorum | Small geophilus | 2 | 1999 |
| crustacean | Galathea squamifera | Black Squat Lobster | 2 | 1989 |
| crustacean | Gammarellus homari | a crustacean | 4 | 1940 |
| crustacean | Gammaridae | a Gammaridae freshwater shrimp (unidentified) | 8 | 2023 |
| crustacean | Gammarus | Freshwater Shrimp (Gammarus) | 179 | 2025 |
| crustacean | Gammarus chevreuxi | a freshwater shrimp | 1 | 2005 |
| crustacean | Gammarus lacustris | a freshwater shrimp | 3 | 2015 |
| crustacean | Gammarus locusta | a crustacean | 2 | 1939 |
| crustacean | Gammarus pulex/fossarum agg. | a freshwater shrimp | 121 | 2020 |
| crustacean | Gammarus salinus | a crustacean | 27 | 1973 |
| crustacean | Gammarus zaddachi | a freshwater shrimp | 11 | 2013 |
| crustacean | Gastrosaccus spinifer | a crustacean | 1 | 1939 |
| diatom | Gomphonema | a gomphonema diatom (unidentified) | 1 | 2010 |
| diatom | Gomphonema angustatum | a diatom | 1 | 2015 |
| diatom | Gomphonema angustum | a diatom | 1 | 2015 |
| diatom | Gomphonema olivaceum | a diatom | 1 | 2015 |
| diatom | Gomphonema pumilum | a diatom | 1 | 2015 |
| dragonfly, hawker or damselfly | Gomphidae | a Gomphidae species (unidentified) | 1 | 2020 |
| fish | Gadus morhua | Cod | 14 | 2021 |
| fish | Gaidropsarus vulgaris | Three-bearded Rockling | 3 | 2012 |
| fish | Galeorhinus galeus | Tope | 3 | 2011 |
| fish | Gasterosteidae | a stickleback (unidentified) | 36 | 2017 |
| fish | Gasterosteus aculeatus | Three-spined Stickleback | 301 | 2025 |
| fish | Glyptocephalus cynoglossus | Witch | 3 | 1999 |
| fish | Gobio gobio | Gudgeon | 53 | 2018 |
| fish | Gobiusculus flavescens | Two-spotted Goby | 2 | 1933 |
| fish | Gobius niger | Black Goby | 2 | 2016 |
| fish | Gobius paganellus | Rock Goby | 1 | 1999 |
| fish | Gymnammodytes semisquamatus | Smooth Sandeel | 1 | 1999 |
| fungus | Gabarnaudia | a Gabarnaudia species (unidentified) | 1 | 2017 |
| fungus | Galactinia saniosa | a fungus | 1 | 1999 |
| fungus | Galerina | a Galerina species (unidentified) | 1 | 1998 |
| fungus | Galerina atkinsoniana | Hairy Bell | 4 | 2010 |
| fungus | Galerina clavata | Ribbed Bell | 84 | 2014 |
| fungus | Galerina graminea | Turf Bell | 25 | 2020 |
| fungus | Galerina heterocystis | an agaric | 1 | 2003 |
| fungus | Galerina hypnorum | Moss Bell | 8 | 2014 |
| fungus | Galerina marginata | Funeral Bell | 94 | 2021 |
| fungus | Galerina pumila | Dwarf Bell | 10 | 2012 |
| fungus | Galerina septentrionalis | an agaric | 1 | 2004 |
| fungus | Galerina sideroides | an agaric | 6 | 2014 |
| fungus | Galerina sphagnorum | an agaric | 1 | 1996 |
| fungus | Galerina stylifera | an agaric | 32 | 2014 |
| fungus | Galerina uncialis | an agaric | 1 | 2005 |
| fungus | Galerina vittiformis | Hairy Leg Bell | 129 | 2014 |
| fungus | Ganoderma | a basidiomycete fungus (unidentified) | 20 | 2025 |
| fungus | Ganoderma adspersum | Bulging Bracket | 98 | 2023 |
| fungus | Ganoderma applanatum | Artist's Bracket | 35 | 2021 |
| fungus | Ganoderma lucidum | Lacquered Bracket | 28 | 2017 |
| fungus | Ganoderma resinaceum | Resinous Bracket | 1 | 2022 |
| fungus | Geastrum | a Geastrum (Earthstar) species (unidentified) | 6 | 2020 |
| fungus | Geastrum fimbriatum | Sessile Earthstar | 16 | 2012 |
| fungus | Geastrum fornicatum | Arched Earthstar | 1 | 1994 |
| fungus | Geastrum michelianum | Collared Earthstar | 126 | 2023 |
| fungus | Geastrum pectinatum | Beaked Earthstar | 4 | 2014 |
| fungus | Geastrum rufescens | Rosy Earthstar | 5 | 2009 |
| fungus | Geastrum striatum | Striated Earthstar | 6 | 2012 |
| fungus | Geoglossum | Earthtongue | 2 | 2021 |
| fungus | Geoglossum cookeanum | an ascomycete fungus | 7 | 2010 |
| fungus | Geoglossum fallax | Deceptive Earthtongue | 2 | 2008 |
| fungus | Geoglossum umbratile | Plain Earthtongue | 13 | 2020 |
| fungus | Geopora sumneriana | Cedar Cup | 4 | 2020 |
| fungus | Geopyxis carbonaria | Stalked Bonfire Cup | 1 | 2014 |
| fungus | Geoscypha violacea | a fungus | 1 | 2021 |
| fungus | Gliophorus irrigatus | Slimy Waxcap | 43 | 2020 |
| fungus | Gliophorus laetus | Heath Waxcap | 2 | 2009 |
| fungus | Gliophorus psittacinus | Parrot Wax-cap | 188 | 2023 |
| fungus | Gloeocystidiellum porosellum | a fungus | 1 | 1987 |
| fungus | Gloioxanthomyces vitellinus | Glistening Waxcap | 1 | 2001 |
| fungus | Glomus microcarpum | Small-Spored Pea Truffle | 2 | 2008 |
| fungus | Gloniopsis praelonga | a fungus | 3 | 2010 |
| fungus | Gnomonia cerastis | an ascomycete fungus | 5 | 1998 |
| fungus | Golovinomyces biocellatus s. lat. | a conidial powdery mildew | 3 | 2008 |
| fungus | Golovinomyces cichoracearum var. cichoracearum | Cucumber Powdery Mildew | 11 | 2014 |
| fungus | Golovinomyces cynoglossi s. lat. | a conidial powdery mildew | 6 | 2014 |
| fungus | Golovinomyces depressus | Burdock Mildew | 3 | 2009 |
| fungus | Golovinomyces fischeri | a conidial powdery mildew | 1 | 1997 |
| fungus | Golovinomyces orontii | a conidial powdery mildew | 2 | 2008 |
| fungus | Golovinomyces sordidus | Plantain Mildew | 18 | 2014 |
| fungus | Golovinomyces sparsus | a conidial powdery mildew | 2 | 2008 |
| fungus | Gomphidius glutinosus | Slimy Spike | 1 | 1970 |
| fungus | Gomphidius maculatus | Larch Spike | 8 | 2014 |
| fungus | Graddonia coracina | an ascomycete fungus | 2 | 2008 |
| fungus | Granulobasidium vellereum | Vellum Crust | 3 | 2010 |
| fungus | Grifola frondosa | Hen Of The Woods | 8 | 2014 |
| fungus | Guepinia helvelloides | Salmon Salad | 1 | 2010 |
| fungus | Guignardia aesculi | a fungus | 5 | 2015 |
| fungus | Gymnopilus bellulus | an agaric | 3 | 2013 |
| fungus | Gymnopilus hybridus | an agaric | 3 | 2003 |
| fungus | Gymnopilus junonius | Spectacular Rustgill | 17 | 2014 |
| fungus | Gymnopilus penetrans | Common Rustgill | 61 | 2021 |
| fungus | Gymnopilus sapineus | Scaly Rustgill | 1 | 2013 |
| fungus | Gymnopus | a Micromphale species (unidentified) | 4 | 1999 |
| fungus | Gymnopus androsaceus | Horsehair Parachute | 20 | 2008 |
| fungus | Gymnopus aquosus | Watery Toughshank | 4 | 2012 |
| fungus | Gymnopus brassicolens | a basidiomycete fungus | 1 | 1993 |
| fungus | Gymnopus brassicolens var. brassicolens | Cabbage Parachute | 4 | 1999 |
| fungus | Gymnopus confluens | Clustered Tough-shank | 158 | 2020 |
| fungus | Gymnopus dryophilus | Russet Shank | 364 | 2024 |
| fungus | Gymnopus erythropus | Redleg Toughshank | 9 | 2019 |
| fungus | Gymnopus fuscopurpureus | a basidiomycete fungus | 1 | 1978 |
| fungus | Gymnopus fusipes | Spindle Shank | 53 | 2022 |
| fungus | Gymnopus impudicus | a basidiomycete fungus | 3 | 2000 |
| fungus | Gymnopus ocior | Spring Toughshank | 18 | 2012 |
| fungus | Gymnopus peronatus | Wood Woolly-foot | 89 | 2020 |
| fungus | Gymnopus quercophilus | Oak Toughshank | 1 | 2008 |
| fungus | Gymnosporangium clavariiforme | Tongues Of Fire | 3 | 2015 |
| fungus | Gymnosporangium confusum | a rust | 22 | 2022 |
| fungus | Gymnosporangium sabinae | Pear Rust | 5 | 2023 |
| fungus | Gyrodon lividus | Alder Bolete | 2 | 2014 |
| grasshopper, cricket or true cricket | Gomphocerippus rufus | Rufous Grasshopper | 59 | 2022 |
| hairworm | Gordius | a Gordius species (unidentified) | 1 | 2009 |
| leech, flatworm or ribbon worm | Girardia tigrina | a flatworm | 3 | 2020 |
| leech, flatworm or ribbon worm | Glossiphonia | a Glossiphonia leech (unidentified) | 6 | 2014 |
| leech, flatworm or ribbon worm | Glossiphonia complanata | a leech | 80 | 2019 |
| leech, flatworm or ribbon worm | Glossiphoniidae | a Glossiphonidae leech (unidentified) | 19 | 2020 |
| lichen | Glaucomaria carpinea | a lichen | 7 | 2020 |
| lichen | Glaucomaria rupicola var. rupicola | Slow-Growing Lichen | 2 | 2011 |
| lichen | Graphis elegans | a lichen | 3 | 1996 |
| lichen | Graphis inustuloides | a lichen | 1 | 1996 |
| lichen | Graphis scripta s. lat. | Script Lichen | 21 | 2023 |
| lichen | Gyalecta | a Gyalecta species (unidentified) | 1 | 2023 |
| lichen | Gyalolechia flavovirescens | a lichen | 2 | 2011 |
| millipede | Geoglomeris subterranea | a pill millepede | 1 | 1987 |
| millipede | Glomeris marginata | Pill Millipede | 95 | 2023 |
| mollusc | Galba (Galba) truncatula | Dwarf Pond Snail | 16 | 2013 |
| mollusc | Gastrochaenidae | a Gastrochaenidae species (unidentified) | 1 | 2021 |
| mollusc | Gastropoda | Snails | 14 | 2023 |
| mollusc | Gyraulus (Armiger) crista | Nautilus Ramshorn | 16 | 2013 |
| mollusc | Gyraulus (Gyraulus) albus | White Ramshorn | 26 | 2013 |
| moss | Grimmia | a Grimmia species (unidentified) | 1 | 2013 |
| moss | Grimmia donniana | Donn's Grimmia | 1 | 1990 |
| moss | Grimmia orbicularis | Round-fruited Grimmia | 3 | 1998 |
| moss | Grimmia pulvinata | Grey-cushioned Grimmia | 142 | 2023 |
| moss | Gymnostomum calcareum | Blunt-leaf Tufa-moss | 1 | 1963 |
| moss | Gyroweisia tenuis | Slender Stubble-moss | 4 | 2016 |
| moth or butterfly - butterfly | Gonepteryx rhamni | Brimstone (butterfly) | 13521 | 2025 |
| moth or butterfly - butterfly | Gonepteryx rhamni rhamni | Brimstone | 1 | 2023 |
| moth or butterfly - macro moth | Gandaritis pyraliata | Barred Straw | 492 | 2024 |
| moth or butterfly - macro moth | Gastropacha quercifolia | Lappet | 20 | 2022 |
| moth or butterfly - macro moth | Geometra papilionaria | Large Emerald | 100 | 2024 |
| moth or butterfly - macro moth | Geometridae | a Geometridae moth (unidentified) | 5 | 2023 |
| moth or butterfly - macro moth | Gortyna flavago | Frosted Orange | 333 | 2024 |
| moth or butterfly - macro moth | Graphiphora augur | Double Dart | 30 | 2019 |
| moth or butterfly - macro moth | Griposia aprilina | Merveille du Jour | 221 | 2024 |
| moth or butterfly - macro moth | Gymnoscelis rufifasciata | Double-striped Pug | 3689 | 2024 |
| moth or butterfly - micro moth | Galleria mellonella | Wax Moth | 211 | 2024 |
| moth or butterfly - micro moth | Gelechia rhombella | Spotted Gelechia | 2 | 2007 |
| moth or butterfly - micro moth | Gelechia sororculella | Eyed Gelechia | 3 | 2015 |
| moth or butterfly - micro moth | Gillmeria ochrodactyla | Tansy Plume | 9 | 2020 |
| moth or butterfly - micro moth | Gillmeria pallidactyla | Yarrow Plume | 33 | 2023 |
| moth or butterfly - micro moth | Glyphipterix equitella | Stonecrop Moth | 1 | 1997 |
| moth or butterfly - micro moth | Glyphipterix forsterella | Woodland Sedge-moth | 21 | 2022 |
| moth or butterfly - micro moth | Glyphipterix fuscoviridella | Woodrush Moth | 72 | 2024 |
| moth or butterfly - micro moth | Glyphipterix simpliciella | Cocksfoot Moth | 223 | 2024 |
| moth or butterfly - micro moth | Glyphipterix thrasonella | Eyed Rush Moth | 43 | 2024 |
| moth or butterfly - micro moth | Gracillaria syringella | Common Slender | 275 | 2024 |
| moth or butterfly - micro moth | Grapholita compositella | Meadow Tortrix | 47 | 2023 |
| moth or butterfly - micro moth | Grapholita funebrana | Plum Fruit Moth | 49 | 2023 |
| moth or butterfly - micro moth | Grapholita janthinana | Hawthorn Piercer | 57 | 2024 |
| moth or butterfly - micro moth | Grapholita jungiella | Beautiful Crescent | 53 | 2021 |
| moth or butterfly - micro moth | Grapholita lathyrana | Greenweed Piercer | 1 | 2012 |
| moth or butterfly - micro moth | Grapholita lobarzewskii | Small Fruit Moth | 25 | 2023 |
| moth or butterfly - micro moth | Grapholita lunulana | Northern Crescent | 1 | 1993 |
| moth or butterfly - micro moth | Grapholita molesta | Oriental Fruit Moth | 1 | 2020 |
| moth or butterfly - micro moth | Grapholita tenebrosana | Rose Piercer | 6 | 2022 |
| moth or butterfly - micro moth | Gynnidomorpha alismana | Water-plantain Straw | 11 | 2013 |
| moth or butterfly - micro moth | Gynnidomorpha permixtana | Coast Conch | 1 | 1906 |
| moth or butterfly - micro moth | Gynnidomorpha vectisana | Saltern Straw | 8 | 2018 |
| moth or butterfly - micro moth | Gypsonoma aceriana | White Cloaked Tortrix | 5 | 2022 |
| moth or butterfly - micro moth | Gypsonoma dealbana | Common Cloaked Shoot | 166 | 2022 |
| moth or butterfly - micro moth | Gypsonoma minutana | Small Brindled Tortrix | 3 | 2023 |
| moth or butterfly - micro moth | Gypsonoma oppressana | Mottled Grey Tortrix | 10 | 2024 |
| moth or butterfly - micro moth | Gypsonoma sociana | Mottled White Tortrix | 31 | 2024 |
| peanut worm (sipuncula) | Golfingia (Golfingia) margaritacea | a peanut worm (Sipuncula) | 1 | 1995 |
| plant | Gagea lutea | Yellow Star-of-Bethlehem | 12 | 2017 |
| plant | Galanthus | Snowdrop | 2 | 2010 |
| plant | Galanthus caucasicus | Caucasian Snowdrop | 2 | 2006 |
| plant | Galanthus elwesii | Greater Snowdrop | 7 | 2017 |
| plant | Galanthus nivalis | Snowdrop | 653 | 2025 |
| plant | Galanthus nivalis x plicatus = G. x valentinei | a snowdrop | 5 | 2006 |
| plant | Galanthus plicatus | Pleated Snowdrop | 5 | 2016 |
| plant | Galanthus plicatus subsp. byzantinus | a snowdrop | 6 | 2014 |
| plant | Galanthus plicatus subsp. plicatus | a snowdrop | 11 | 2014 |
| plant | Galanthus sp.or Leucojum sp. | a snowdrop or a snowflake species (unidentified) | 1 | 2020 |
| plant | Galanthus woronowii | Green Snowdrop | 4 | 2014 |
| plant | Galatella linosyris | Goldilocks Aster | 29 | 2015 |
| plant | Galega officinalis | Goat's-rue | 12 | 2019 |
| plant | Galeopsis angustifolia | Red Hemp-nettle | 12 | 2008 |
| plant | Galeopsis bifida | Bifid Hemp-nettle | 18 | 2011 |
| plant | Galeopsis ladanum | Broad-leaved Hemp-nettle | 2 | 1931 |
| plant | Galeopsis tetrahit | Common Hemp-nettle | 196 | 2023 |
| plant | Galeopsis tetrahit agg. | Common Hemp-nettle [agg.] | 14 | 2006 |
| plant | Galinsoga parviflora | Gallant Soldier | 19 | 2015 |
| plant | Galinsoga quadriradiata | Shaggy Soldier | 39 | 2020 |
| plant | Galium | Bedstraw | 39 | 2023 |
| plant | Galium album | Hedge Bedstraw | 2789 | 2024 |
| plant | Galium album subsp. album | Great Hedge Bedstraw | 12 | 2011 |
| plant | Galium album subsp. erectum | Upright Hedge Bedstraw | 214 | 2019 |
| plant | Galium album x verum = G. x pomeranicum | Hybrid Yellow Bedstraw | 16 | 2020 |
| plant | Galium aparine | Cleavers | 7831 | 2025 |
| plant | Galium murale | Small Goosegrass | 3 | 2022 |
| plant | Galium odoratum | Woodruff | 644 | 2024 |
| plant | Galium palustre | Marsh-bedstraw | 999 | 2024 |
| plant | Galium palustre subsp. elongatum | Great Marsh-bedstraw | 17 | 2016 |
| plant | Galium palustre subsp. palustre | Common Marsh-bedstraw | 40 | 2016 |
| plant | Galium parisiense | Wall Bedstraw | 7 | 2020 |
| plant | Galium pumilum | Slender Bedstraw | 7 | 2003 |
| plant | Galium saxatile | Heath Bedstraw | 176 | 2019 |
| plant | Galium spurium | False Cleavers | 3 | 1959 |
| plant | Galium tricornutum | Corn Cleavers | 2 | 1962 |
| plant | Galium uliginosum | Fen Bedstraw | 100 | 2018 |
| plant | Galium verum | Lady's Bedstraw | 3199 | 2024 |
| plant | Galium verum var. maritimum | Lady's Bedstraw | 1 | 1947 |
| plant | Garrya elliptica | Silk-tassel | 35 | 2000 |
| plant | Gastridium ventricosum | Nit-grass | 21 | 2013 |
| plant | Gaudinia fragilis | French Oat-grass | 50 | 2015 |
| plant | Gaura | a Gaura species (unidentified) | 1 | 2012 |
| plant | Genista anglica | Petty Whin | 6 | 2008 |
| plant | Genista hispanica | Spanish Gorse | 7 | 2000 |
| plant | Genista tinctoria | Dyer's Greenweed | 298 | 2024 |
| plant | Genista tinctoria subsp. tinctoria | a dyer's greenweed | 145 | 2004 |
| plant | Gentiana | a Gentiana species (unidentified) | 4 | 2011 |
| plant | Gentianella amarella | Autumn Gentian | 48 | 2015 |
| plant | Gentianella amarella subsp. amarella | an autumn gentian | 52 | 1999 |
| plant | Gentianella amarella subsp. anglica | Early Gentian | 1 | 1955 |
| plant | Geraniaceae | a Geraniaceae species (unidentified) | 1 | 2010 |
| plant | Geranium | Crane's-Bill | 105 | 2023 |
| plant | Geranium columbinum | Long-stalked Crane's-bill | 271 | 2024 |
| plant | Geranium dissectum | Cut-leaved Crane's-bill | 4637 | 2024 |
| plant | Geranium endressii | French Crane's-bill | 47 | 2017 |
| plant | Geranium endressii x versicolor = G. x oxonianum | Druce's Crane's-bill | 29 | 2023 |
| plant | Geranium himalayense | Himalayan Crane's-bill | 1 | 2011 |
| plant | Geranium ibericum x platypetalum = G. x magnificum | Purple Crane's-bill | 1 | 2022 |
| plant | Geranium lucidum | Shining Crane's-bill | 1339 | 2024 |
| plant | Geranium macrorrhizum | Rock Crane's-bill | 9 | 2023 |
| plant | Geranium maderense | Giant Herb-Robert | 2 | 2007 |
| plant | Geranium molle | Dove's-foot Crane's-bill | 2515 | 2024 |
| plant | Geranium molle var. aequale | a crane's-bill | 1 | 1933 |
| plant | Geranium phaeum | Dusky Crane's-bill | 8 | 2019 |
| plant | Geranium pratense | Meadow Crane's-bill | 1382 | 2025 |
| plant | Geranium pratense x himalayense = G. x johnsonii | a crane's-bill | 1 | 2022 |
| plant | Geranium purpureum | Little-Robin | 32 | 2019 |
| plant | Geranium pusillum | Small-flowered Crane's-bill | 113 | 2021 |
| plant | Geranium pyrenaicum | Hedgerow Crane's-bill | 1565 | 2024 |
| plant | Geranium robertianum | Herb-Robert | 7683 | 2025 |
| plant | Geranium robertianum subsp. maritimum | a crane's-bill | 2 | 2014 |
| plant | Geranium rotundifolium | Round-leaved Crane's-bill | 723 | 2024 |
| plant | Geranium sanguineum | Bloody Crane's-bill | 56 | 2016 |
| plant | Geranium sanguineum var. striatum | a crane's-bill | 1 | 2000 |
| plant | Geranium sylvaticum | Wood Crane's-bill | 1 | 2023 |
| plant | Geranium versicolor | Pencilled Crane's-bill | 16 | 2023 |
| plant | Geum chiloense | Avens | 1 | 1994 |
| plant | Geum rivale | Water Avens | 27 | 2019 |
| plant | Geum rivale x urbanum = G. x intermedium | Hybrid Avens | 1 | 1994 |
| plant | Geum urbanum | Wood Avens | 5389 | 2025 |
| plant | Ginkgo biloba | Ginkgo | 29 | 2022 |
| plant | Gladiolus communis | Eastern Gladiolus | 8 | 2019 |
| plant | Gladiolus communis subsp. byzantinus | a gladiolus | 1 | 2012 |
| plant | Glandora diffusa | a flowering plant | 1 | 2012 |
| plant | Glaucium flavum | Yellow Horned Poppy | 15 | 2008 |
| plant | Glebionis coronaria | Crown Daisy | 3 | 1953 |
| plant | Glebionis segetum | Corn Marigold | 30 | 2019 |
| plant | Glechoma | a Glechoma species (unidentified) | 3 | 2011 |
| plant | Glechoma hederacea | Ground-ivy | 6048 | 2025 |
| plant | Gleditsia triacanthos | Honey locust | 21 | 2015 |
| plant | Glyceria | Sweet-Grass | 309 | 2024 |
| plant | Glyceria declinata | Small Sweet-grass | 126 | 2013 |
| plant | Glyceria fluitans | Floating Sweet-grass | 1074 | 2023 |
| plant | Glyceria fluitans x notata = G. x pedicellata | Hybrid Sweet-grass | 20 | 2006 |
| plant | Glyceria maxima | Reed Sweet-grass | 648 | 2024 |
| plant | Glyceria notata | Plicate Sweet-grass | 547 | 2023 |
| plant | Glycine max | Soya-bean | 3 | 1930 |
| plant | Gnaphalium uliginosum | Marsh Cudweed | 233 | 2024 |
| plant | Gossypium hirsutum | Upland Cotton | 3 | 1938 |
| plant | Grindelia squarrosa | Curlycup Gumweed | 1 | 1922 |
| plant | Griselinia littoralis | New Zealand Broadleaf | 30 | 2015 |
| plant | Groenlandia densa | Opposite-leaved Pondweed | 83 | 2012 |
| plant | Guizotia abyssinica | Niger | 17 | 2022 |
| plant | Gunnera | a giant rhubarb (unidentified) | 3 | 2018 |
| plant | Gunnera tinctoria | Giant Rhubarb | 3 | 2014 |
| plant | Gymnadenia conopsea | Fragrant Orchid | 68 | 2017 |
| plant | Gymnadenia densiflora | Marsh Fragrant-orchid | 2 | 2006 |
| plant | Gymnocarpium dryopteris | Oak Fern | 1 | 1834 |
| plant | Gymnocarpium robertianum | Limestone Fern | 16 | 2012 |
| plant | Gymnocladus dioicus | Kentucky Coffee Tree | 1 | 2015 |
| plant | Gymnospermae | Gymnosperm | 3 | 2022 |
| plant | Gypsophila muralis | Annual Gypsophila | 1 | 1931 |
| sea-fan, sea anemone or jellyfish | Gonothyraea loveni | a Sea-fan/Sea Anemone/Jellyfish | 1 | 1937 |
| spider | Gibbaranea gibbosa | an orb-weaver spider | 8 | 2019 |
| spider | Gnathonarium dentatum | a money spider | 8 | 1999 |
| spider | Gonatium rubens | a money spider | 6 | 1987 |
| spider | Gongylidiellum vivum | a money spider | 3 | 2019 |
| spider | Gongylidium rufipes | a money spider | 3 | 1987 |
| tick or mite (acarine) | Gamasellus inermis | a mite | 1 | 1936 |
| true fly - | Gastrolepta anthracina | a parasitic fly | 4 | 2018 |
| true fly - | Geomyza balachowskyi | a fly | 4 | 2009 |
| true fly - | Geomyza subnigra | a fly | 2 | 2023 |
| true fly - | Geomyza tripunctata | a fly | 24 | 2023 |
| true fly - | Gigalimosina flaviceps | a lesser dung fly | 3 | 2020 |
| true fly - | Gonia divisa | a parasitic fly | 1 | 2013 |
| true fly - | Gonia picea | a parasitic fly | 2 | 2020 |
| true fly - | Goniocera versicolor | a parasitic fly | 1 | 1997 |
| true fly - | Graphogaster brunnescens | a parasitic fly | 1 | 1948 |
| true fly - | Graphomya maculata | a muscid fly | 17 | 2023 |
| true fly - | Gymnocheta viridis | a parasitic fly | 17 | 2023 |
| true fly - bot fly | Gasterophilus intestinalis | Horse Bot Fly | 1 | 2005 |
| true fly - cranefly | Gonomyia abbreviata | a cranefly | 1 | 2006 |
| true fly - (diptera) | Geranomyia unicolor | an insect - true fly (Diptera) | 2 | 2022 |
| true fly - (diptera) | Gymnoclasiopa plumosa | an insect - true fly (Diptera) | 1 | 2009 |
| true fly - (diptera) | Gymnomus caesius | an insect - true fly (Diptera) | 2 | 2003 |
| true fly - midge, gnat or mosquito | Geocrypta galii | a gall midge | 7 | 2001 |
| true fly - picture-winged, conopid or stilt-legged fly | Goniglossum wiedemanni | a gall fly | 3 | 2000 |
| true fly - robber, empid or dolichopid fly | Gymnopternus aerosus | a dolichopodid fly | 4 | 2001 |
| true fly - robber, empid or dolichopid fly | Gymnopternus assimilis | a dolichopodid fly | 1 | 2000 |
| true fly - robber, empid or dolichopid fly | Gymnopternus cupreus | a dolichopodid fly | 4 | 1999 |
| true fly - robber, empid or dolichopid fly | Gymnopternus metallicus | a dolichopodid fly | 1 | 1999 |