Great Britain is home to thousands of species of fungi, many of which are very rarely collected, and doubtless there are many more that remain to be discovered. Many fungi can be identified by examination with the naked eye, most cannot, and a microscope is needed. Even when microscopy is not essential, use of the microscope can help corroborate an identification based on macroscopic features.
A fruiting body should be examined at the time of collection and notes taken as the colours, and smells, often change after picking, especially if the specimen is bruised during transport. Specimens that are to be taken back home can be stored in small containers, with similar specimens kept in separate containers and labelled to prevent confusion. A tool box from a DIY store such as B&Q is ideal for carrying specimens, a loupe, a notebook, and a packed lunch.
The following details should be recorded at the time of collection:
A photograph provides a permanent record of the fungus. Ideally a dedicated camera and macro lens mounted on a tripod should be used, but even a smart phone with a built in camera may suffice.
The colour of a spore print will quickly eliminate many potential genera. A spore print may be taken by placing the specimen on a piece of paper or a microscope slide, and leaving it overnight to ensure a good spore drop.
The following sections present some simple keys which should help you on the path to the identification of an unknown species of fungus.
One problem the amateur will face is that he/she may have no more than one or two popular guides which will cover a limited number of species, and quite often the descriptions are rather brief. Few popular works cover more than 1,000 species, whereas more than 2,500 macrofungi are known to exist in the UK. Some amateur mycologists spend a small fortune on specialist works, many of which cost the best part of £100 each. There are many online forums and Facebook pages with people who can provide help, and point you to useful online resources. Be careful of online images as many are incorrectly identified.
The following table is a simple key to the genera listed in the A to Z. It is not intended to be authoritative or complete, and excludes many rare genera.
Cup Fungi Cup shaped, on soil, wood, organic debris and dung. |
Aleuria, Anthracobia, Bisporella, Cheilymenia, Chlorociboria, Ciboria, Disciotis, Geopora, Humaria, Melastiza, Octospora, Otidea, Paxina, Peziza, Rutstroemia, Sarcoscypha, Scutellinia, Tazzetta. |
Puff Balls and Stalked Puff Balls Round or club shaped, mostly on soil, some on wood. At maturity the paper thin skin ruptures, to allow the dust like spores to emerge, often through a narrow aperture. |
Battarraea, Bovista, Calvatia, Handkea, Lycoperdon, Tulostoma, Vascellum. |
Earth Balls, and Tubers A group of mostly ball shaped fungi, which at maturity break open to release the powdery spore mass. |
Rhizopogon, Scleroderma. |
Earth stars Fungi consisting of a ball on star shaped arms. |
Geastrum, Astraeus, Myriostoma. |
Subterraneum Fungi Fungi which grow beneath the soil surface. |
Elaphomyces, Tuber |
Tooth or Spine Fungi Fungi whose underside is covered with spine-like protuberances. |
Auriscalpium, Bankera, Hericium, Hydnellum, Hydnum, Sarcodon, Phellodon. |
Trumpet Fungi Trumpet shaped fungi, with soft flesh, usually growing on soil. |
Cantharellus, Craterellus, Pseudocraterellus. |
Spindle and Club Fungi Fungi with club shapes, either slender, or robust, usually growing on soil. |
Clavaria, Clavariadelphus, Clavulinopsis, Cordyceps, Macrotyphula, Typhula. |
Earth Tongues Small upright tongue-like fungi, growing in grass. |
Geoglossum, Microglossum, Trichoglossum. |
Coral Fungi Coral-like fungi with soft to firm flesh, growing on soil or wood. |
Clavaria, Clavulina, Clavulinopsis, Ramaria, Phaeoclavulina, Sparassis, Thelephora |
Jelly Fungi Fungi with a gelatinous texture. Often brightly coloured and always growing on wood. |
Ascocoryne, Auricularia, Bulgaria, Calocera, Cudoniella, Dacrymyces, Exidia, Guepinia, Myxarium, Neobulgaria, Pseudohydnum, Tremella. |
Stinkhorns Phallus like fungi with a tip covered in a foul smelling spore mass. |
Dictyophora, Mutinus, Phallus. |
Birds Nests Small cups or nests containing small egg-like spore packets, growing on organic debris. |
Crucibulum, Cyathus, Nidularia, Sphaerobolus. |
Brain fungi Fungi consisting of a brain like cap on a stem. |
Gyromitra, Morchella, Verpa. |
Elfin Saddles Fungi consisting of an irregular cap on a stem. |
Cyathipodia, Helvella. |
Fleshy Brackets Bracket like fungi, with soft flesh, and gills, with a lateral or absent stem, growing on living trees, dead wood and organic debris. |
Arrhenia, Crepidotus, Hohenbuehelia, Lentinellus, Omphalotus, Ossicaulis, Panellus, Pleurocybella, Pleurotus, Schizophyllum. |
Succulent Brackets Bracket like fungi, with firm but not corky flesh, and pores on the under surface, growing on living trees and dead wood. |
Abortiporus, Grifola, Hepatica, Inonotus, Laetiporus, Meripilus, Polyporus, Postia. |
Hard brackets Bracket like fungi, with leathery or corky flesh, growing on living trees, and dead wood. |
Antrodia, Daedalia, Daedaliopsis, Datronia, Fomes, Fomitopsis, Ganoderma, Gloeophyllum, Heterobasidium, Inonotus, Ischnoderma, Oxyporus, Phaeolus, Phellinus, Piptoporus, Polyporus, Pyncnoporus, Trametes. |
Crusts Fungi forming a mat like layer on a substrate, usually wood. |
Antrodia, Coniophora, Peniophora, Phellinus, Phlebia, Schizopora, Serpula, Stereum, Ustulina. |
Boletes Small to large fungi having a cap and a stem, and sponge like pores on the underside of the cap. Always associated with a tree or shrub. |
Aureoboletus, Boletus, Butyriboletus, Caloboletus, Gyrodon, Gyroporus, Imleria, Imperator, Leccinum, Neoboletus, Porphyrellus, Pseudoboletus, Rubroboletus, Strobilomyces, Suillus, Tylopilus, Xerocomus, |
Gilled Mushrooms with volva Mushrooms with a cap, gills and central stem, with a fleshy sack at the stem base. |
Amanita, Volvariella. |
Gilled Mushrooms without volva Mushrooms with a cap, gills and central stem, with no fleshy sack at the stem base. |
Agaricus, Agrocybe, Armillaria, Bolbitious, Cantharellula, Clitocybe, Clitopilus, Collybia, Conocybe, Coprinus, Cortinarius, Cystolepiota, Entoloma, Flammulina, Gymnopilus, Hebeloma, Hygrocybe, Hygrophoropsis, Hypholoma, Inocybe, Kuehneromyces, Laccaria, Lepiota, Lepista, Leucocoprinus, Leucopaxillus, Limacella, Lyophyllum, Macrolepiota, Marasmius, Melanoleuca, Melanophyllum, Mycena, Naucoria, Omphalotus, Oudemansiella, Panaeolus, Paxillus, Phaeolepiota, Pholiota, Pluteus, Psathyrella, Pseudoclitocybe, Psilocybe, Rhodocybe, Rickenella, Russula, Stropharia, Tapinella, Tephrocybe, Tricholoma, Tricholomopsis, Tubaria |
The following table lists the spore print colour against genus. Note that spore colour may vary within each genus. The table excludes many rare genera.
Spore print | Species |
White, whitish or cream | Amanita, Armillaria, Arrhenia, Cantharellula, Clitocybe, Collybia, Cystolepiota, Flammulina, Gliophorus, Hygrocybe, Hygrophoropsis, Laccaria, Lepiota, Leucocoprinus, Leucopaxillus, Limacella, Lyophyllum, Macrolepiota, Marasmius, Melanoleuca, Mycena, Omphalotus, Oudemansiella, Panellus, Panus, Pleurotus, Pseudoclitocybe, Rickenella, Russula, Tephrocybe, Tricholoma, Tricholomopsis |
Yellow | Russula |
Pale ochre to ochre | Lactarius, Russula, Tubaria |
Cream with salmon tinge | Lactarius |
Lilac | Pleurotus, |
Rust-brown or rust | Bolbitious, Conocybe, Cortinarius, Galerina, Gymnopilus, Hypholoma, Kuehneromyces, Paxillus, Pholiota, Tapinella |
Brownish | Agaricus, Agrocybe, Crepidotus, Hebeloma, Hypholoma, Inocybe, Naucoria, Phaeolepiota, Psathyrella, Psilocybe, Stropharia |
Purple-brown | Hypholoma, Psathyrella, Psilocybe, |
Black, purple-black or brown-black | Coprinus, Panaeolus, Parasola, Psathyrella |
Greenish | Chlorophyllum, Melanophyllum, Phylloporus |
Reddish | Melanophyllum |
Pink | Entoloma, Clitopilus, Lepista, Pluteus, Rhodocybe, Rhodotus, Volvariella, |
The following table lists major genera of gilled mushrooms.
Genus | Comments |
Wax Caps, Gliophorus, Hygrocybe |
Small to medium sized mushrooms, often brightly coloured, and often found in unimproved grasslands. The texture of the surface - e.g. dry or greasy - can be significant in identifying a specimen. |
Milk Caps, Lactarius |
A large genus, of medium to large mushrooms, with flattened or funnel shaped caps, and a ringless stem, producing a milk or sap on cutting the flesh. Some have milk or flesh which undergoes a slow to rapid colour change on exposure to the air, though the change may take several minutes. It is worth dabbing some milk on a white handkerchief, and waiting several minutes to observe any colour change. Always associated with trees and/or shrubs. |
Russula |
A very large genus of medium to large mushrooms, usually with brittle white flesh and a ringless stem. The caps are often brightly coloured. Always associated with trees and/or shrubs. This is an extremely difficult genus. In many cases an identification cannot be reached without microscopic examination and chemical tests. |
Mycena |
A large genus of very small to medium sized saprotrophic (decomposing dead organic matter) mushrooms, usually slender in form, with conical caps, a ringless stem, and thin flesh. Some produce a coloured milk on cutting the stem. Many have distinctive smells, which can be amplified by placing specimens in a small container for a period of time. |
Pholiota |
A modest genus of medium to large sized mushrooms, sometimes with a ring on the stem, with smooth, sticky or scaly caps, and growing on wood and woody debris. The spores are brown to rusty-brown. |
Ink Caps, Coprinus |
A large genus of fungi, usually with rather fragile flesh. The gills gradually turn to a black liquid, hence the common name. Many grow on animal dung. |
Brittle Stems, Psathyrella |
A large group of fungi with brittle flesh, usually with a slender form, whitish stems, usually ringless, and producing dark brown spores. |
Web Caps, Cortinarius |
The largest genus, containing a huge range of forms. All have a transient cob web like veil between the cap margin and stem, though it may persist as little more than faint markings on the stem apex. Always associated with trees and/or shrubs such as Common Rock Rose. Many have unusual smells and tastes, and distinctive shapes, especially the stem base. Young specimens often show violaceous tones in the gills and flesh which disappear with age. |
Amanita |
A fairly large genus of fungi which emerge from a fleshy sack, which often persists as white or grey spots or patches on the cap surface, and sometimes as a volva, or sack, at the base of the stem. Many have rings on the stem. Take care to note the colour of the veil remnants on the cap. Some have strong smells. Always associated with trees and/or shrubs. |
Pluteus |
A modest group of fungi with pink gills at maturity, and a ringless stem. Most grow on dead wood, and many are quite large and very common. The gills are free. |
Lepiota and Macrolepiota |
A large group of small to very large fungi with white, off-white or pale yellow gills, a ring or faint ring zone on the stem, and a cap that is often very scaly. All grow on soil, or organic debris such as compost heaps. Many have distinctive smells, ranging from nutty to nauseaous. The Macrolepiota genus includes the Parasol Mushroom. |
Entoloma |
A very large genus of pink gilled mushrooms with a ringless stem. Most grow on soil, though some grow on dead wood. Microscopically Entoloma are recognised by distinctly faceted spores. Always associated with trees and/or shrubs. |
Fibre Caps, Inocybe |
A large group of small to medium sized mushrooms, usually with fibrous caps, ringless stems, and brown spores. Always associated with trees and/or shrubs. Most grow on soil, though some grow on dead wood, or organic matter. Some have distinctively knobbly spores. This is a difficult genus, which inspires fear in the hearts of many amateur mycologists. |
Knight Caps, Tricholoma |
A large genus of medium to large fungi, with (apart from two exceptions) a ringless stem, firm flesh, sinuate gills, and growing on soil. They are always associated with trees and/or shrubs. Note the smell and taste of the flesh, which sometimes reveals distinctive features after chewing for several minutes. (Never taste any mushroom unless you are sure it is safe to do so.) |
Collybia |
A large genus of medium to large saprotrophic (decomposing dead organic matter) mushrooms, usually with non-decurrent gills, a ringless stem, and with whitish to pale pink spores. |
Funnel Caps, Clitocybe |
A large genus of small to large mushrooms, with depressed or funnel shaped caps, decurrent gills, a ringless stem and whitish spores. |
Lepista |
A genus of saprophytic (living on dead organic matter) medium to large mushrooms with flattened to funnel shaped caps, a ringless stem, and white to pale pink spores. |
Agaricus |
A fairly large genus of medium to large saprotrophic (decomposing dead organic matter) mushrooms, usually with whitish caps, brown or pink gills, and a whitish stem with a ring. The whitish flesh often stains red, pink or yellow on bruising. Found on soil, compost heaps, and well rotted manure. Includes several commonly cutivated species, as well as many that are widely collected for the table. |