Fungi

Fungi are not plants, as was thought to be so in the past, but in a separate Kingdom of their own.  In most cases, the main body of the fungus is hidden from view.  It is a network of threads (hyphae) collectively called a 'mycelium', which permeate the substrate on which the fungus grows.  The hyphae absorb nutrients and water from the substrate.  The reproductive spore-producing structures, such as the familiar mushroom or bracket, are the visible parts of the fungus. 

The Fungus Kingdom is extremely diverse, and includes many microfungi that are rarely recorded.  Most of the larger species are in one of two major divisions or Phylum, based on the way the fungus reproduces.  Basidiomycota (sometimes called 'spore-droppers') include mushrooms and toadstools, brackets, corals, puffballs, jellies, rusts and smuts. The Ascomycota or 'spore-shooters' includes cups, morels, yeasts and many other smaller fungi.  

Taxonomy is very complicated and is liable to change as the true relationships between species are worked out.  In the sections below, we have grouped fungi into categories based on their structure and appearance rather than their place in the scientific taxonomic hierarchy.  There is more information under each section.

Recording fungi

Always note the substrate or host-plant on which the fungus is growing, and the habitat.  To identify many large species, it is helpful to get a good photograph of the cap (from the top), the gills or spore-producing structures (from underneath) and the stipe or stem (from the side) - three images from three angles, rather than images from much the same angle. 

Always note the texture of cap and stipe; the smell; and the presence of any staining or 'milk' produced when the cap, gills, stipe or body of the fungus is bruised. 

The colour of the spores can be very helpful.  It is best seen by taking a spore-print from a collected specimen - advice on doing this is in many of the resources below.  For some fungi, microscopic examination of the spores may be needed for identification.

Resources

The Leicestershire Fungi Study Group is a great place to start if you want to learn about fungi. They welcome new members. Their annual programme of study forays is led by enthusiastic and knowledgeable leaders. There are also indoor microscopy sessions held in Leicester. This is a really excellent way to broaden your knowledge, and make friends who share your interest in fungi.

There are many field guides, but none of them contain all the fungi you will find, or have all the photos or information you need, so it is a good idea to check several different books and websites. 

• Kibby, G. 2020-2022. Mushrooms and Toadstools of Britain & Europe, Volumes 1 - 4. (privately published)
• Laessoe,T. & Petersen,J. (2019)  Fungi of Temperate Europe. Princeton University Press, Volumes 1 and 2
• O'Reilly, P. (2016). Fascinated by Fungi. First Nature
• Sterry, P. & Hughes, B.  (2009). Complete guide to British Mushrooms and Toadstools.  Collins
• Wood, E & Dunkelman, J.  (2017).  Grassland Fungi: a Field Guide.  Monmouthshire Meadows Group

Useful websites include Pat O'Reilly's First Nature website,  the Buckinghamshire Fungus Group, the Hampshire Fungus Recording Group and Fungi Outer Hebrides. 

The British Mycological Society website is a good source of information, mostly aimed at the expert. 

If you know of other websites or books that you would recommend, do let us know: info@naturespot.org

Agarics and other fungi with caps and gills

In this section are most of the commonly recorded 'mushrooms and toadstools' with spore bearing gills underneath the cap.  Most of these are Agarics and related species, but we have included some families that have caps and gills but are unrelated - e.g. the Russulaceae. 

For most species, the spores fall from the gills and are dispersed by the wind.  Spore colour is an important way of identifying species and it may be necessary to take a spore print from a collected specimen.  As well as noting the colour, smell, texture, milk/staining, habitat and substrate, also note:

• the way the gills are attached to the stem or stipe; cutting vertically through the cap and stipe will help to see this (some examples are here: decurrent; adnate; adnexed/free)
• the colour of the gill edges (example: velvet shield)
• whether there is a ring around the stipe (some examples: wood mushroom;  porcelain fungus)
• whether there is a volva or sac at the base of the stipe (example: false death-cap)
• whether there is a veil or the remains of one under the cap. (example: birch web-cap

Tricholomataceae - Knights, Cavaliers, Funnels, Blewits, etc.

A large family that includes the following important genus - at least currently (2026); it may be subject to change:

Funnels (Clitocybe and Infundibulicybe) have white or cream or pinkish-clay spore-prints.  It can assist identification to take a print from a specimen; spore size may also be important. Not all are funnel shaped but when mature usually have a depressed centre and gills that are decurrent, sometimes strongly so.  Smell should also be noted; e.g. some smell farinaceous (i.e. floury); others have sweet, spicy or aniseed smells.  In the gallery below, and exclamation mark after the camera icon indicates that a spore-print will be helpful or that a distinctive smell should be noted. 

Blewits (Lepista) are medium to large fungi, most with pinkish or brownish-pink warty spores, and often with violet or lilac tones and a pleasant flowery scent.

Cavaliers (Melanoleuca) are a large and difficult genus, mostly with flattened or umbonate caps and white warty spores.

Knights (Tricholoma) are another large and difficult genus.  They have white smooth spores and usually have emarginate gills; some have a fine veil, the remains of which can persist as a ring on the stipe.  It is always helpful to sniff the fresh specimens; some have distinctive (or no) smells.

In the galleries below, an exclamation mark after the red or amber camera icon means that microscopic examination or information on smell, taste, texture or another factor is needed.

[NB: We have included the Funnels and Blewits (Clitocybe, Infundibulicybe, Lepista and other related species) here because they are placed in Tricholomataceae on the BMS GB checklist - however, these species are currently 'Incertae sedis' in the Agaricales on the NBN (i.e. not assigned to any Family).  A separate family, Clitocybaceae, is widely used, as on CABI database.]   

Tubariaceae - Twiglets