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

Polypores and Corticoids - brackets and crusts

This section includes many of the fungi that grow on the trunks, branches and stumps of trees.  Often the species of tree on which they are growing - including dead wood - is an aid to identification.  Almost all are decomposers of wood, causing white or brown rot.  

Polypores release spores through downward pointing tubes on fertile surface.  Pores can be labyrinthine (maze-like - see Oak Mazegill), circular, angular (e.g. Alder Bracket), elongated (e.g. Lumpy Bracket) or stretched and gill-like; always examine and photograph the pore layer.  The number of pores per millimetre can be an important feature (use a transparent rule and hand lens).  Some pore surfaces stain when bruised.   Polypores can be perennial or annual; perennials e.g Artist's Bracket have several tube layers and often have zonate caps and hard or tough fruitbodies; annuals can be soft or tough and leathery.  Polypores can have several different growth forms:

• Capped - a shelf/bracket or hoof-like form with a distinct cap on upper surface and a fertile surface with pores underneath e.g. Blushing Bracket or Hoof Fungus
• Resupinate – a flattened fruitbody without a cap, appressed to the substrate (e.g. Rusty Porecrust);  
• Reflexed – partly resupinate, partly capped, with part of the fruit body bent back to form a bracket-like cap. e.g. Smoky Bracket;
• Clustered or fasciculate - numerous caps from a narrow common base or short thick stem e.g. Chicken-of-the-Woods, Dyer's Mazegill. 
• Stemmed - tongue shaped with lateral stem attached to substrate (e.g. Birch Polypore or Dryad's Saddle), or with a central or acentric stem (e.g Winter Polypore and Bay Polpore). The latter may be superficially similar to Boletes, but polypore tubes cannot be separated from the cap flesh, unlike boletes

Corticoids do not have pores on the fertile surface and are usually resupinate or reflexed but may also be mould-like or fragile and loosely attached.  Always photograph the fertile layer as well as the cap of reflexed forms. Some fertile surfaces stain when bruised e.g. Bleeding Oak Crust. The fertile surfaces can be wrinkled (merulioid) e.g. Wrinkled Crust or Netted Crust; smooth e.g. Hairy Curtain Crust, spiny or toothed e.g. Toothed Crust, gill-like e.g. Crimped Gill, or warty.  Most are annual.    Identification of many species is very difficult, and we have only illustrated a small number of UK species below.  Microscopic examination by an expert will be needed to identify some. 

Meruliaceae - Resupinate/reflexed with wrinkled surface

These species do not have pores; instead the fertile surface or hymenophore has a wrinkled surface.  They are often called 'merulioid' crusts.  The Netted Crust (Byssomerulius corium) also has a wrinkled surface but is in a different family.