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

Powdery mildews (Erysiphaceae)

Powdery mildews are ascomycetes, existing in two different states.  In the asexual 'anamorph' state reproduction is via the whitish conidia, borne on conidiophores on leaves, stems or fruits.   In the sexual 'teleomorph' state reproduction is via ascospores produced in asci within chasmothecia, which form later in the year and are visible as tiny brown or black specks in the mycelium on the leaf underside.  The chasmothecia are more or less spherical bodies that have hair-like appendages when mature.  The shape of the appendages assists identification - they may be straight, branched, forked, hooked, flexuous, coiled etc. 

With the exception of a few Podosphaera species, powdery mildews are not gall-causers.

Many species are specific to a single host-plant or small range of hosts, so identification should always start by accurate identification of the affected plant.   

Species concepts are changing all the time.  The trend is towards splitting a species into several new species with different host relationships, with a tendency for the newly described species to be more specific with regard to hosts - often to a single genus, species or small range of hosts.  Often these new species concepts are described in scientific literature and are not very accessible to the amateur naturalist or recorder.  In the gallery below, we have followed the recent (and accessible) guide by Woods, R.G. et al  (2024) with regard to host-plants.  In this context of change, it is even more important to identify and note host species and describe microscopic characteristics of either anamorph (asexual state, with conidia) or telemorph state (sexual, with chasmosthecia and asci). 

Woods, R.G., Chater, A.O., Evans, D.A., Smith, P.A. & Stringer, R.N. (2024). The Powdery  Mildews (Erysiphales) of Britain and Ireland ‐ an Identification Guide and Census Catalogue for  Wales. A.O. Chater, Aberystwyth. This is an excellent guide to these species - download from Aber University website. 

Microphotos of many species are on BioImages websitre https://www.bioimages.org.uk/html/Erysiphales.htm 

Erysiphaceae