Fungi


Generally  you see only the spore-producing structure (or fruitbody) of a fungus, the rest being well hidden (e.g. in soil, dung or wood). On Nature Map, fungi are divided into categories (the groups and sub-groups shown on the right) based on fruitbody form. Each category name consists of a descriptive phrase and this may be followed:

           in square brackets  ]      by a colloquial name

 or     in angled brackets  >      by a technical term

for what you find in that category. Some examples of colloquial terms are mushroom, bolete and polypore – and these are some of the traditional groupings, that have long been used in fungal field guides aimed at the general public.

Why not use just the colloquial terms as category names?

Mushroom is a word that many people are familiar with but it is used in different ways. Mostly it denotes something fleshy with cap, gills and stem (and that will be the meaning in these notes) but some people add the extra condition that a mushroom must be edible (anything else is a toadstool) and some use it virtually as a synonym of fungus. Experience has shown that other traditional terms (e.g. bolete, polypore) are meaningless to people who have never read anything about fungi. The brief explanations in the category names tell users who are unfamiliar with fungi what sorts of fruiting bodies they’ll find in a given category. Note also that some groups of fungi don’t have well-established colloquial names. 

If you click on a category you will see an Overview for it. While the category names help, they must necessarily be short and, to get the most benefit, you should read the Overviews. An Overview may (via Hints) offer more detail about the visual or non-visual features that would help identify your sighting or give some Warnings.

The fungi in a given category need not be closely related and the only aim of this categorization is to help you place your sighting. Many users are likely to take photos of fungi incidentally, without necessarily studying the fungi closely, and so would need to rely on just the photograph when trying to place a sighting.  For that reason the categories rely on visual features as far as possible to make it easier for those with no knowledge about fungi. The terms in square brackets aim to help those with some knowledge of fungi  and even the more knowledgeable users may find more help within the angled brackets.

How to search

If you are unfamiliar with fungi it is best to start at the top of the list on the right and work your way down until you find something that describes your sighting. First are the Cap on a stem groups. In these the top of the fruitbody is sharply differentiated from a supporting stem. In some fungi the fruit body tapers gradually from a broad apex, but with no such sharp differentiation, hence no proper stem (but a pseudo-stem) and such fungi are not included. On past experience, most fungal sightings will be of mushrooms and they are in the first group.

Why do some genera appear in more than one category?

Long ago, fungal classification was closely tied to fruitbody form but later research showed that closely related species need not have the same fruitbody form. Mostly, all species in a genus have the same form of fruitbody but there are exceptions. As an example, look at these two: Schizophyllum amplum  and Schizpophylum commune .

This means that in any categorization based only on macroscopic features there will inevitably be cases where all the species of a genus do not fit into the one category. There are a few instances where it is more sensible to deal with slightly dissimilar fruitbody types together and so though your sighting has a fruitbody that should be in category X, a note there will direct you to category Y.

Use of formal taxonomic categories (e.g. genera, families or orders) would avoid the splitting of genera but such categories would not be easy for a non-expert to use since many such categories rely on microscopic features. Also, dissimilar fruitbodies may be grouped together (as Schizophyllum shows) and two species, with fruitbodies of similar form, may fall into different taxonomic categories.

Warnings

The grouping is based on mature fruitbodies and immature fruitbodies may look different.

Many fungi are not identifiable from photos, no matter how good.

With age frutibodies may become tattered, dowdy and unidentifiable from a photo.

More information

For more about fungi in general see: http://www.cpbr.gov.au/fungi/index.html  

     .....For more about fruitbody types see: http://www.cpbr.gov.au/fungi/types-of-fungi.html  

     .....For more about macroscopic features see: http://www.cpbr.gov.au/fungi/macroscopic.html

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Discussion

Heinol wrote:
22 Jan 2026
A Nordic fungal monograph includes the rarely found, yellowish species Tricholomopsis ossiliensis, that keys out in a final couplet alongside decora. That monograph allows five levels of gill spacing – very crowded, crowded, medium spaced, distant, very distant. In both species the gills are described as medium spaced and, for ossiliensis they are noted as adnate or with a short decurrent tooth. These two species are reported on decaying conifer wood and (according to GBIF, with the cf. decora of Tasmania and some environmental DNA from Thailand excluded) they have been reported only from the Northern Hemisphere. So, while I don’t think this is decora, the visual similarity prompted ‘decora group’ as a reasonable pigeonhole. I looked through NatureMapr’s unidentified agarics to see if there were any more sightings of this but didn’t find any.

Tricholomopsis 'decora group'
KenT wrote:
21 Jan 2026
With the Gates & Ratkowsky images of Tricholomopsis neither of their species show widely spaced decurrent gills that are present in the images presented here. I don't know how much weight the old physical characters have in generic and species determination in these times of modern molecular identification.

Tricholomopsis 'decora group'
Heinol wrote:
21 Jan 2026
Given the large size and the excentric stem I had assumed Pleurotus and, until yesterday, had not thought about it nor looked any further at it after collecting the specimens. The microscope showed this fungus to have colourless, warty spores – so not a species of Pleurotus. Lepista – or something closely related.

Lepista sp.
Heinol wrote:
21 Jan 2026
I've since seen that the Tasmanian fungal guide by Gates & Ratkowsky includes a photo of a Tricholomopsis that they label 'cf. decora'.

Tricholomopsis 'decora group'
Heinol wrote:
15 Jan 2026
Intriguing. I think this is something akin to the northern hemisphere species Tricholomopsis decora (e.g. see https://www.mushroomexpert.com/tricholomopsis_decora.html for a description).

It would probably be more interesting if this were a species of Desarmillaria - basically a ringless Armillaria and a genus in which the caps can be small. It is widespread in the northern hemisphere and I know of only one claim of it in Australia – a 1989 collection from Queensland and stored under the name Armillaria tabescens in the Brisbane herbarium (see https://avh.ala.org.au/occurrences/f536f6ff-e680-4400-bf36-4da21a91ad47) – and your photos don’t show that species, nor any other Desarmillaria species that I can find photos/descriptions of.

Tricholomopsis 'decora group'
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