The Families of Mushrooms and Toadstools Represented in the British Isles


L. Watson and M. J. Dallwitz


Anamorphic forms of Sistotrema occurring (involving 4 generic names).

Morphology. The fruit-bodies producing basidia and basidiospores; persistent; differentiated into a stipe and pileus with the hymenium underneath the latter, or attached laterally and bracket-shaped, or flattened and more or less appressed to the substrate or encrusting, with the hymenium on the outside (resupinate to pileate). The hymenium with pegs or spinose (spinose), or smooth. The hymenial layer not readily separable from the supporting flesh. The hymenium not thickening. Cystidia absent. The basidia ‘unmodified’ (urniform); not of the ceratobasidialean type (q.v.); 4-sterigmate, or 5–8 sterigmate (4–6–8). The basidiospores ballistosporic; hyaline; smooth; inamyloid.

The hyphae with clamp connections. The hyphal walls lamellate, with a thin, electron-dense outer layer and a relatively thick, electron-transparent inner layer. The hyphae monomitic. The generative hyphae inflated (at the septa, loosely arranged). The context hyphae not exhibiting distinctive right-angled branching (unlike those of Botryobasidiaceae); loosely arranged and inflated at the septa (and loosely arranged).

Chemical reactions. The context hyphae not xanthochroic.

Ecology. The fruit-bodies not subterranean.

British representation. About 60 species in Britain; Fibriciellum, Paullicorticium, Repetobasidiellum, Repetobasidium, Sistotrema, Systotremastrum, Systotremella, Trechispora.

World representation. 120 species; genera 8. “Widespread”.

Classification. Basidiomycota; Basidiomycetes; Agaricomycetidae; Polyporales (formerly Stereales).

Comments. The basidia urniform, 2–12 sterigmate.

Illustrations. • Sistotrema confluens, S. raduloides and Trechispora cohaerens (Læssøe & Petersens).

To view the illustrations with captions giving names in current use, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, distributions of character states within any set of taxa, source references, and other relevant material.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2008 onwards. The families of mushrooms and toadstools represented in the British Isles. Version: 6th March 2015.’.