The Families of Mushrooms and Toadstools Represented in the British Isles


L. Watson and M. J. Dallwitz


~ Boletaceae, Gyrodontaceae p.p.

Morphology. The fruit-bodies producing basidia and basidiospores; ephemeral; solitary; differentiated into a stipe and pileus with the hymenium underneath the latter (dry boletoids, distinguished by the stipe becoming cavernous); medium sized to large; in Gyroporus cyanescens, 5–10 cm across. The mature pileus convex. The top of the pileus in G. cyanescens, yellowish-brown and light brown. The fruit-bodies reacting rapidly with a marked colour change when cut or bruised, or showing no conspicuous colour reaction to cutting or bruising; damaged flesh of Gyroporus cyanescens turning blue. The stipe with neither ring nor volva; developing cavities at maturity. The hymenium porose. The hymenial layer readily separable from the supporting flesh. The hymenium not thickening. The hymenophore free to adnexed. The hymenophoral trama bilateral. The basidia ‘unmodified’. The basidiospores short, subglobose to ellipsoid, lacking a sub-hilar depression; ballistosporic; brown; smooth, or ornamented (smooth or ridged?).

The hyphae with clamp connections (Gyrodon), or without 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. Spaerocysts not occurring among the context hyphae.

Chemical reactions. Not yielding prenylated phenols and quinones.

Ecology. The fruit-bodies borne on the ground.

British representation. 3 species in Britain; Gyroporus, Rubinoboletus.

World representation. 20 species; genera 2. “Widespread”.

Classification. Basidiomycota; Basidiomycetes; Agaricomycetidae; Boletales.

Comments. G. cyanescens edible (and good).

Illustrations. • Gyroporus cyanescens (LH).

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.’.