Scientific name: Coprinellus radians (Desm.) Vilgalys,
Hopple & Jacq. Johnson
Derivation of name: Radians means either 1) with rays or
spokes or 2) radiant.
Synonyms: Coprinus radians (Desm.) Fr.
Common name(s): Orange-mat coprinus
Occurrence on wood substrate: Saprobic; single or scattered
or in small groups on wet wood; May through October.
Dimensions: Caps 2-3 cm wide; stipes 2.5-7.5 cm tall and
Cap: Tawny-brown to yellowish-orange; covered with
evanescent, brownish mealy particles.
Gills: Attached or almost free; white, becoming black and
Spore print: Black.
Stipe: White, fragile, hollow and arising from a mat of yellow-
orange mycelium on top of the wood.
Veil: Universal veil breaking up as mealy particles (scales) on
Comments: This species is found not only outdoors on wet
and rotting wood but also indoors on wet wood in basements
and bathrooms. Sometimes the orange mycelium is found
without the fruitbody. DNA studies (see Redhead, S. A., et al.
2001) radically revised the taxonomy of Coprinus. The
genus Coprinus was divided into several new genera
and the family Coprinaceae no longer exists.
Figure 1. Note the distinctive orange mat of mycelium.
Photo © John Plischke III.