Psathyrella rugocephala

Scientific name:  Psathyrella rugocephala (G. F. Atk.)
A. H. Smith
Derivation of name:  Rug- means "wrinkle" and cephal-
means "head." Rugocephala aptly describes the cap of this
SynonymsHypholoma rugocephalum G. F. Atk.  
Common name(s):  Corrugated-cap Psathyrella.
Phylum:   Basidiomycota
Order:   Agaricales
Family:   Psathyrellaceae
Occurrence on wood substrate:  Saprobic; scattered or in
groups on and around decaying deciduous wood; July through
Dimensions:  Caps 5-10 cm wide; stipes 7.5-12.5 cm long and
0.5-1 cm thick.   
Cap: Brownish to rusty brown, fading to tannish; surface
coarsely radially wrinkled.  
Gills: Attached; whitish, becoming purplish-brown to black at
Spore print: Purple-brown.
Stipe: Whitish, darkening to brownish below with white
mycelium at the base.
Veil: Fibrillose-membranous, not leaving a ring.
Edibility: Edible but not recommended due to difficulties in
Comments: Macroscopically, Psathyrella delineata (Peck)
A. H. Smith is nearly identical to Psathyrella rugocephala.
The two species can only be reliably separated on spore size
and spore morphology.

More information at 

Figure 1. Several specimens of Psathyrella rugocephala growing
on woody debris. Photo © Gary Emberger.

Figure 2. The browish, wrinkled cap is an important first
step in identifying Psathyrella rugocephala.
Photo© John Plischke III.

Figure 3. The cap surface of Psathyrella rugocephala is
described as corrugated and wrinkled and may even be somewhat
pitted. Photo © Gary Emberger.

Figure 4. The dark cap color of young speciemns fades to a a
tannish color as in the specimen on the left.
Photo © Gary Emberger.

Figure 5. There is usually abundant white mycelium at the base of
the stipe. Photo © Gary Emberger.

Figure 6. The partial veil may leave a ring zone on the upper
stalk and the cap margin may bear remnants of the veil.
Photo © Gary Emberger.

Figure 7. Psathyrella delineata strongly resembles
P. rugocephala. Reliable separation of the two species
requires examination of spore size and morphology.
Photo © William Roody.


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