Scientific name: Cystoderma granosum (Morg.) A.H.
Sm. & Singer.
Derivation of name: Gran- means "seed" or "grain" and
refers to the "grains" or granules covering the cap and stipe
of this mushroom.
Synonyms: Armillaria granosa (Morg.) Kauffm.
Common name(s): None.
Occurrence on wood substrate: Saprobic; solitary to
grouped to present in cespitose clusters on
wood; August through October.
Dimensions: Caps are 2.5-9 cm wide; stipes are 5-7.5 cm
long and 8-15 mm thick.
Cap: Bright orange to dull orange or ochre-tawny; dry;
covered with granulose scales or finely powdery; sometimes
Gills: Attached; whitish.
Spore print: White.
Stipe: Colored and with the same granular material as the
cap up to the flaring ring, whitish above the ring.
Veil: Persistent and flaring.
Comments: Note that the species Cystoderma
granulosum (Batch:Fries) Fayod has a very similar name
but does not grow on wood.
Figure 1. Cystoderma granosum. Photo © William
Figure 2. Closeup of one of the mushrooms in Figure 1
showing the attached gills and the partial veil separating
the cap margin. Photo © William Roody.
A specimen as it appeared on theNEMF
tables. The granular material on the stipe is
present up to the
ring but not above. Photo © Gary
Figure 4. A specimen with a more orange coloration
and showing the granular scales on the cap and stipe.
Photo © Gary Emberger.