Scientific name: Stereum hirsutum (Willdenow:Fries) S. F.
Derivation of name: Hirsut- means "hairy" (hirsute) in
reference to the hirsute upper surface of this fungus.
Common name(s): Hairy parchment.
Occurrence on wood substrate: Saprobic; overlapping,
laterally fused clusters on dead conifers or hardwoods; July
through November, persistent.
Dimensions: Shelf-like caps are 0.5 to 2 cm wide and may be
Sterile upper surface: Zoned; whitish to pale cinnamon-
brown to grayish; surface densely covered with coarse, stiff
Fertile lower surface:
Smooth; yellowish to reddish-tan or
Comments: There are a number of closely related Stereum
species. Some species "bleed" (e.g., S. gausapatum) a red
fluid when cut or
scratched, others do not. The variability
among these species is such that some mycologists group
Stereum hirsutum, Stereum complicatum, and even
Stereum gausapatum as varieties of a single species. The
web sites below explore some of the
application of certain names to certain
More information at MushroomExpert.com:
More information at TomVolkFungi.net:
Figure 1. This Stereum hirsutum was growing on a conifer
log in Maine. Photo © Gary Emberger.
Figure 2. A closer look at the specimen in Figure 1. This
specimen was photographed in the rain and is quite wet
giving it a water-logged look. Photo © Gary Emberger.
Figure 3. Note the zonation and the conspicuous coarse
hairs on the upper surface. Photo © Gary Emberger.
Figure 4. The appearance of the lower fertile surface.
There was no evidence of "bleeding" when this fungus was
torn away from the log. Photo © Gary Emberger.