Scientific name: Stereum ostrea (Blume and Nees) Fries
Derivation of name: Ostre- means "oyster" in reference to
Synonyms: S. fasciatum; S. lobatum; S. versicolor.
Common name(s): False turkey tail.
Occurrence on wood substrate: Saprobic; clustered on
decaying logs, stumps, and branches of deciduous trees; June
Dimensions: Petal to fan-shaped or semicircular caps are 1-
7 cm wide.
Sterile upper surface: Covered with silky hairs; zonate with
orange, gray, reddish-brown, and other colored zones; often
whitish at the margin.
Fertile lower surface: Smooth (small bumps may be
present), buff to cinnamon-buff to reddish-brown.
Comments: This is our largest and most colorful Stereum
species. It is sometimes confused with turkey tail, a species of
polypore. Use a hand lens to make sure pores are absent.
More information at MushroomExpert.com:
More information at TomVolkFungi.net:
Figure 1. Stereum ostrea clustered on a log.
Photo © Gary Emberger.
Figure 2. False turkey tail is sometimes confused with
turkey tail, Trametes versicolor, a species with a poroid
fertile surface. A hand lens will confirm the absence of
pores in false turkey tail. Photo © Gary Emberger.
Figure 3. Overlapping clusters of false turkey tail. Sterium
ostrea fruit bodies do not tend to fuse together as much as
some other Stereum species. Photo © Gary Emberger.
The colorful, zonate upper surfaces of Stereum
ostrea. Photo © Gary Emberger.
Figure 5. Some of these false turkey tails are almost fused
such a way as to form funnels.
I have collected some
specimens that are actually in the form of a funnel.
Photo © William Roody.
The specimen on the right in the foreground was
placed upside down in order to show the fertile surface.
Note the white margin. Photo © Gary Emberger.
Figure 7. The smooth, fertile, basidia-bearing lower
surface (left) compared to the sterile silky, zonate upper
surface on the right. Photo © Gary Emberger.