Scientific name: Cryptoporus volvatus (Pk.) Shear.
Derivation of name: Cryptoporus means "with secret or
hidden pores;" volvatus means "provided with a volva."
Synonymy: Polyporus volvatus Pk.
Common names: Veiled polypore.
Occurrence on wood substrate: Saprobic; solitary or
grouped on the bark of stumps and standing dead conifers,
reported on living trees; May through August.
Dimensions: Cap 1.5-8.5 cm wide.
Upper surface: Fruit bodies (caps) are almost spherical to
hoof-shaped with the margin descending over the pores to form
a veil-like covering; whitish at first, becoming tan; smooth.
Pore surface: White to brown; hidden by cap veil.
Comments: An opening develops on the underside at maturity
to facilitate spore dispersal. This is the only veiled polypore.
More information at MushroomExpert.com:
Figure 1. Cryptoporus volvatus on conifer bark.
Photo © Larry Grand.
Figure 2. The small opening that develops on the underside.
Photo © Tom Volk.
Figure 3. Enlarging the opening reveals the pores.
Photo © Gary Emberger.
Figure 4. The brown pore surface, fully revealed by
the veil formed by the cap. Photo © Gary
Figure 5. A vertically sectioned specimen. The pore
through the veil is at the lower right and bark from the tree
is visible on the right side of the specimen. Brown
form a deposit pattern on the inside of the veil. The tubes,
6 mm long, and the context are clearly visible in this
section. Photo © John Dawson.