Scientific name: Pycnoporus cinnabarinus (Jacq.:Fr.) Karst.
Derivation of name: Pycnoporus means "with compact,
dense pores"; cinnabarinus means "bright red" or
"vermillion" in reference to the coloration of this fungus.
Synonymy: Polyporus cinnabarinus Jacq.: Fr.
Common names: Cinnabar-red polypore.
Occurrence on wood substrate: Saprobic; solitary or
grouped, sometimes fused and overlapping on dead
deciduous wood, rarely conifer wood; year-round.
Dimensions: Caps 3-14 cm wide and up to 1.5 cm thick.
Upper surface: Orange to reddish-orange, fading in age to
whitish; wrinkled, warted or smooth.
Pore surface: Orange-red, fading less than the cap surface;
pores 2-4 per mm.
Comments: Another species, P. sanguineus, resembles
Pycnoporus cinnabarinus but is thinner (up to 0.5 cm
thick), has a smaller cap, and is not as common.
More information at RogersMushrooms.com:
Figure 1. Intensely colored fresh specimens of Pycnoporus
cinnabarinus. Photo © Nathan Wilson.
Figure 2. Photo © John Plischke III.
Figure 3. Top surfaces (upper) and pore surfaces (lower) of
several foray specimens. Photo © Gary Emberger.
Figure 4. Specimens that attracted the attention of the Dean
of the School of Science, Engineering and Health. Photo ©
Figure 5. In time, the orange-red colors fade.
Photo © Larry
Figure 6. The pore surfaces usually fade less than
the cap surface as illustrated by the pore surfaces
in the center. Photo © Steve Nelson.
Figure 7. Pores of Cinnabar-red polypore. Photo © Fred