Scientific name: Oligoporus caesius (Schrad.: Fr.) Gilbn. &
Derivation of name: Oligoporus means "with few or
pores"; caesius means "bluish gray."
Synonymy: Polyporus caesius Schrad.: Fr.
Common names: Blue cheese polypore.
Occurrence on wood substrate: Saprobic; solitary on
decaying deciduous and conifer wood; August through
Dimensions: Caps 1-8 cm wide
Upper surface: Whitish with grayish-blue tints, bruising blue;
hairy to glabrous.
Pore surface: White to bluish, bruising bluish; pores 3-6 per
Comments: Odor fragrant. This polypore is soft, watery and
spongy when fresh.
More information at RogersMushrooms.com:
Figure 1. Oligoporus caesius on a dead branch. Note the
overall grayish-blue coloration. Photo © Dianna Smith.
2. Collected specimens with the grayish-blue
typical of this species. Fresh specimens are soft
watery. Photo © Gary Emberger.
Figure 3. The coloration is intense in these specimens.
Photo © George Barron.