Major Groups > Polypores > Fomitopsis rosea

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Fomitopsis rosea

[ Basidiomycetes > Polyporales > Fomitopsidaceae > Fomitopsis . . . ]

by Michael Kuo

The deep pink pore surface of this tough perennial mushroom is a pleasant surprise--and proof that you can't always judge a polypore by its cover!

Fomitopsis rosea is very similar to Fomitopsis cajanderi, but can usually be distinguished on the basis of its more clearly defined, separate and fan-shaped to hoof-shaped caps (the caps of Fomitopsis cajanderi tend to be fused) and its paler, silvery pinkish to pinkish gray flesh (the flesh of Fomitopsis cajanderi is pinkish brown). Microscopic features also separate the two species.

Description:

Ecology: Saprobic on the dead wood of conifers--especially Engelmann spruce and other high-elevation spruces in western North America--and occasionally on quaking aspen; apparently sometimes parasitic on living trees, including Douglas-fir in the Pacific Northwest; causing a brown, cubical rot; growing alone or gregariously; perennial; precise distribution uncertain because of confusion with Fomitopsis cajanderi, but clearly present in western and northeastern conifer forests.

Cap: Usually individually discrete; up to about 12 cm across and 6 cm deep; shell-shaped to hoof-shaped; finely hairy when young, becoming bald; with age becoming cracked and wrinkled; pinkish to creamy along the margin, pinkish brown to brown, gray, or nearly black overall when mature.

Pore Surface: Rose pink when fresh, becoming brownish pink to brownish; with 3-5 round to angular pores per mm; tube layers distinct, up to 5 mm deep.

Stem: Absent.

Flesh: Silvery pinkish to grayish pink or pinkish brown; corky to woody.

Odor: Not distinctive.

Chemical Reactions: KOH dark gray to black on flesh.

Microscopic Features: Spores 5.5-7.5 x 2-2.5 µ; cylindric; inamyloid; smooth. Hyphal system dimitic.

REFERENCES: (Albertini & Schweinitz, 1805) Karsten, 1881. (Fries, 1821; Saccardo, 1888; Overholts, 1953; Smith, Smith & Weber, 1981; Gilbertson & Ryvarden, 1986; McNeil, 2006.) Herb. Kuo 08130803.

 

Fomitopsis rosea

Fomitopsis rosea

Fomitopsis rosea



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Kuo, M. (2010, February). Fomitopsis rosea. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/fomitopsis_rosea.html