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Fomitopsis cajanderi

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

by Michael Kuo

Widely distributed in North America's conifer forests, Fomitopsis cajanderi is a tough polypore with a gorgeous pink pore surface and, when fresh and young, pink shades on its cap surface. Fomitopsis rosea is very similar, but tends to develop more clearly separated, hoof-shaped caps; it also has paler flesh and differs microscopically.

The illustrated collection was made on Douglas-fir in California; Fomitopsis cajanderi is particularly common on this host in western North America.

Fomitopsis subrosea and Fomes subrosea are synonyms.


Ecology: Saprobic on the dead wood of conifers and, rarely, hardwoods (especially those that grow in conifer forests); also often parasitic on living trees; causing a brown cubical rot; growing alone or gregariously; perennial; fairly widely distributed in North American conifer forests.

Cap: Individual at times, but more often fused laterally with other caps, or arranged in shelves; up to about 20 cm across and 10 cm deep; flat or broadly convex; finely hairy, or bald when older; often wrinkled; fairly soft at first; not becoming thickly encrusted; pink to pinkish purple when fresh and young, darkening to pinkish gray, pinkish brown, dark brown, or nearly black; usually paler on the margin.

Pore Surface: Often extending onto the wood below the mushroom ("effused-reflexed"); rose pink when fresh, but fading somewhat with age; with 3-5 round to angular pores per mm; tube layers usually fairly distinct, up to 2 cm deep.

Stem: Absent.

Flesh: Pinkish brown; corky to leathery, becoming woody with age.

Odor: Fragrant.

Chemical Reactions: KOH black on flesh and cap surface.

Microscopic Features: Spores 5-7 x 1.5-2 µ; allantoid; inamyloid; smooth. Hyphal system dimitic.

REFERENCES: (Karsten, 1904) Kotlaba & Pouzar, 1957. (Saccardo, 1905; Overholts, 1953; Arora, 1986; Gilbertson & Ryvarden, 1986; Phillips, 1991/2005; Lincoff, 1992; Barron, 1999; McNeil, 2006.) Herb. Kuo 01120604.

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Fomitopsis cajanderi

Fomitopsis cajanderi

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Kuo, M. (2010, February). Fomitopsis cajanderi. Retrieved from the MushroomExpert.Com Web site: