Norw. J. Bot. 19: 237. 1972.
Common Name: none
Synonym: Hirschioporus abietinus (Dickson:Fr.) Donk
Fruiting body annual or short-lived perennial, 1-4 cm broad, up to 0.5 cm thick, flattened to slightly convex, margin wavy, forming tiers of overlapping sessile shelves; surface hairy, zonate, whitish to light-grey, usually pale purple near the margin, in age sometimes greenish from colonizing algae; flesh leathery, thin, pale brown to purplish-brown.
Tubes single-seried, 1-3 mm long, pale brown; pores 2-4 per mm, circular to angular, at maturity frequently toothlike; purple when young, fading to brownish-purple.
Spores 4-6.5 x 2.5-3.0 µm, smooth, allantoid (curved cylindrical); spore print off-white.
In overlapping tiers on dead conifer wood, found year-round, shriveling in dry weather but capable of reviving; fresh fruitings emerging from late fall to mid-winter.
This attractive small, leathery shelf fungus makes up in numbers for its lack of size, often dominating on conifer logs. The white, hairy, zonate cap, usually with a purplish margin when young, and purple-tinged pores make it easy to recognize, although in age the pores may breakdown to form spines causing possible confusion with species of tooth fungi. Look-alikes include Schizophyllum commune, also with a whitish, hairy cap, distinguished by a "split gill" hymenium, and Fomitopsis cajanderi, an uncommon but larger, woody polypore that has a blackish-brown cap and pinkish pore surface. A closely related species, Trichaptum biformis, (aka Hirschioporus pargamenus), grows primarily on hardwoods.
Bernicchia, A. (2005). Polyporaceae s.l. (Fungi Europaei). Edizioni Candusso: Alassio, Italy. 807 p.
Breitenbach, J. & Kränzlin, F. (1986). Fungi of Switzerland. Volume 2: Non-Gilled Fungi. Verlag Mykologia: Luzern, Switzerland. 412 p.
Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
Ellis, M.B. & Ellis, J.P. (1990). Fungi without Gills (Hymenomycetes and Gasteromycetes). Chapman and Hall: London, England. 329 p.
Gilbertson, R. L. & Ryvarden, L. (1987). North American Polypores, vol. 2. Fungiflora: Oslo, Norway. 452 p.
Overholts, L.O. (1953). The Polyporaceae of the United States, Alaska, and Canada. University of Michigan Press: Ann Arbor, MN. 466 p.