Polyporus brumalis Pers.: Fr.
winter polypore

Species account author: Ian Gibson.
Extracted from Matchmaker: Mushrooms of the Pacific Northwest.

Introduction to the Macrofungi


© Michael Beug     (Photo ID #17616)


E-Flora BC Static Map

Distribution of Polyporus brumalis
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Species Information

fungoid (Breitenbach)
mild (Breitenbach)
spores 6-7.5 x 2-2.5 microns, cylindric, slightly curved, smooth, inamyloid, colorless; basidia 4-spored, 16-22 x 5-6.5 microns, clavate, with basal clamp; cystidia absent; hyphae dimitic, generative hyphae of context 4-10 microns wide, colorless, thin-walled, with clamp connections, occasionally branched, binding hyphae of context with swellings up to 13 microns wide but mostly 4-10 microns wide, with dendritic branching and branches tapering to 1-2 microns wide, colorless, thick-walled, nonseptate, hyphae of trama 2.5-6 microns, similar, less frequently branched, (Gilbertson), spores 5-7 x 1.5-2.5 microns, cylindric to sausage-shaped, smooth, (Phillips)
Spore Deposit:
white (Phillips)
no (Phillips)

Habitat and Range

Polyporus arcularius has a generally paler cap and larger pores that are more elongated radially, and larger spores, (Gilbertson); Polyporus alveolaris has a paler cap, more lateral stem, and larger pores and spores, (Gilbertson)
annual, on dead hardwood, associated with a white rot, (Gilbertson), on dead hardwood, especially birch, (Phillips), fall, winter, early spring (Buczacki)