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Postia leucospongia (Cooke and Harkn.) Julich
Oligoporus leucospongia

Life   Fungi   Basidiomycota   Fomitopsidaceae   Postia

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California Fungi—Postia leucospongia Postia leucospongia
(Photo: © Michael Wood)

Postia leucospongia (Cooke & Hark.) J├╝lich
Mycotaxon 22: 365. 1985.

Photo: The snow in the background shows this fungus' habit of fruiting near melting snow banks

Common Name: none

Synonyms: Tyromyces leucospongia (Cooke & Hark.) Bondartsev & Singer; Oligoporus leucospongia (Cooke & Hark.) Gilb. & Ryvarden; Spongiporus leucospongia (Cooke & Hark.) Murrill; Cooke & Hark.; Polyporus leucospongia Cooke & Harkn

  • Sporocarp

    Fruiting body annual, effused-reflexed, shelving, 4.0-13.0 cm long, up to 5.0 cm in width; cap shell-shaped, the margin persistently incurved, arching over, and partially covering the pore surface; upper surface when young covered with a whitish matted-tomentum, becoming buff to pale-tan in age, eventually nearly glabrous to sometimes wrinkled; context approximately 1.0-2.0 cm thick, two-layered, the upper half tan, cottony, soft, the lower portion whitish and rigid; odor not distinctive; taste acrid to somewhat bitter.

  • Hymenophore

    Pores 2-3/mm, angular, the edges minutely fringed in youth, dentate in age (use hand lens), at first cream, pale-tan in age; tube layer up to 5.0 mm thick, becoming hard/rigid at maturity.

  • Spores

    Spores 4.5-6.5 x 1.0-1.5 µm, narrowly-oblong to sausage-shaped, smooth, thin-walled, hilar appendage not obvious, inamyloid; spore deposit not seen.

  • Habitat

    Solitary or imbricate in small groups on wood of montane conifers, particularly red fir ( Abies magnifica ) and Lodgepole pine ( Pinus contorta ); fruiting in late spring, dried fruiting bodies persisting through the summer; common.

  • Edibility

    Inedible; tough, unpleasant taste

  • Comments

    Postia leucospongia is a snowbank species found throughout the montane regions of the western United States. It occurs commonly in the spring at higher elevations of the Sierra Nevada and presumably the Coast Ranges as well. An important fieldmark is the soft, white, upper surface which partially encloses the pore layer. Postia leucospongia is sometimes found fruiting with another annual polypore, Pycnoporellus alboluteus . The distinctive orange hues of the latter, however, make it unlikely to be confused. Both species have fruiting bodies with a foam-like quality and are surprisingly light for their size.

  • References

    Cooke, M.C. North American Fungi. Grevillea 11: 106-111. ( Protologue )
    Desjardin, D.E., Wood, M.G. & Stevens, F.A. (2015). California Mushrooms: The Comprehensive Identification Guide. Timber Press: Portland, OR. 560 p.
    Gilbertson, R.L. & Ryvarden, L. (1986). North American Polypores, vol. 1. Fungiflora: Oslo, Norway. 433 p.
    Ginns, J. (2017). Polypores of British Columbia (Fungi: Basidiomycota). Province of British Columbia: Victoria, BC. 260 p.
    Lindsey, J.P. & Gilbertson, R.L. (1978). Basidiomycetes that Decay Aspen in North America. J. Cramer: Vaduz. 406 p.
    Overholts, L.O. (1953). The Polyporaceae of the United States, Alaska, and Canada. University of Michigan Press: Ann Arbor, MN. 466 p.

  • Other Descriptions and Photos Main Photo

    (D=Description; I=Illustration; P=Photo; CP=Color Photo)

The Fungi of California
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Updated: 2018-12-12 21:25:28 gmt
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