Cryptoporus volvatus

Cryptoporus volvatus (Peck) Shear

[look for on recently dead pine]

veiled polypore.
Epithet = with a volva. Genus = hidden pores.
Annual brackets sessile, semi-globose, up to 6 cm. May develop a stipe when fruiting on top of a log (Murrill 1903). Upper surface smooth, glabrous, pale yellowish, cream or tan; extends as a veil-like membrane underneath creating a chamber under the pore layer, developing a hole near the base. Pore surface pale to darker brown. Pores round, 4–5 per mm. Spores 12–16.5 × 4.5 µm, cylindric, smooth, non-amyloid. Hyphal system trimitic, with clamps. The veil is thought to retain moisture for spore production during dry summers.
Similar species
Distinctive genus with a veil covering under pores. Has some resemblance to a young Fomitopsis betulina (Piptoporus).
Causes a white rot of sapwood of conifers. Fruitbodies formed on recently dead trees. Most common on Pine (Pinus). Originally described by Peck from black spruce (Picea mariana, as Abies nigra). Also reported from fir (Abies), Douglas-fir (Pseudotsuga), hemlock (Tsuga), and tamarack (Larix). Spores apparently dispersed by wood-boring beetles.
The persistent brackets can likely be found year round.
Throughout North America but rare in the central states, Great Plains, and southeast. Also found in South America and East Asia. MyCoportal has records for USA, Canada, Mexico, Cuba, Puerto Rico, Argentina, Brazil, Papua New Guinea, China, and Japan.
Chicago Region status
Rare. Surprisingly, there are no known historic collections or records for Illinois or Indiana. There is only one for Wisconsin (MyCoportal). It was first found in the Chicago Region in 2015.
Specimens examined
Marengo Ridge, McHenry County, PRL 12380, 2015 June 9, on dead two-needle pine.

Taxon Details and Links

  • Cryptoporus volvatus (Peck) Shear, Bulletin of the Torrey Botanical Club 29: 450 (1902)
  • ≡ Basionym: Polyporus volvatus Peck, Annual Report on the New York State Museum of Natural History 27: 98 (1875)
  • Fomes volvatus (Peck) Cooke, Grevillea 13 (68): 119 (1885)
  • Scindalma volvatum (Peck) Kuntze, Revisio generum plantarum 3: 519 (1898)
  • Ungulina volvata (Peck) Pat., Essai taxonomique sur les familles et les genres des Hyménomycètes: 102 (1900)
  • = Polyporus obvolutus Berk. & Cooke, Grevillea 7: 1 (1878)
USA, New York, [Adirondack Mountains, Hamilton County], Indian Lake, July 1873, on trunks of dead trees, Abies nigra [= Picea mariana].
Several varieties were described from 1875 to 1907 but are not recognized as distinct.
Michael Kuo
Gary Emberger
California Fungi [gives smaller spore size]
C.H. Peck. 1880. Polyporus volvatus Peck, and its varieties. Bulletin of the Torrey Botanical Club 7 (10): 102–5. DOI: 10.2307/2477509 [read online at Biodiversity Heritage Library]
W. A. Murrill. 1903. The Polyporaceae of North America V: The genera Cryptoporus, Piptoporus, Scutiger and Porodiscus. Bulletin of the Torrey Botanical Club 30 (8): 423-434 DOI: 10.2307/2478728 [read online at Biodiversity Heritage Library]
Mushroom Observer
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Cite this page as: Leacock, P.R. (2017 Nov 25). Cryptoporus volvatus - MycoGuide. Retrieved from

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