prl12380a prl12380c

Cryptoporus volvatus (Peck) Shear

Bulletin of the Torrey Botanical Club 29: 450 (1902)

veiled polypore. Scientific name = hidden pores, with a volva.
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 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.
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.
Specimens examined:
Marengo Ridge, McHenry County, PRL 12380, 2015 June 9, on dead two-needle pine.
Description links:
Michael Kuo ; Gary Emberger ; California Fungi [gives smaller spore size].
Related links:
C.H. Peck. 1880. Polyporus volvatus Peck, and its varieties. Bulletin of the Torrey Botanical Club 7 (10): 102–5.
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.
Records online:
Mushroom Observer ; MycoPortal
Taxon links:
185937 MycoBank ; Index Fungorum ; Species Fungorum