prl11521 prl11806

Truncospora ohiensis (Berk.) Pilát

Acta Musei Nationalis Pragae 9B (2): 108 (1953)

Uncommon name:
Ohio bracket-fungus
Fruitbody:
Perennial, very small, tough, hoof-shaped bracket. May have narrow cap edge when it is more resupinate. Upper surface ridged (sulcate), sometimes zonate; pale then brown, older parts black. Small white pores are round, thick-walled. Context is white to pale brown. Spores hyaline, elliptical, thick-walled, truncate at end with germ pore.
Similar species:
This is our smallest perennial bracket. Most other small polypores are not this firm in texture, or perennial with this shape. But Datronia scutellata is very similar. The two species are confused easily and old herbarium collections should be checked. Datronia scutellata makes an annual bracket, upper surface is soon dark brown to black, pores white to brown, context pale brown; spores large and cylindrical; grows on various hardwoods, often on alder in northern Great Lakes Region.
Ecology:
Saprobe on dead hardwoods, causing white rot. Typically on logs that have lost their bark (decorticated). Elsewhere reported from fence posts and fence rails.
Phenology:
Perennial brackets can be found year-round.
Biogeography:
Widespread across eastern North America. This is an American species not seen in Europe. Spirin et al. (2015) did not list any western specimens. The Gilbertson 16372 specimen on oak in Arizona is the segregate species Truncospora arizonica.
Chicago Region status:
Fairly common. Found in oak woodland, in mixed hardwoods, and oak savanna. We have 300 observations over 20 years but 85% of these records are from plot studies because it is easily overlooked. Two historic records are from River Forest and Riverside on west side of Chicago.
Type:
Waynesville, Ohio, U.S.A. [NY] Photos of Type.
Taxonomy:
This little species was also transferred to Ungulina (1900), Ganoderma (1927), Fomitopsis (1941), and Poria (1959). Spirin et al. (2015) described six new species in the Truncospora ohiensis group; some are found in Arizona, Texas, Florida and Mexico.
Specimens examined:
More than 100 collections from Chicago Region. I usually find only a few at a time. The fruiting represented by PRL 11806 was exceptional with more than 50 fruit-bodies. Photos are from McHenry County, P.R. Leacock 11521, and Cook County, P.R. Leacock 11806.
Description links:
Michael Kuo.
Related links:
Similar species Datronia scutellata in Ontario.
Spirin V., J. Kout, J. Vlasák. 2015 (2014). Studies in the Truncospora ohiensisT. ochroleuca group (Polyporales, Basidiomycota). Nova Hedwigia. 100: 159-175. Also available on Research Gate.
Records online:
Mushroom Observer ; MycoPortal
Taxon links:
291633 MycoBank ; Index Fungorum ; Species Fungorum