Transactions and Proceedings of the Royal Society of New Zealand 83 (4): 622 (1956)
- ≡ Basionym: Thelephora cinerascens Transactions of the American Philosophical Society 4 (2): 167 (1832) ,
- ≡ Peniophora cinerascens Sylloge Fungorum 6: 646 (1888) ,
- ≡ Stereum cinerascens Botanical Journal of the Linnean Society 27: 179 (1890) ,
- = Stereum neglectum Ann. Rep. N.Y. St. Mus. Nat. Hist. 33: 22 (1880) ,
- = Stereum purpurascens Mycol. Writ. 4 (Letter 53): 15 (1914) ,
- bristly parchment (Lincoff, 1981).
- Stereoid fungus, usually annual, resupinate to effused-reflexed (possibly sessile); fruitbodies small or confluent and forming large patches; cap or protruding edge up to 1.5 cm wide, 1–2 mm thick, tough, umbonate when young; upper surface velvety, matted-tomentose to strigose-hirsute, zoned, sulcate (grooved), grayish to pale brown, with black zone beneath the tomentum, may be green in age with algae; hymenium smooth or with scattered bumps (
tropical specimens may be somewhat irpicoid or shallowly poroid), color
grayish yellow, brownish gray, light brown to dull violet, often with pink or violaceous tinges when fresh; growing margin white. Microscopic characters include a dimitic hyphal system of clamped generative hyphae mixed with skeletal hyphae; hymenium with large, acute, thick-walled (metuloid) cystidia that are encrusted; basidiospores ellipsoid (ovoid to cylindrical), smooth, hyaline, non-amyloid, thin-walled, 8–16 × 5–8 µm.
- Similar species:
- The upper surface resembles Trametes hirsuta (a bracket with pores) but the black zone beneath the hairs may show as thin black zone lines similar to those of Trametes versicolor. Punctularia strigosozonata is darker brown, upper surface velvety, and hymenium has non-protruding dendrohyphidia instead of large protruding cystidia. Stereum is similar but lacks clamp connections and the spores are amyloid.
- White rot of hardwoods (angiosperms), particularly elm (Ulmus), box elder (Acer negundo) and mulberry (Morus).
- Starts growing in spring or summer and can be found into the winter.
- Worldwide though more common in North and South America. Widespread in North America, throughout the eastern states.
- Chicago Region status:
- Rare. The first identified Chicago area collections were from McHenry County and Cook County in 2014. There are likely more specimens, but so far only two have been identified (during 2015 by Leacock and Nakasone), one for 2004 and one for 2005, both from Shabbona Lake State Park. MycoPortal lists specimens from central and southern Illinois: Adams, Champaign, Johnson, McLean, Monroe, and Piatt Counties.
- This species seems obscure because it is treated in few field guides or mushroom websites, does not have an English Wikipedia page, and had no photos on Mushroom Observer. Ryvarden (2010) says
clamps rather scattered and often difficult to find.This is certainly true. The generative hyphae don't rehydrate well and are difficult to tease apart and the septa and clamps are rare. But the cystidia are huge, long-pointed, scattered to dense, and can be seen protruding from the hymenium when viewed under a dissecting scope.
- Schweinitz collection, on trunk of half dead Morus alba [white mulberry], Bethlehem, Pennsylvania, USA.
- Starting out in Thelephora (1832), this species has been transferred to Hymenochaete (1846), Corticium (1888), Peniophora (1888), Stereum (1890), Lloydella (1901), and finally Lopharia (1956). Lopharia cinerescens is an orthographic variant spelling. This species has up to a dozen heterotypic synonyms dating from 1860 to 1914, but Index Fungorum and Mycobank do not agree on whether Lopharia mirabilis is a synonym (along with its own synonyms).
- Specimens examined:
- Chicago Region: Illinois, Cook County, P.R. Leacock 12216, 2014; DeKalb County, W.C. Gaswick 557, 2004, and P.R. Leacock 7047, 2005; McHenry County, P.R. Leacock 11612, 2014.
- Midwest: Illinois, Lawrence County, A. D. Parker, 1972; Wisconsin, A. D. Parker, 1977.
- Excicatti: C. L. Shear, New York Fungi 313, Stereum neglectum, New York, 1894, on decaying log of Ulmus americana; E. Bartholomew, Fungi Columbiani 2337, Peniophora cinerascens, Kansas, 1906, on bark of dead Acer negundo; E. Bartholomew, Fungi Columbiani 4648, Peniophora cinerascens, Georgia, 1914, on bark of Acer negundo.
- Description links:
- Chamuris, G.P. 1988. Mycologia Memoirs. 14:88.
- Hjortstam, K., Ryvarden, L. 2007. Synopsis Fungorum. 23:79.
- Ryvarden, L. 2010. Stereoid fungi of America, Synopsis Fungorum. 28:114.
- Lincoff, G. 1981. National Audubon Society Field Guide to North American Mushrooms.
- Records online:
- Mushroom Observer ; MycoPortal (includes L. mirabilis)
- Taxon links:
- 122188 MycoBank ; Index Fungorum ; Species Fungorum