zoned phlebia; tree bacon, bacon strips (Lincoff); Finnish Karvaorvakka.
Epithet = strigose-zoned. Genus = with little dots.
Annual, effused (resupinate crust) or effused-reflexed stereoid or phlebioid fungus (resembles Stereum). Free edge is narrow to wider, rarely pileate (extending 3 cm or more). Upper surface zoned with weak or noticeable ridges (sulcate), light and dark brown to black, velvety hairy; margin paler. Underside smooth or bumpy (tuberculate) or ridged, dark brown, dark reddish brown, violaceus, to gray; gelatinous when fresh, drying hard and darker. Old herbarium specimens have underside mostly blackish and upper surface with dark brown and black zones; sometimes margin remaining brown. A key microscopic feature is the dendrohyphidia (dendrophyses, branched terminal cells) among the basidia (though these are obscure structures). Spores non-amyloid; cystidia absent; hyphal system monomitic, with clamp connections, but tramal hyphae thick-walled with sparse clamps and branches (so can look dimitic).
Very similar to Phlebia (Merulius), particularly Phlebia radiata, though that species is brighter red to orange and rarely has a projecting cap-like edge.
Texture is more leathery and coloration is darker than Stereum, which lacks clamp connections.
Hymenochaete rubiginosa has setae, and lacks clamp connections.
Xylobolus subpileatus is paler underneath and brittle when dry, lacks clamps, and has acanthocystidia.
Lopharia cinerascens has gray hirsute upper surface, and has large pointed cystidia.
Peniophora albobadia is mostly effused, with a white margin that is more fringed (under hand lens), and has encrusted cystidia in addition to dendrohyphidia.
White rot saprobe on dead hardwoods. According to literature it prefers aspen (Populus such as P. tremuloides) in northern areas but found on other hardwoods to the south. Was recorded on poplar, oak, and hickory from Chicago area 1902, 1903.
Starts growing in spring or summer and can be found into the winter.
Worldwide in temperate and subtropical regions. Throughout eastern North America and in Pacific Northwest.
Chicago Region status
Rare or uncommonly noticed. Collected four times in 2013 from Cook, DuPage, McHenry Counties in Illinois and Lake County, Indiana. Then identified a previous 2009 specimen from Lake County, Indiana. Later John Denk submitted a photo record for October 2006 in southern Cook County. Otherwise only known by several specimens from 1902, 1903, for Glencoe (on hickory log) and Riverside (on oak), Cook County, Illinois, and Miller (on dead poplar branches), Lake County, Indiana.
Most of the specimens in the Field Museum herbarium were identified or verified by William Bridge Cooke (from IL, IN, WI, MI, OH, PA, NY, MA, VT).
Stereumstrigosozonatum(Schwein.) G. Cunn.,
Transactions and Proceedings of the Royal Society of New Zealand 84 (2): 213 (1956)
Annual Report on the New York State Museum of Natural History 29: 45 (1878)
PhlebiazonataBerk. & M.A. Curtis,
Grevillea 1 (10): 146 (1873)
New England, USA.
The epithet strigoso-zonata previously had a hyphen but this is no longer the case following the guidelines of nomenclature.
This is a variable species and has been named repeatedly with 14 heterotypic synonyms (other epithets based on different type specimens).
The names Phlebia pileata and Phlebia zonata were also used for old herbarium collections.
See Lincoff's National Audubon Society Field Guide to North American Mushrooms (though the photo is too red)