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Page number:350 
Description type:Non-original description 
Description:Phlebia setulosa (Berk. & M. A. Curtis) Nakasone, Mycol. Mem. 15: 262. 1990. Figs. 8, 9 Hydnum setulosum Berk. & M. A. Curtis in Berk., Grevillea 1: 100. 1873.
Odontia setulosa (Berk. & M. A. Curtis) Rick, Egatea 18: 127. 1933.
= Steccherinum setulosum (Berk. & M. A. Curtis) L. W. Miller, Mycologia 27: 362. 1935. Hvphodontia setulosa (Berk. & M. A. Curtis) Maas G., Persoonia 7: 567. 1974.
Basidiomata annual, resupinate, adnate, up to 15 x 7 cm, moderately thin, up to 0.9 mm thick, ceraceous, hydnaceous but smooth between teeth, teeth velutinous, easily breaking off, sometimes with a few fine irregular cracks, with up to three layers: a thin, subceraceous upper layer concolorous with hymenium and teeth, a middle layer of white, felty mycelium, and a lower layer next to substrate of ceraceous, brown mycelium; hymenial surface continuous, covering terete or slightly compressed teeth, teeth up to 10.0 x 0.5 mm, 1-3 teeth per mm, solitary, fused at base, or fused throughout length, gradually tapering to apex, apices entire and acute but in younger teeth obtuse and fimbriate, teeth and hymenial surface between teeth concolorous, sometimes teeth gradually becoming darker, occasionally paler, toward apex, pale yellow (4A3), light yellow (4A4-5), light orange (5A4-5), greyish orange (5B4-5), brownish orange (5C5), to yellowish brown (5D4), occasionally light brown (6D5), with fine white pubescence from projecting cystidia; margin up to 5 mm wide, smooth or verrucose, sterile but pubescent from projecting cystidia, gradually thinning out, fimbriate, adnate or slightly detached, smooth, tomentose to pilose, white to yellowish white (4A2) or orange white (5A2), sometimes translucent.
Hyphal system monomitic. Tooth trama a textura porrecta, composed of agglutinated, vertically arranged hyphae (similar to subicular hyphae) and encrusted or smooth cystidia, at apex hyphae obtuse, smooth or lightly encrusted with tiny, hyaline crystals. Subiculum between teeth up to 600 µm, thick and often in two distinct layers: (a) next to substrate a dense textura porrecta with hyphae oriented parallel to substrate, 200-400 µm thick, conglutinate; (b) upper subiculum an open textura intricata of conglutinate hyphae and scattered encrusted cystidia, 100-200 µm thick; subicular hyphae 2.5-4.0 µm diam, nodose septate, sparingly to moderately branched, often with H-connections, tightly agglutinated; walls hyaline, thin to thick, up to 2 µm thick. Subhymenium thickening, 50-200 µm thick, composed of indistinct, agglutinated hyphae and encrusted cystidia arranged in a dense, compact tissue arranged perpendicular to substrate and tooth axis; subhymenial hyphae 1.5-3.0 µm diam, nodose septate, short-celled, frequently branched, somewhat agglutinated; walls hyaline, thin, smooth. Hymenium a dense, compact, conglutinate palisade of basidia and cystidia. Cystidia cylindrical to clavate, 40-270 x 5.5-10.0(-11.0) µm, clamped at base, nonstaining, enclosed or projecting up to 45 µm, arising from tooth trama, subhymenium and hymenium; walls hyaline, 1-5 µm, thick, sometimes thinning toward apex, smooth or lightly to heavily encrusted with fine to coarse, hyaline crystals, embedded cystidia often encrusted but if protuding then encrusted at apex only. Basidia clavate, 22-40 x 5.0-6.5 µm, tapering to 2.5-4.0 µm diam at base, with a basal clamp, 4-sterigmate; walls hyaline, thin, smooth. Basidiospores ellipsoid to broadly cylindrical, 5.0-6.5(-7.0) x 3.0-3.5 µm; walls hyaline, slightly thickened, smooth, negative in Melzer's reagent.
Habitat: Typically well-decayed, decorticated wood of angiosperms, occasionally on bark.
Type of rot: Associated with a white-rot decay. Distribution: Widely scattered in eastern United States, also reported from Manitoba, Nova Scotia, and Northwest Territories in Canada (Ginns and Lefebvre, 1993).
Type specimen examined: UNITED STATES.--Alabama: no location, on Liquidambar Peters, Curtis no. 6086 (HOLOTYPE of Hydnum setulosum: K.
Remarks.--Phlebia setulosa is easily recognized because of the pubescent teeth, encrusted cystidia, and relatively large spores. Although locally abundant, it is not common. The cystidia of the tooth axis may resemble skeletal hyphae, thus P. setulosa was placed in the genus Steccherinum and later in Hvphodontia. However, cultural and molecular evidence suggest that the correct placement of this species is in Phlebia (Nakasone, 1990a, 1991).
For a description of the type specimen, see Maas Geesteranus (1974) and Gilbertson (1965). Additional descriptions of basidiomata are available in Miller (1935) and Miller and Boyle (1943). Cultures are described by Lombard and Chamuris (1990), Nakasone (1990a), and Wang (1965).
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