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Page number:57 
Remarks (internal):Neither the data included with the Eaton specimen (NY) examined nor those in the original description were sufficient to identify a holotype with certainty. The specimen here selected as lectotype of H. chrysorhizon is that indicated as "TYPE" in Torrey's collection (NY).
The species most similar to P. chrysorhiza is P. omnivora (Shear) Burds. et Nakas. They are distinguished macroscopically on basidiocarp color and cordon development. Phanerochaete chrysorhiza is bright orange with well developed orange cordons and somewhat paler spines; P. omnivora is yellow or cream (including spines) with a white to cream and fimbriate to slightly cordonic margin. Microscopically P. omnivora can be distinguished because of its broader spores, usually fewer cystidia, and thinner hyphal walls, usually up to 1 µm thick.
Ecologically these species occupy vastly different niches. Phanerochaete omnivora occurs on dead wood debris of desert hard-wood shrubs and trees, while P. chrysorhiza inhabits dead hard-wood, or more rarely coniferous branches on the ground in moist areas. P. hanerochaete omnivora occurs in the Southwestern United States and east into Texas while P. chrysorhiza occurs throughout the Eastern United States and west into Texas (R.L. Gilbertson, pers. comm.).
Hallenberg (1978) suggested a close relationship between P. chrysorhiza and P. aculeata. However, P. aculeata is morphologically much more similar to P. sordida especially in the nature of the subiculum. Also P. aculeata lacks the loosely attached mem branous basidiocarp, the cordonic margin and the strongly hydnaceous hymenial surface.
The name Odontia crocea Lloyd (1914) has been found as a synonym of P. chrysorhiza (Miller 1933, Miller & Boyle 1943). The name is merely a misdetermination and a new combination for Sistotrema crocea Schw. because Lloyd states in his discussion that he is referring to the fungus described by Schweinitz. The citation must be considered a slip of the pen or, at best, a later homonym. Authentic specimens labeled O. croceum by Lloyd (BPI) are conspecific with P. chrysorhiza
 
Description type:Non-original description 
Description:Phanerochaete chrysorhiza (Torrey in Eaton) Budington et Gilbertson, Southw. Natur. 17: 417. 1973. FIG. 14
? Hydnum chrysorhizon Torr. in Eaton, Manual Bot., 309. 1822.
? Oxydontia chrysorhiza (Torr. in Eaton) Rogers et G. W. Martin, Mycologia 50: 308. 1958.
? Mycoacia chrysorhiza (Torr. in Eaton) Aoshima et Furukawa, Trans. Mycol. Soc. Japan 7: 135. 1966.
? Hydnophlebia chrysorhiza (Torr. in Eaton) Parm., Eesti NSV Tead. Akad. Toim. Biol. 16: 384. 1967.
? Grandiniella chrysorhiza (Torr. in Eaton) Burds., Taxon 26: 329. 1977.
= Hydnum fragillissima Berk. et Curt., Grevillea 1: 100. 1873.
? Acia fragillissima (Berk. et Curt.) Pat., Essai Tax. Hymen, p. 69. 1900 (as A. fragillissima (Berk.) Pat.).
? Oxydontia fragillissima (Berk. et Curt.) L. W. Miller, Mycologia 25: 294, 1933.
? Oxydontia fragillissima (Berk. et Curt.) L. W. Miller, Mycologia 25: 364. 1933 (nom. superfl.).
? Odontia fragillissima (Berk. et Curt.) C. A. Brown, Bot. Gaz. 96: 659. 1935.
? Mycoacia fragillissima (Berk. et Curt.) L. W. Miller et Boyle, Univ. Iowa Stud. Nat. Hist. 18: 42. 1943.
? Sarcodontia fragillissima (Berk. et Curt.) Nikol., Acad. Sci. U.R.S.S. Inst. Bot. V. L. Kom. Flora Plant. Crypt. U.R.S.S. 6: 184. 1961.
= Hydnum ishnodes Berk., Grevillea 1: 101. 1873.
= Hydnum chrysocomum Underw., Bull. Torrey Bot. Club 24: 82. 1897.
? Acia chrysocoma (Underw.) Pat., Essai Tax. Hymen. p. 69. 1900.
Lectotype (here designated): 237, in herb. Torrey, coll. Steward, in herb. NY.
Basidiocarp broadly effuse, up to 20 x 1 cm in extent, thin, membranous, easily separable, fertile area "reddish orange" (7A8) to "deep orange" (near 5A8), hydnaceous, spines up to 1.5 mm long, cylindrical or tapered to rounded apex, "orange white" (5A2) to "pale orange" (5A3); not discoloring in KOH; margin fibrillose to cordonic, cordons up to 1 mm diam, "reddish orange" (near 7A8); subiculum "reddish orange" (near 7A8).
Hyphal system monomitic. Subiculum a textura intricata to textura porrecta, 250-500 µm thick (excluding teeth), hyphae 4-7 (-9) µm diam, hyaline to pale yellow, firm walled or walls up to 2.5 µm thick, usually densely encrusted with hyaline crystals, septa widely spaced, mostly simple septate, with occasional single or multiple clamp connections, branching frequent, mostly at nearly right angles; tooth trama a compact textura porrecta, oriented perpendicular to substrate, hyphae 3.5-5.5 diam, pale yellow, simple septate, thin walled to firm walled, short celled, frequently branched, with scattered hyaline crystals; sub-hymenium a compact textura porrecta, hyphae 3.5-5 µm diam, short celled, hyaline, thin walled, simple septate, smooth, or lightly coated with pale yellow granules; cystidia ventricose, smooth, thin walled, hyaline, 18-40 x 4.5-6 µm; basidia clavate to broadly clavate, 15-20 x 4.5-6 µm, hyaline, thin walled, 4-sterigmate, sterigmata 3-3.5 µm long; basidiospores ellipsoid to narrowly ellipsoid, 4-5 x 2-2.5 µm, slightly flattened adaxially, hyaline, thin walled, smooth, Melzer's -, acyanophilous.
Habitat: Associated with a white rot of hardwood slash or rarely of conifer slash.
Distribution: Throughout eastern North America, common throughout the southeastern United States.
 
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