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Page number:124 
Description type:Original description 
Description:Phanerochaete chrysosporium Burds., sp. nov. FIGS.l-ll
HOLOTYPE--U.S.A., Arizona: HHB 6251, on dead wood of Platanus wrightfi S. Wats. (Arizona sycamore), Guadalupe Canyon, Peloncillo Mts., Cochise County, AURust 25, 1971 (CFMR). Isotype in BPI and ARIZ.
CON.STAT. --Chrysosporium pruinosum (Gilman et Abbott) Carmichael, Can. J. Bot. 40: 1166. 1962.
= Sporotrichum pruinosum Gilman et Abbott, Iowa State Coll. J. Sci. 1: 306. 1927.
= Chrysosporium lignorum Bergman et Nilsson (nom. nud.), Dept. Forest Prod., Roy. Coll. Forest., Stockholm, Res. Notes No. 53, p. 28. 1966.
=(?) Sporotrichum pulverulentum Novobranova, Akad. Nauk U.S.S.R., Botan. Inst. Nov. Sist. Niz. Ractondi 9: 180. 1972.
Basidiocarps broadly effused, (indeterminate), membranous, moist when fresh, yellowish-white (3A2)1 to light brown (5D5), up to 0.25 mm thick, loosely attached or separable in small pieces, smooth, continuous, not cracking; margin rather abrupt or up to 2 mm broad, sterile, very thin, powdery or finely granular, irregular in outline, white, non-rhizomorphic; subiculum byssoid, white. Hyphal system monomitic; subicuDum a textura intricata, hyphae (Fig. 4) (3.5-)4.5-6(-7) µm diam, hyaline, thin walled or with walls up to 1 µm thick, lacking clamps, branched at nearly right angles, smooth near substrate to heavily encrusted with large hyaline crystals near subhymenium, sometimes with oval to spherical chlamydosporelike thick walled cells near substrate; subhymenium up to 75 µm thick, a compact textura intricata-porrecta, hyphae 2.5-4 vm diam, thin walled or with slight wall thickening, somewhat agglutinated; hymenium composed of cystidia (Fig. 1) and basidia (Fig. 2); cystidia (Fig. 1) arising at various levels of the subhymenium and subiculum, 60-150 (-250) x 6.5-9 µm, cylindrical, thin walled or with slight wall thickening, hyaline, smooth, obtuse at apex, septate only at base, lacking clamps, protruding up to 70 µm; basidia (Fig. 2) 22-35 x 5-6 µm, clavate, hyaline, thin walled, septate at base, lacking clamps, 4-sterigmate, sterigmata 4-5 µm long; basidiospores (Fig. 3) (5.5-) 6-7.5(-9) x 3-4 µm, depressed ovoid, hyaline, thin walled, smooth, not reacting with Melzer's reagent.
Etymology: from its Chrysosporium imperfect state.
Additional Specimens Examined: U.S.A., New York MJL 98, on dead wood of Ulmus emericane L., Monroe County (?); Maryland-ln4297, on dead wood of liriodendron tutipifere L., Montgomery County. Both in CFMR.
Remarks: Phanerochaete chrysosporium basidiocarps are distinguished by their long, broad, cylindrical, smooth cystidia and complete lack of clamp connections. They are similar to P. arizonica Burds. et Gilbertson, which possesses much smaller cystidia arising in the subhymenium only and to P. cremea (Bres.) Parm. which also possesses smaller cystidia that are thick walled and usually encrusted. Neither of these is known to possess a Chrysosporium imperfect state.
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