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Page number:517 
Description type:Non-original description 
Description:PERENNIPORIA ROBINIOPHILA (Murr.) Ryv. comb. nov.
BASIONYM: Trametes robiniophila Murr. North Am. Flora 9:42, 1907.
Fruitbody pileate, sessile, single or more often in imbricate clusters with numerous applanate piles from a common decurrent base, watery and soft when fresh, coriaceous and tough when dry.
Individual pilei 0.5-3 cm thick, up to 15 cm wide and 20 cm long. Pileus white to ochraceous when fresh, pale greyish to unevenly dirty brown on drying, glabrous, slightly sulcate and often with warts and small rounded protuberances. Margin sharp and undulating. Pore surface white when fresh, becoming pale grey to brown when dry. Pores round to angular, 5-6 per mm, sometimes cracked by drying. Tubes concolorous with pore surface and up to 20 mm deep and in dry condition contrasting the white context. Context cottony to corky, white to pale ochraceous, up to 3 cm thick at the base.
Hyphal system dimitic, generative hyphae with clamps, hyaline, 2-4 µm wide, often very difficult to find in dry specimens, skeletal hyphae dominating in trams, and context, unbranched or rarely dichotomously branched, thickwalled to solid, 3-10 µm wide and strongly dextrinoid. Basidia not seen, but reported by Overholts (1953:314), 9-12 µm in diameter. A few cystidiols seen, clavate and up to 20 µm long and 3-5 µm in diameter. Spores subglobose to slightly drop-shaped, Q line, slightly thick-walled and dextrinoid, 5-8(9) x 5-7 µm.
Found on dead and living deciduous trees. Overholts (op. cit.) reports it from Acer, Broussonetia, Celtis, Lirodendron, Morus, Paulownia, Robinia and Quercus in the United States. The collection from Pakistan was collected on living Celtis australis.
Overbolts (op. cit.) reported that Robinia was the most common host, but that it seemingly was best developed on Celtis, i.e. the same host as for the Pakistan collection. The species has not previously been reported from outside the United States and there is no description in Ahmad (1972) and Bakshi (1971) which indicates, at least to me, that the species has been described under a different name. Unless a microscopical examination is carried out the species may easily be mistaken for a Trametes species. Representative specimens:
USA. Virginia: Falls Church, Dec. 1903. On Robinia sp. leg. W. A. Murrill (NY). Type specimen. Tennessee: Great Smokey Mts. Loudon Co. Sugarland camp ground. 6. Sept. 1977. On Robinia sp. L. Ryvarden 14109 (0). Knoxville, leg. H. Hesler 25. Sept. 1933. On living Celtis sp. Overholts coll. no 16252. (DAOM).
INDIA: Punjab, Kasauli. 23. April 1971. Substr. unknown. Leg. R. S. Dhanda. Panjab Univ. Herb. no 6438 (0, ). PAKISTAN: Dapbar, Rest House, 21. Aug. 1981. On living Celtis australis. Leg. S. Ahmad 28120 (0, Ahmad priv. herb.).
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