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Page number:28 
Remarks (internal):An extensive account of this fungus is given by Weber in Mycologia 21:113-130. 1929, and its pathological effects are described by Davidson and others in U.S.D.A. Tech. Bul. 785, µm. 41. 1942, by Davidson and Campbell in Mycologia 46:234-237. 1954, and by Fritz in Canad. Jour. Bot. 32:545-548 and 799-817. 1954. µm; butt rot of yellow birch in Nova Scotia is attributed to this species, see Rev. Appl. Mycol. 34:115 and 35:796. It has been found on the roots of pine, associated with the little leaf disease, see Jackson in Phytopathology 35:98-105. 1945. This fungus, whose Sclerotium is identified as Pachyma hoelen Rumph, is considered a weak parisite of pine and mulberry in Japan, and its Sclerotium is utilized as a medicine and as food, see Rev. Appl. Mycol. 9:572 and 13:657.
This species has a peculiar hyphal structure shared only by Poria inflata and P. dictyopora (Cooke) Cooke from Australia (P. wakefieldiae Cleland a probable synonym). P. dictyopora appears to differ in having spores 6-7 x 4-5 µm. P. in flata differs in having smaller pores, 3-5 per mm, and smaller spores 4-5 x 2.5-3.5 µm.
Description type:Non-original description 
Description:Poria cocos (Schw.) Wolf Fig. 13 Elisha Mitchell Sci. Soc. Jour. 38:134. 1922. Sclerotium cocos Schw., Naturf. Ges. Leipzig Schrift. 1:56. 1822. Poria magnahypha Overh., Pa. Agr. Exp. Sta. Tech. Bul. 418:31. 1942 (PAC; BPI; SYRF).
Annual, "at first in isolated round patches which may reach 12 cm in diam" (Overholts), these sometimes confluent, up to 7 mm thick, adnate, without taste or odor; margin white to pale brown, membranous or velvety, at extreme edge fimbriate, often wide, up to 20 mm broad; pore surface white to pale brown, dull, the tubes "tough and cartilaginous" (Wolf) when fresh, corky or resinously impregated and fragile when dry, up to 5 mm long, the pores angular, variable, 1-3 per mm or some larger, edges becoming thin, usually more or less fimbriate; context whitish to cream next to the tubes, below darker, sometimes distinctly brown, firm, fibrous to corky, up to 2 mm thick, continuing without change into the trama.
Sections not changing color in KOH; hyphal system dimitic, the context principally of generative hyphae which are rarely to often branched, with thin to much thickened walls, apparently nonseptate or sometimes frequently simple-septate, mostly 3-8 (-12) in diameter, and also with much enlarged septate hyphae up to 29 µm in diameter; hyphae often gelatinizing more or less in KOH, and with some skeletal hyphae which are similar except not over 7 µm in diameter; trama continuous with the context, the hyphae usually thin-walled, simple-septate, 3-7 µm in diameter; hymenium 20-30 µm thick; cystidia none; basidia slender-clavate, 14-30 x 6-9 µm; spores hyaline, smooth, IKI -, subcylindric or fusoid to oblong-ellipsoid, 6-11 x 2.5-3.5 (-4.5) µm.
Forming large sclerotia in the ground; rarely found fruiting on wood of gymnosperms or less often of angiosperms, in Ont., N.H., N.Y., Pa., Md., D.C., N.C., Ga., Fla., Ala., Tenn., Mo., Sask., Idaho, Wash., Ore., and Cal.; associated with a brown rot.
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