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Page number:67 
Description type:Non-original description 
Description:Grifola frondosa (Fr.) S. F. Gray Figure 7 Heim, Cahiers du Pacifique n. 6 (1964) 128; Ryvarden (1976) 187; Jülich (1984) 327; Sato, Osawa, Suzuki and Oikawa, Trans. mycol. Soc. Japan 25 (1984) 205; Gilbertson & Ryvarden (1986) 332.
Fruit-bodies in tufts -14 cm high, 20 cm wide, stipitate, multipileate. Pileus -14 cm wide, ascending, flabelliform, often lobed and branching, fuscous greyish mouse colour, finely scurfy pruinose towards the undulate margin, pale subochraceous and thinly fuscous scurfy pruinose towards the base. Stem -14 x 1-2 cm, solitary or caespitose, dividing into several pilei, cream then light cinnamon ochraceous with white apex. Tubes -2.5 mm long, decurrent, white; pores 0.2-0.5 mm wide, angular, often incomplete, white to pale cream. Flesh thick, subfibrous, tough in the old parts, white, ochraceous brownish at the base of the stem. Smell of mushrooms.
On stumps and dead trunks. North Temperate, Borneo, New Guinea.
Spores 5.2-6 x 4-5 µm, white, smooth, obovoid, opalescent, I-ve. Basidia 28-34 x 5-6.5 µm, clamped; sterigmata 4, 3.5 µm long. Cystidia and hyphal pegs none. Hymenium compact, not thickening. Hyphae monomitic, clamped, inflating in the stem and pileus and becoming copiously secondarily septate with cells 15-300 x 4-35(-45) µm without clamps, the walls thickening -1 µm in the stem and older part of the pileus, longitudinal and interwoven into a fairly compact tissue, even the clamps inflating, not encrusted, I-ve; in the dissepiments 1.5-3.5 µm wide, long-celled, clamped at most septa with rather sparse secondary septa, the walls thin or slightly thickened, longitudinal, compact, not agglutinated. Surface of pileus and stem with a rather disrupted pile of cylindric to clavate thick-walled hyphal ends -110 x 4-11 µm with stalks 3-5 lam wide, oblique or divergent, the younger hyphal ends towards the margin of the pileus with brownish grey sap. Margin of the pileus with hyphae 2-4 µm wide, clamped throughout, inflation with secondary septation beginning c. 3 mm behind the growing margin and continuing for a considerable space, even in the mature stem with the production of new hyphae, the rows of secondarily septate cells becoming contorted on enlargement. Oleiferous hyphae 3-10 µm wide, with opalescent oleaginous contents, frequent in all parts.
Collections: Borneo, mt Kinabalu, Mesilau 1600 m alt., 1 April 1964, RSNB 8047, on a rotten trunk.
This is the description of the Bornean collection. The microscopic details agree with collections that I have made in England. The species is associated with a white rot in temperate countries. The Japanese authors, cited above, report on the artificial culture of the species which does not readily fruit under such conditions.

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