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Page number:299 
Remarks (public):Polyporus umbellatus Pers.:Fr. also has a profusely branched basidiocarp but differs in having many centrally stipitate pilei, cylindric basidiospores and binding hyphae. Meripilus giganteus differs in haying simple-septate generatiye hyphae. a fibrous consistency. and pale brown colouration from the very beginning and blackening when bruised in fresh condition.
Grifola frondosa is often collected for its taste and is said to be an excellent edible species. In Japan it is cultivated for this purpose.
Description type:Non-original description 
Description:Grifola frondosa (Dicks.:Fr.) S.F. Gray. - Nat. An. Brit. Plants 1:643, 1821. - Boletus frondosus Dicks.. Plant Crypt. Brit.. fasc. 1:18. 1785. - Polyporus frondosus Dicks.:Fr.. Syst. Mycol. 1:355, 1821. Basidiocarps annual. stipitate, compound. entire structure up to 40 cm wide, stipe much branched from a thick base, cream colored, up to 10 cm or more in diam at the base, giying rise to large numbers of imbricate. fan-shaped or flabelliform and often confluent pi lei up to 8 cm wide and 8 min thick; upper surface pale lavender-gray at first, becoming darker and finally a dull dark brown on older specimens. azonate, very finely tomentose to glabrous. smooth or radiately rugose, margin concolorous, thin, often undulate or curled under; pore surface ivory white. the pores angular, 2-4 per mm. with thin, lacerate dissepiments, context ivory white, up to 2 mm thick in individual pilei, up to several cm thick at base and in main branches of stipe. tube layer decurrent on the stipe, often extending to the ground line, distinct from context. pale tan on older dried specimens, brittle and shattering easily when dried. up to 5 mm thick:, odor pleasant. nutlike. Hyphal system dimitic; contextual generative hyphae hyaline, thin-walled, with clamps, rarely branched, 2.5-5 µm in diam; contextual skeletal hyphae moderately thick-walled, nonseptate, with infrequent branching, 2.5-6 µm; tramal generative hyphae similar, but more frequently branched.
Cystidia or other sterile hymenial elements lacking.
Basidia clavate, 4-sterigmate, 22-35 x 7-8 µm. with a basal clamp.
Basidiospores oyoid to ellipsoid, hyaline. smooth, negative in Melzer's reagent. 6-7 x 4-4.5 µm.
Type of rot. White rot and butt rot of living trees.
Cultural characteristics. See Davidson et al. 1942; Nobles 1948. 1958, 1965; Stalpers 1978.
Substrata. Fruiting on the ground from roots at the base of living hardwoods and conifers. Particularly common on Quercus but also on Acer, Betula, Carpinus. Castanea, Fagus and Ulnuus. Fruiting may continue at the base of dead trees and stumps. Distribution. A rare species throughout Europe north to the southern parts of the Scandinayian peninsula. Circumpolar in the Northern hemisphere.
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