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Page number:1215 
Remarks (public):Close to Plicatura nivea but easily distinguished by the radially folded hymenium. The species was from this characteristics referred to Cantharellus by Fries, later by him to Trogia Fr. The species was, however, not included in the original description of Trogia and this genus is nowadays typified in such a way that it does not include P. crispa. Reid treated it among Cyphellaceae, used in a wide sense. He also supposed a relationship to Merulius tremellosus. We think that it rather is a link in an evolution from the Corticiaceae (Amylocorticium, Ceraceomyces) over Plicatura to Plicaturopsis. These two genera represent different adaptions, the former to more humid conditions, the latter which has firmer and drought-enduring fruitbodies to drier biotopes. 
Description type:Non-original description 
Description:Plicaturopsis crispa (Fr.) Reid l.c. - Cantharellus crispus Pers. ex Fr., Syst. mycol. I p. 323, 1821. - Merulius crispus (Fr.) Fr. loc. cit. (synonym); Syst. mycol. 3, index p. 116, 1832, - Trogia crispa (Fr.) Fr., Monogr. Hym. Suec. p. 244, 1863.
- Plicatura crispa (Fr.) Rea, Brit. Basid. p. 626, 1922. - Plicatura faginea Karst., Bidr. Känned. Finl. Nat. Folk 48 p. 342, 1889.
Fruitbody usually dimidiate, flabelliform or cupulate, mostly crowded-imbricate, without stipe or with the fruitbody narrowed into a short, stipe-like part (pseudostipitate), depending on the situation of the substrate, on undersides of horizontal substrate subresupinate, more or less lobed, on vertical sides laterally fixed; diameter 1-2 cm, seldom more; young fruitbody white but upperside soon becoming pale brown to tobacco-brown, finely velutinous, often subzonate; hymenial side white-glaucous white, darkening in old specimens and in the herbarium, folded in dichotomously branched gill-like ridges with uneven-crispate edge; consistency of the young fruitbody soft, pliable, when mature fruitbody firmer, when dried brittle.
Hyphal system monomitic, hyphae 3-5(-7) µm wide with large clamps, often with a conspicuous "eye"; subhymenial hyphae 3-5 µm, richly branched; tramal hyphae 3-5 µm, mainly parallel, hyphae of the upperside ab. 5-7 µm wide, coarse, thick-walled (somewhat swelling in KOH and Melzer, best studied in cotton-blue); ends of such hyphae form the tomentum of the upperside, in old fruitbodies more or less glued together, forming composed bristles.
Cystidia none.
Basidia subclavate-subcylindrical, 15-22 x 3.5-4.5 µm, with 4 sterigmata and basal clamp, forming a dense hymenial palisade.
Spores allantoid, 3-4.5 x 0.75-1.25 µm, exceptional spores somewhat larger, thin-walled, smooth, with oily contents, amyloid reaction in some specimens clear, in others weak or even difficult to observe, especially as the number of spores is often small and the spores very narrow. The oily contents give them a tint of green that can hide the reaction.
Habitat. On dead, corticate trunks and branches in. N. Europe preferably of Corylus and Fagus but is found also on other substrates, e.g. Betula, Alnus, Tilia, Prunus and Aesculus. There are also reports about it growing on living wood.
Distribution. Southern species, in N. Europe not rare in Denmark and S. Sweden but rarer in S. Norway and still rarer in S. Finland, but it has in Norway an isolated locality as far north as Alta in Finnmark. O. Andersson has mapped the Scandinavian distribution (Friesia 3. p. 139, 1945). It has not been possible to verify the most northern Swedish collection. The specimen does not seem to exist in the Swedish herbaria, and it cannot therefore be excluded that it is Plicatura nivea.
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