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Page number:933 
Remarks (internal):Owing to the red colour it may be mistaken for P. incarnata, but is easily distinguished thanks to clear microscopical characteristics. Its place in Peniophora is justified by the red colour of the spores and the aldehydereaction in the gloeocystidia.
The reports by R.L. Gilbertson on the occurrence of Cort. lepidum (Rom.) Bourd. & Galz. in Arizona is based on misdetermined material. It is rather a member of Erytricium, close to E. laetum (Karst.) Erikss. & Hjort. A slide of P. lepida Bres. (Weir 1(1744 FH) has been studied. Spores have not been found but presence of cystidia, gloeocystidia and hyphae with clamps leave no doubt about its identity with P. aurantiaca.
Description type:Non-original description 
Description:Peniophora laurentii Lund. in Lund. & Fig. 464b, 467 Nannf., Fungi exs. suec. n. 1342, 1916. - Merulius lepidus Romell, Ark. bot. 11:3 p. 29, 1911. - Corticium lepidum (Romell) Bourd. & Galz., Hym. de Fr. p. 187, 1928. Non Peniophora lepida Bres., Mycologia 17 p. 70, 1925. = P. aurantiaca Bres.
Holotype: Romell n. 12037 (S).
Fruitbody resupinate, on smooth bark orbicular and adnate but usually confluent-effused, more or less detachable; hymenium at first smooth, then tuberculate, plicate or merulioid, bright orange-red in the fresh fungus, fading in the herbarium to ochraceous red; subiculum white and often forming a white marginal zone; no rhizomorphs.
Hyphal system monomitic; hyphae 3-5 µm wide, without clamps, subicular ones thick-walled, sparsely branched in all directions, forming it White, open texture; subhymenial hyphae thinwalled, richly branched and united into a dense texture, giving the layer a ceraceous membranaceous structure.
Cystidia of two kinds a) encrusted pseudocystidia, in the first layer originating from subicular hyphae, thick-walled with the apical part 40-(i0 x 10- 15 µm, strongly encrusted with an outer layer of grainy crystals and an inner deposit, seemingly also crystalline. Young cystidia thin-walled, subulate, its plasmatic contents with oil-drops or irregular oily inclusions. With the growth of the hymenium new cystidia are formed from subhymenial hyphae b) sulfocystidia, 70-150 x 8-12 µm, thin-walled with grainy plasmatic contents. Basidia 50-60 x 6-8 , narrowly clavate, with 4 sterigmata and without basal clamp. Spores 9-13 x 4-5 µm, broadly cylindrical-narrowly ellipsoid, thin-walled, smooth, pale-red in spore-print.
Habitat. On dead deciduous branches, preferably of Populus tremula and Betula, from late autumn till after snow-melting in the spring. Fruit-bodies are found from October to April, May in C. Sweden, in N. Sweden also in the summer (June-August). It is usually developed under snow and seems to need its protection against the cold winter drought.
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