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Page number:495 
Remarks (internal):Entoloma corvinum is one of the most splendid species of Leptonia because of its dark black blue pileus and strongly contrasting pale pink lamellae. It can therefore not be confused with E. chalybaeum, that has sordid blue or grey lamellae, and E. serrulatum, that has a black blue lamella edge. Entoloma mougeotii differs in having paler, violaceous grey colours.
Description type:Non-original description 
Description:Entoloma corvinum (Kühner) Noordel. (tav. 55, fig. 225)
Rhodophyllus corvinus Kühner in Rev. Mycol. 19: 4. 1954 (Compl. Fl. anal. 1); Leptonia corvina (Kühner) P. D. Orton in Trans. Br. mycol. Soc. 43: 177. 1960; Entoloma corvinum (Kühner) Noordel. in Nord. J. Bot. 2: 162.1982.
Interpr. err.: Rhodophyllus lampropus sensu J. Lange., FL. agar. dan. 2, pl. 76c. 1937. Entoloma decolorans sensu Moreno in Int. J. Mycol. Lich. 3: 289-290.1984 non Horak.
Icon.: Lange, FL. agar. dan. 2, pl. 76c. 1937 (come R. lampropus); Noordeloos in Beitr. Kenntn. Pilze Mitteleur. III, apposite p. 168. 1987; Vesterholt in Svampe 21: pl. 18. 1990.
Bibl.: Kühner in Rev. Mycol. 19: 42-43. figs 10d, e, 11. 1954 (Compl. Fl. anal. 1); Noordeloos in Beih. Nova Hedwigia 91: 231-234, fig. 76. 1987; Noordeloos in Bas & al, Fl. agar. neerl.,Vol. 1: 165, fig. 178. 1987; Noordeloos in Beitr. Kenntn. Pilze Mitteleur. lll: 171. 1987; Vesterholt in Svampe 21: 27.1990.
Pileus 5-40 mm broad, conical or hemispherical, then convex, usually truncate and slightly depressed at centre, rarely deeply umbilicate, with involute then deflexed margin, not hygrophanous, not translucently striate, dark blue-black or indigo, uniformly coloured, not pallescent, entirely tomentose or velutinous, breaking up in minute squamules with age. Lamellae, L = 25-35, l = 2-5, moderately crowded, emarginate with decurrent tooth or adnate, segmentiform to narrowly ventricose, purely white then pink with irregular, concolorous edge. Stipe 30-70 x 1.5-4 mm, cylindrical or compressed with longitudinal groove, often broadened towards base, concolorous with pileus at first, becoming paler and tinged violaceous with age, minutely fibrillose-striate all over with darker fibrils, white tomentose at base. Context concolorous with surface in cortex, paler in inner parts. Smell and taste indistinctive.
Spores 8.0-11.0(-11.5) x 6.0-7.5(-8.0) µm, Q = 1.1-1.6, 5-7-angled in side-view. Basidia 4-spored, clampless. Lamella edge sterile. Cheilocystidia 20-60 x 5-15 µm, cylindrical to clavate. Pileipellis a transition between a cutis and a trichoderm at margin, more like a trichoderm at centre, made up of inflated terminal elements, 30-80 x 15-30 µm. Pigment blue, intracellular in pileipellis. Clamps absent.
Habitat: in semi-natural grasslands with mosses, and in subalpine meadows; also found in montane Fagus forest on calcareous soil under or near Mattheucia struthiopteris and in moist places in Pinus-forest. June-Oct.
Distribution: Wide spread but rare, all over Europe, from the lowlands up into the subalpine zone.

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