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Page number:296 
Remarks (internal):Entoloma triste can be recognized by its very dark colour, intracellular pigment and heterodiametrical, irregularly angled spores. Entoloma undulatumsporum is close, but differs by size and shape of the spores (see below). 
Description type:Non-original description 
Description:Entoloma triste (Velen.) Noordel. (tav. 73b, fig. 134)
Nolanea tristis Velen., Ceske Houby: 630. 1921; Entoloma triste (Velen.) Noordel. in Persoonia 10: 254.1919.
Bibl.: Noordeloos in Persoonia 10: 254. 1979, Noordeloos in Persoonia 10: 509. 1980; Noordeloos in Bas & al., Fl. agar. neerl.,Vol. 1: 139, fig. 131. 1987.
Holotypus: J. Velenovsky, May 1920, Krc, Bohemia, Cecoslovacchia (PRC).
Pileus 10-20 mm broad, conical finally expanding to convex with small papilla, with deflexed margin, hygrophanous, when moist blackish brown, not translucently striate or very obscurely so at margin only, pallescent on drying to moderately dark brown, radially fibrillose to subrugulose. Lamellae, L = 15-30, l = 0-3, adnate-emarginate to almost free, distant, ventricose, greyish-ochraceous then dark greyish pink, with concolorous, entire edge. Stipe 15-40 x 1-3 mm, cylindrical, yellow-brown to horn brown at apex, downwards greyish brown, but paler than pileus, white tomentose at base, glabrous, polished. Smell none. Taste mild.
Spores 10.0-12.5 x 7.0-9.0 µm, Q = 1.2-1.6, irregularly 6-8-angled in side-view. Basidia 4-spored, clamped. Lamella edge fertile. Cystidia absent. Pileipellis a cutis of narrow, 4-10 µm wide, cylindrical hyphae. Pigment abundant, brown, intracellular in pileipellis. Clamps abundant in hymenium, elsewhere rare.
Habitat: solitary or in small groups usually on more or less acid soils in grassy vegetations and heaths, also on peat or among Sphagnum; may-oct.
Distribution: Wide-spread, but very rare in Europe.

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