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Page number:618 
Remarks (internal):Entoloma nigellum differs from the other dark-coloured, clampless species in this group by its heterodiametrical spores and smooth pileus.
 
Description:Entoloma nigellum (Quél.) Noordeloos comb. nov.
Basionymum: Eccilia nigella Quél., C. R. Ass. franç. Av. Sci. (Rouen, 1883) 12: 499. 1884; Rhodophyllus nigellus (Quél.) Quél., Enchir. Fung.: 63. 1886
Icon.: Quélet in C. R. Ass. franç. Av. Sci. (Rouen, 1883) 12, pl.6, fig. 6.1884.
Bibl.: Orton in Trans. Br. mycol. Soc. 43: 227. 1960.
Pileus 5-20 mm broad, convex to applanate with blunt to subumbilicate centre, with deflexed margin, hygrophanous, when moist very dark brown to blackish brown, distinctly translucently striate up to half the radius, smooth, glabrous, innately radially fibrillose under lens. Lamellae, L = 8-15, l = 0-3, distant, thickish, often forked and anastomosing, dark grey­brown then reddish brown with entire, concolorous edge. Stipe 10-20 x 1-2.5 mm, cylindrical, concolorous with pileus or with slight blue-black tinge in lowerpart, smooth, glabrous, base white tomentose. Context concolorous with surface. Smell and taste farinaceous.
Spores 9.0-12.2 x 7-9 µm, Q = 1.2-1.5, heterodiametrical in outline, 5-8 angled in side-view. Basidia 4-spored, clampless. Lamella edge fertile. Cystidia absent. Pileipellis a cutis of loosely arranged, radially arranged, cylindrical hyphae, 5-15 µm wide with some slightly ascending, clavate terminal elements, up to 18 µm wide. Pigment brown, encrusting in pileipellis and upper pileitrama, in addition some pale brown intracellular pigment in upper pileitrama. Clamps absent.
Habitat: in coastal sand dunes among scanty vegetation, often with Salix repens; also found on very rotten wood; Aug.-Nov.
Distribution: Rare, but wide-spread in western Europe.

 
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