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Page number:136 
Remarks (public):Entoloma ventricosum belongs to the complex of E. cetratum in which it is unique because of the small spores, greyish colour, thickish, transvenose lamellae, and 4-spored, clamped basidia. 
Description type:Non-original description 
Description:Entoloma ventricosum Arnolds & Noordel. in Persoonia 10: 298. 1979. - Fig. 126.
Sel. icon. - Arnolds & Noordel. in Fung. rar. Ic. col. 12: pl. 93c. 1981.
Sel. descr. & figs. - Arnolds & Noordel. in Fung. rar. lc. col. 12: 20-21, fig. 16. 1981; Noordel. in Persoonia 10: 502-503. 1980.
Pileus 13-24 mm, bluntly conico-convex to flattened with weak umbo and slightly inflexed margin. slightly hygrophanous, when moist grey-brown at centre, with pale grey-brown, sometimes sharply delimitated marginal zone, often with slight ochraceous tinge. translucently striate up to centre with dark brown striae, pallescent on drying with radial streaks to very pale ochraceous grey, glabrous. Lamellae, L = 15-18, 1= 1-3, rather distant, somewhat thickish, strongly ventricose, transvenose, pale greyish pink then dark brown-pink (K. & W. 6C5), with flesh-coloured edge (6B4). Stipe 30-48 x 2-3.5 mm, cylindrical often slightly flexuose, solid then narrowly fistulose, pale ochraceous grey-brown to rather dark grey-brown (5C5, 6C5, 6E6), smooth, minutely striate lengthwise. on drying more distinctly striate, white tomentose at base. Context very thin in pileus, fibrillose-brittle, concolorous with surface, except pallid inner part of stipe. Smell none. Taste not distinctive.
Spores (8.5-)9.0-11.0(-11.5) x 7.0-8.5 µm, Q = 1.15-1.4, Q av. = 1.25, acutely 5-6-angled in side-view. Basidia (28-)30-40 x 9-14 µm, 4-spored, clamped. Lamella edge fertile. Cystidia absent. Pileipellis a cutis of narrow, cylindrical hyphae. 4-8 µm wide; subpellis not distinct. Pigment pale brown, intracellular in pileipellis and pileitrama. Clamp-connections abundant in hymenium, absent in trama.
Habitat & distr. - Solitary or in small groups in poorly manured meadows on fairly dry, weakly acid. humus-rich sand. Very rare (Rolde). Also known from one locality in France. May and Sept.
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