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Page number:486 
Remarks (internal):The differences between var. chalybaeum and var. lazulinum are very small, and mainly base upon the translucently striate, less distinctly squamulose pileus of var. lazulinum. Therefore it has been impossible to maintain both taxa on specific level. If more observations should prove that intermediate forms exist, even the varietal level would be impropriate. 
Description type:Non-original description 
Description:Entoloma chalybaeum var. lazulinum (Fr.) Noordel. (tav. 53b, c)
Agaricus lazulinus Fr., Epicr.: 153. 1838; Leptonia lazulina (Fr.) Quél. in Mém. Soc. Emul. Montbéliard, sér. II, 5: 344. 1872 (Champ. Jura Vosges l); Rhodophyllus lazulinus (Fr.) Quél., Enchir. Fung.: 60. 1886; Entoloma lazulinum (Fr.) Noordel. in Nord. J. Bot. 2: 162. 1982; Entoloma chalybaeum var. lazulinum (Fr.) Noordel. in Persoonia 12: 206. 1984. Entoloma chalybaeum var. lazulinum forma bisporigerum Noordel. in Persoonia 12: 208. 1984. Agaricus glaucus Bull. ex DC., Fl. franç. 2: 179. 1805 non Agaricus glaucus Batsch 1786.
Interpr. err.: Rhodophyllus cyanulus sensu J. Lange, Fl. agar. dan. 2, pl. 77F. 1937.
Icon.: Bresadola, Icon. mycol. pl. 570/2. 1929; Lange, Fl. agar. dan. 2, pl. 77F. 1937 (come Rhodophyllus cyanulus); Phillips, Mushr. other Fungi: 117. 1981 (come Leptonia lazulina); Ryman & Holm˴sen, Svampar: 383.1984; Vesterholt in Svampe 21, pl. 14a. 1990.
Bibl.: Noordeloos in Beih. Nova Hedwigia 91: 221-224, figs. 70,71. 1987; Noordeloos in Bas & al, Fl. agar. neerl.,Vol. l: 164, fig. 176. 1988; Vesterholt in Svampe 21: 26. 1990.
Pileus 5-40 mm broad, conical to campanulate, sometimes truncate, expanding to convex or plano-convex with age, slightly to distinctly depressed, but never really umbilicate, with involute then deflexed or straight margin, not or slightly hygrophanous, when moist translucently striate up to half or three quarter of radius, bright blue, ultramarine, or indigo, blackish blue at centre, paler at margin, entirely velutinous or tomentose when young, later on granulose or minutely squamulose in central part, slightly pallescent on drying, shining. Lamellae, L = 10-30, l = 3-7, moderately distant, adnate-emarginate to almost free, segmentiform to ventricose, sometimes transvenose, blue, ultramarine or indigo when young, then with pink tinge, with entire, brown, rarely concolorous edge. Stipe 20-70 x 1-4 mm, cylindrical or compressed with longitudinal groove, often broadened at base, dark blue, ultramarine, indigo or violaceous-blue when young, usually more or less concolorous with pileus, pallescent with age, and then often with glaucous tinges in lower part, minutely pruinose at apex, downwards smooth, polished, with white tomentose base. Context intensely blue in cortex, pale blue in inner parts of pileus and stipe. Smell indistinctive. Taste mild or slightly oily-rancid.
Spores 8.5-12.0 x 6.5-8.5 µm, Q = 1.2-1.7, heterodiametrical, 5-9 angled in side-view (9.0­13.5 x 7.0-9.5, Q = 1.2-1.6 in two-spored forms). Basidia 4-spored, rarely 2-spored, clampless. Lamella edge sterile. Cheilocystidia 30-75 x 5-20 µm, cylindrical to clavate, often with brown, intracellular pigment. Pileipellis a cutis with transitions to a trichoderm, made up of inflated terminal elements, 10-30 µm wide. Pigment intracellular in pileipellis. Clamps absent.
Habitat: Among grass and moss in semi-natural grasslands, meadows and pastures, from the lowlands up into the alpine zone. June-Nov.
Distribution: Wide-spread, not uncommon, all over Europe.

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