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Literature:
 
Page number:163 
Description type:Non-original description 
Description:Entoloma chalybaeum (Fr.: Fr.) Noordel. in Nord. J. Bot. 2: 163. 1982.
Agaricus chalybaeus Fr., Observ. mycol. 2: 93. lS18; Agaricus chalybaeus Fr.: Fr., Syst. mycol. 1: 203. 1821; Leptonia chalybaea (Fr.: Fr.) Kumm., Führ. Pilzk.: 96. 1871.
Misappl. - Agaricus colombarius sensu Sow., Col. Figs. Engl. Fungi 2: pl. 161. 1799.
var. chalybaeum - Fig. 175.
Sel. icon. - Bres., Iconogr. mycol. 12: pl. 574. 1929.
Sel. descr. & figs. - Noordel. in Persoonia 12: 205-206, tig. 5. 1984.
Pileus 14-40 mm. conical or campanulate, sometimes truncate, usually not or only slightly depressed at centre, with involute margin, not very much expanding with age, not hygrophanous, not translucently striate, rarely striate up to one-third of radius, dark indigo-blue, almost black at centre, towards margin slightly paler. becoming more brownish blue with slight violaceous sheen with age, entirely tomentose breaking up in minute, radially arranged, adpressed to slightly reflexed squamules, sometimes glabrescent with age; sometimes radially sulcate at margin. Lamellae, L = 20-40. I = 1-5, moderately distant, deeply emarginate to almost free, ventricose, grey violaceous or blue violaceous when young, then greyish pink with entire, brownish edge. Stipe 20-50 x 2-3.5 mm, cylindrical with slightly to distinctly broadened base, sometimes compressed with groove, dark grey-blue, usually slightly to distinctly paler and brighter than pileus, minutely pruinose at apex, downwards glabrous, polished or with minute white tomentose patches; base white tomentose. Context concolorous with surface, white in innermost part of pileus and stipe. Smell none. Taste none or slightly bitter.
Spores 8.5-12.5 x 6.5-8.5 µm, Q = 1.2-l.75, Q av. 1.45, ellipsoid in side-view with 6-9 angles and dihedral base. Basidia 27-51 x 8.5-14 µm, 4-spored, clampless. Lamella edge entirely sterile. Cheilocystidia 35-75 x 5-18 µm, cylindrical to clavate, often with pale brown intracellular pigment. Pileipellis a trichoderm, at centre almost a hymeniderm made up of clavate up to 35 µm wide elements. Pigment brownish blue, intracellular in pileipellis and upper pileitrama. Brilliant granules usually present in pileitrama. Clamp-connections absent.
Habitat & distr. - In small groups in poorly manured, semi-natural grassland on loamy or sandy soil. Widespread in W. Europe; rare. Aug.-Oct.
 
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