Hemimycena delectabilis (Peck) Singer -

Descripción original
Description: Pileus 416 mm broad, conical to campanulate, more or less distinctly umbonate at centre, with inflexed to slightly involute margin when young, expanding to broadly conical or campanulate, with obtuse, flattened or slightly depressed centre, finally flattened, becoming slightly depressed at centre, with straight to slightly reflexed margin, which may become crenulate or lacerate when old, hygrophanous, translucently striate up to centre, white, with slightly watery greyish or yellowish tinge at centre when moist, white when dry, usually finely tomentose (lens), sometimes glabrous. Lamellae distant, L = 12-20 (30), | = (0) 1-2, arcuate to triangular, broadly adnate to distinctly decurrent, well-developed, usually reaching the pileus margin, interyvenose when old, white, with concolorous, finely pubescent edge. Stipe 7 45 «x 0.5—1.5 mm, cylindrical, slightly broadened at apex. cylindrical to very slightly broadened at base, hyaline, white to yellowish, entirely finely hairy, with well-developed basal rhizoids. Context concolorous with surface. Smell strong, nitrous, especially when bruised. Taste bitter, Spores 7.0 9.0 (9.5) x (3.5) 4.5-5.5 (6.0) um, BE 1.4-2.1,Q = 1.7-1.9, ellipsoid, broadly ellipsoid. cllipsoid-fusoid, thin-walled, smooth, hyaline. Basidia (25) 28-32 «x 7.0 10.0 jim, 4-spored, clavate. Basidioles 13-30 x 2.5-10.0 um, clavate to cylindrical. Hymenial cystidia numerous, (30) 37-52 (65) x 8,0--16 pum, lageniform to fusoid, with rounded, sometimes irregular or subeapitate apex, thinwalled. ‘Trama made up of cylindrical, up to 30 (40) jim wide, thin-walled, sometimes branched, ellipsoid or fusiform elements, Pileipellis a cutis of radially arranged, + thin-walled, slightly gelaunised, up to 7 jum wide diverticulate hyphae; diverticulae digitate, obtuse, often branched, up to 25 x 2.0-4.0 tn long. Pileocystidia absent. Stipitipellis a cutis of parallel, cylindrical, slightly thickwalled. up to 7 wm wide hyphae with hyaline to pale vellowish walls in KOH. Cauloeystidia 30-65 x 9.9-5.0 (10.0) pum, lageniform, fusoid or cylindrical and capitate, with rounded, sometimes irregular to subcapitate rostrum, sometimes irregular, slightly thick-walled. Clamp-connections present. Chemical reactions: Neither spores nor tissucs amyloid or dextrinoid.
Ecology: Saprotrophic, mostly in groups, on vegetal debris (grass remnants, herbs, also on very rotten wood (e.g. derostis, Cirsium spinosissinum, Epilobium angustifoliun, Lolium perenne, needles of Abies, Juniperus, Picea, Pseudotsuga menziesii), a variety of habitats, such as short grassland on (rather) dry, weakly acid to subneutral, moderately humose sand (ARNOLDS 1981), in Juniperus scrub, also on dacaying leaves in Tilio

Fuente de la foto: http://www.aranzadi.eus/micologia/h