Hemimycena subimmaculata (Murrill) Elborne & Læssøe -

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Description: Pileus 2-8 mm broad. broadly conical with acute centre, with involute margin, expanding to convex with or without slightly depressed centre, with deflexed margin, white, not to distinetly translucently striate nearly to centre, smooth or slightly rugulose, glabrous. Lamellae distant, L=10 14,1 0-1, long-decurrent, well-developed and usually reaching the margin of the pileus. rather narrow, white with concolorous edge. Stipe 10-20 x 0.3-0.5 mm, very stender, eylindrical, slightly broadened at apex and/or base, hollow, white, appearing glabrous or minutely whitish-pruinose (lens), without basal rhizoids, Context thin, white, Smell and taste not distinctive. Spores (9.0) 10-14.5 (15) x (3.5) 4.0-5.0 (5.5) pm, E 2.1-3.5,0=2.6-3.1, fusiform, sulacrymoid, hyaline. Basidia 24-33 x (0.0) 7.5-9.0 um, 4-spored, clavate. Basidioles 10-33 x 4.0-9.0 pm, cla vate, cylindrical. Hymenial eystidia 21-35 x 5.0 7.0 um, fusiform, subfusiform. rarely sublageniform or subeylindrical, often rostrate, obtuse to subacute, sometimes with a mucronate cap, thin-walled. Trama made up of eylindrical, fusiform, ellipsoid to subglobose, thin-walled, up to 25 pun wide elements. Pileipellis a cutis made up of radially arranged, eylindrical, + tuin-walled, diverticulate, up to $ um wide hyphace: diverticulae up to 11 x 2.0 pim, digitate, eylindrical, obtuse, often irregular or sometimes branched: with scattered cystidioid terminal elements, 12-40 x 4.5-6.0 pm, clavate, cylindrical, subfusoid, + thin-walled, often with a mucronate slime cap. Stipitipellis a cutis of parallel, eylindrical, slightly thick-walled, smooth or sometimes diverticulate, up to 5 um wide hyphae. Caulocystidia 15-65 x 2,5-7.0 pm, cylindrical, clavate, sublageniforomr awl-shaped, often branched or irregular (especially at base), slightly thick-walled, sometimes with a mueronate cap. Clamp-connections present in all tissues. Chemical reactions: Neither spores nor tissues amyloid or dextrinoid. Ecology: Saprotrophie. on dead leaves and stems of Petasites. on fallen leaves of A/nus, Salix and Corvlus, and on dead parts of ferns (A/ivritm, Drvopreris), n subalpine copses of Pinus mugo stands of various deciduous trees (A/ts, Salix and Corv/ts),