Camarophyllopsis olivaceogrisea

Description. Basidiomata small-sized. Pileus 7 - 12 mm broad, hemispherical, convex to plano-convex at first, then gradually applanate, becoming depressed at disc when mature, non-striate to weakly striate; margin slightly inflexed at first, soon straight, slightly crenate or lacerate when mature; surface matt, velvety, hygrophanous, greenish gray (or olive gray) to dull green (27 D 2 - 30 D 2, 27 D 3 - 30 D 3, 27 E 2 - 30 E 2, 27 E 3 - 30 E 3), often paler at margin. Flesh 1 - 3 mm thick in the stipe, white to grayish white, unchanging when exposed. Lamellae 1 - 2 mm deep, L = 20 - 34, l = 1 - 3, short to moderately decurrent, white to weakly grayish white (1 A 1 - 1 B 1) at first, white to weakly greenish white (27 A 2 - 30 A 2) when mature, unchanging when bruised; edge entire, concolorous with the sides. Stipe 13 - 25 x 1.5 - 2.5 mm, central, cylindrical and becoming narrower downwards; glabrous and shiny, hardly tomentulose or pruinose, hygrophanous, white to greenish white at first (28 A 1 - 28 A 2, 29 A 1 - 29 A 2), becoming greenish white to light greenish gray (28 A 2 - 28 B 2, 29 A 2 - 29 B 2) when mature and in dry condition. Odor none. Taste mild. Basidiospores [60 / 2 / 2] 4 - 5.5 (- 6) x 3.5 - 4.5 (- 5) μm, av. 4.6 x 3.8 μm, Q = (1.12) 1.14 - 1.28 (1.43), av. Q = 1.21 + / - 0.08, broadly ellipsoid, hyaline, smooth, inamyloid, thin-walled. Basidia 4 - spored, occasionally 2 - spored, (10 -) 15 - 26 (- 30) x 5 - 7 μm, av. 24.5 x 5.8 μm, hyaline, narrowly clavate, attenuated and flexuous toward base, sterigmata up to 4 μm long. Basidioles cylindrical to narrowly clavate, often flexuous, obtuse, (18 -) 20 - 37.5 (- 40) x 6 - 8 μm, av. 23 x 6.8 μm. Pleurocystidia absent. Marginal cells on the lamellar edges not well differentiated, similar to basidioles on lamellar sides. Lamellar trama composed of sub-parallel or occasionally interwoven and irregularly inflated hyphae (23 -) 35 - 50 (- 104) x 4 - 8 (- 10) μm, av. 46.5 x 7 μm. Pileipellis a cutis of numerous repent branched hyphal 4 - 8 μm wide, with terminal chains of ellipsoid or cylindrical cells. Pileus trama composed of cylindrical and occasionally branched hyphae (23 -) 35 - 50 (- 70) x (4 -) 6 - 10 μm, av. 45.5 x 7.6 μm. Stipitipellis formed of parallel, thin-walled and narrow hyphae 3 - 8 μm diam. Caulocystidia not observed. Clamp connections absent in all tissues.