Cap 6-25 mm across, obtusely conical or convex to campanulate, without or with obtuse umbo, smooth to shallowly sulcate, translucent-striate, hygrophanous, olive green to olive brownish or olivaceous yellow-green to dingy yellowish grey-green, sometimes with the centre more brownish or slightly fulvous, and the margin very pale greyish green to pale yellowish or of a bright citrine, fading considerably on drying out and turning ochraceous greenish yellow, pale olivaceous yellow or brownish yellow. Gills (14-)16-22 reaching the stem, adnate (sometimes rather narrowly) to emarginate , ± decurrent with a tooth, dingy whitish or very pale greyish brown to pale yellowish grey-green, the edge pale yellow to citrine or greenish yellow to greenish, finally concolorous with or even paler than the sides. Stem 15-50 x 1-2 mm, ± rooting, hollow, fairly firm, equal or slightly broadened below, smooth to subfibrillose, pruinose or minutely puberulous above, glabrous for the greater part, slightly shiny, pale grey-brown or dingy yellowish grey-green to fairly dark grey tinged olive green, at the apex whitish or pale greyish; base with long, coarse, flexuous, pale greenish to whitish fibrils. Odour indistinctive or somewhat chemical when fresh, but pronouncedly of iodoform on drying out. Basidia 23-41 x 8-12 µm, clavate, 4-spored, with sterigmata up to 9 µm long. Spores (8-)9-11 x 5.2-6.5(-7) µm, ± ellipsoid to pip-shaped, Q=1.4-1.6, Qav=1.56, amyloid. Cheilocystidia 15-50 x 8-22 µm, clavate to obpyriform, sometimes sublageniform to almost cylindrical, with hyaline to pale green to yellowish contents, covered with fairly few, evenly spaced warts or cylindrical excrescenses 1-6 x 0.5-1.5 µm, more rarely entirely smooth, and sometimes with much longer and broader, branched excrescences. Pleurocystidia similar, if present. Lamellar trama dextrinoid. Hyphae of the pileipellis 2-4.5 µm wide, covered with warts or cylindrical excrescences 0.5-7 x 0.5-1.5 µm, which tend to grow into much longer, very branched, densely coralloid masses; terminal cells clavate, smooth or covered with excrescences Hyphae of the cortical layer of the stem 2-3.5 µm wide, sparsely covered with warts or cylindrical excrescences 0.5-7.5 x 1-1.5 µm. Clamps present in all tissues.
Ecology and distribution
Mostly associated with Ammophila in dune grassland. Occuring late autumn. Rare.