Mycena mirata (Peck) Sacc.

Syll. fung. (Abellini) 5: 290 (1887)

© A. Aronsen 2004

On moss-covered trunks of deciduous trees, or on fallen twigs and litter of various trees, both deciduous trees and conifers. Often found among needles under Juniperus communis. One single specimen of a perfectely white form was collected by A. Aronsen on grass near a beach in Vestfold (Maas Geesteranus, 1991b: 550). Summer to late autumn. Locally quite common but probably overlooked. In Norway widespread in southern parts but also recorded north to Finnmark.

Pileus 2-7 mm across, hemispherical, conical to parabolical, often more or less depressed in the centre, and sometimes with a small papilla, sulcate, translucent-striate, pruinose, glabrescent, fairly dark brown at the centre, paler brown or grey-brown towards the margin, or pale grey to whitish, paler to almost white towards the margin, sometimes entirely white (see remark). Lamellae 9-15(-17) reaching the stipe, ascending, narrowly to more broadly adnate, with or without a short tooth, pale grey to whitish, occasionally somewhat intervenose, the edge convex. Stipe 10-35 x 0.2-0.5 mm, hollow, terete, equal, curved or flexuous, entirely pruinose or minutely puberulous, glabrescent, shiny, whitish to grey above, greyish to dark brown below, sometimes entirely white, the base covered with or fastened to the substratum by long, white fibrils. Odour none.

Basidia 18-24 x 6-9 μm, clavate, mostly 2-spored, but some 1-spored, with plump sterigmata up to 11 μm long. Spores 9.2-12.2 x 4.5-6.5 μm, Q 1.3-2.5, Qav ~ 1.9, elongated pip-shaped, almost cylindrical, smooth, amyloid. Cheilocystidia 15-30 x 8.5-22 μm, making the lamellar edge a sterile band, clavate to obpyriform, densely covered with cylindrical excrescences 0.5-4 x 0.5-1 μm. Pleurocystidia absent. Hyphae of the pileipellis 2-10 μm wide, densely covered with warts or short cylindrical excrescences. Hyphae of the cortical layer of the stipe 1.5-4 μm wide, fairly sparsely covered with cylindrical excrescences0.5-3 x 0.8-1.5 μm, terminal cells little differentiated, diverticulate, at the base of stipe appearing as caulocystidia 4-12 μm wide, clavate, diverticulate. Clamp connections present in all tissues.

Mycena mirata belongs to sect. Filipedes. Its characterizing features are the small size, the small number of lamellae reaching the stipe, the hyphae of the pileipellis, which are densely covered with warts, the 2-spored or 1-spored basidia, the elongated shape of the spores, and the presence of clamp connections.

In the literature M. mirata is only described as 2-spored, and all my own collections have been 2-spored. A collection made by M. Krikorev, Sweden, however, proved to have 4-spored basidia.

Sometimes perfectly white specimens of M. mirata can be encountered, especially when they grow on litter among fallen leaves and more or less covered by the leaves, typically under Salix caprea. Then it can be mistaken for Mycena terena, a species with smooth cheilocystidia.

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Microphotos of cheilocystidia



Go to sect. Filipedes.

Further images on the web:

Mycologie en Catalogne nord


© Arne Aronsen 2002-2023