Phloeomana hiemalis (Osbeck) Redhead

Index Fungorum 289: 1 (2016)

= Mycena hiemalis (Osbeck) Quél. in Mém. Soc. Émul. Montbéliard, Sér. 2, 5: 110 (1872)

© A. Aronsen
VESTFOLD, Tjøme, Hvasser, Sønstegård 29 Nov. 2003.

On moss-covered trunks of deciduous trees, e. g. Fagus, Salix, Ulmus. Summer to winter. Widespread and common in the area covered, but becoming rare in Northern parts of Scandinavia. In Norway fairly common in southern parts.

Pileus 2-10 mm across, campanulate, conical, sometimes becoming convex to applanate, with or without a small papilla, shallowly sulcate, translucent-striate, glabrescent, very variable in colours, fairly dark brown with the centre blackish brown, turning paler brown with age or at first pale grey-brown and dark brown at the centre, paler with age, becoming very pale brown to beige, mostly darker at the centre, sometimes entirely white, the margin usually white. Lamellae 8-14 reaching the stipe, ascending, narrowly to more broadly adnate, pale grey to white. Stipe 10-35 x 0.5-1 mm, hollow, curved, terete, equal, pruinose or minutely puberulous, glabrescent except for a pruinose apex, white, occasionally yellowish towards the base with age, the base covered with long, coarse, flexuous white fibrils. Odour and taste indistinctive.

Basidia 25-35 x 6-7 µm, clavate, 2-spored (rarely 4-spored). Spores 7-9.5 x 5.2-7 µm, Q 1.1-1.5, Qav~1.3, broadly pip-shaped, smooth, non-amyloid. Cheilocystidia 30-55 x 9-15 µm, forming a sterile band, fusiform to utriform, smooth, usually broadly rounded. Pleurocystidia similar, if present. Lamellar trama weakly dextrinoid. Hyphae of the pileipellis 2-4 µm wide, sparsely diverticulate, covered with usually simple, more rarely furcate, cylindrical, straight to curved excrescences 2-9 x 1-3 µm. Hyphae of the cortical layer of the stipe 2-6 µm wide, smooth, terminal cells (caulocystidia) 12-55(-64) x 4-24 µm, variously shaped, generally inflated, smooth. Clamps absent in 2-spored form, present in 4-spored.

Microphotos of cheilocystidia, pileipellis and caulocystidia

Phloeomana hiemalis was formerly recognized as a a member of Mycena sect. Hiemales. Usually it can be recognized by the growth on moss-covered trunks of deciduous trees, the usually pale pileus generally with a brownish centre, and the ascending, narrowly adnate lamellae. It can, however, sometimes be confused with P. alba or with P. minutula. P. alba can be distinguished by the hyphae of the pileipellis that are covered with scattered, coarse, inflated, simple or broadly lobed excrescences, and by the globose spores. P. minutula differs in having a whitish pileus with a yellowish centre, smooth hyphae of the pileipellis and somewhat differently shaped cheilocystidia. Dark brown specimens of P. hiemalis can be confused with Mycena erubescens, but the latter is easily separated on account of pointed pleurocystidia, reddening flesh and bitter taste.

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© Arne Aronsen 2002-2023