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Mycena meliigena (Berk. & Cooke) Sacc.

Syll. Fung. 5: 302 (1887)

© A. Aronsen 2005


On (usually moss-covered) bark of various living deciduous trees. Autumn to winter. Widely distributed in Southern Norway, however not very common. See The Norwegian Mycology Database.

Pileus 5-10 mm across, hemispherical, parabolical to convex, often somewhat flattened or depressed centrally, sulcate, translucent-striate, pruinose, vinaceous red, brownish pink, dark violet, pale brown with a lilaceous tinge, turning more brownish at age. Lamellae 6-14 reaching the stipe, broad, the edge convex, ascending to subhorizontal, adnate, more or less decurrent with a short tooth, at first concolorous with the pileus, pallescent, turning whitish, finally more or less sepia grey-brown, the edge paler. Stipe 4-20 x 0.2-1 mm, curved, pruinose to white-floccose, glabrescent, becoming shiny, more or less concolorous with the pileus, the base densely covered with long, white fibrils. Odour none.

Basidia 30-36 x 10.5-13.5 µm, clavate, 4-spored, clamped or 2-spored, clampless. Spores from 4-spored basidia 8-11 x 8-9.5 µm, from 2-spored basidia up to 14.5 µm, Qav ~ 1.1, globose to subglobose, amyloid. Cheilocystidia 15-40 x 6-14 µm, occurring mixed with the basidia, clavate, clamped or clampless, covered with unevenly spaced, simple to branched, curved to tortuous excrescences up to 12.5 µm long. Pleurocystidia absent. Lamellar trama dextrinoid, vinescent in Melzer’s reagent. Hyphae of the pileipellis 2.5-9 µm wide, covered with warts or cylindrical excrescences. Hyphae of the cortical layer of the stipe diverticulate, the terminal cells up to 80 µm long, usually slender, clavate, diverticulate.

M. meliigena and Mycena pseudocorticola Kühner can often be found growing together on the same trunk. M. pseudocorticola seems to be more common. Young, fresh specimens of the two species are not difficult to separate, but with age they both turn more brownish and can be hard to identify macroscopically. Microscopically they are very similar too. Maas Geesteranus (1982a) pointed at a quite reliable character to tell them apart in the shape and size of the terminal cells of the stipe cortex. In M. pseudocorticola these cells are stubby, not longer than 37 µm, whereas much longer, more slender, cells are by far the more common kind in M. meliigena.

The brown colours in older specimens may cause confusion with M. supina (Fr.) P. Kumm., but that species have cheilocystidia with only short excrescences. M. juniperina Aronsen has a pale yellowish brown pileus and grows on Juniperus communis.

Go to key to sect. Supinae.

 


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Further images on the web:

Yves Deneyer

Yves Deneyer 2

Yves Deneyer 3

Mycologie en Catalogne nord

 

© Arne Aronsen 2002-2015