Mycena romagnesiana collected in the Bieszczady Mts

Mycena romagnesiana maas Geest. (agaricales, Mycenaceae) is a rare fungus, associated with deciduous forest, occurring especially on beech stumps and logs. a special search was made for the presence of new Mycena species on decaying wood of Fagus, especially in the mountains, between 1996-1999 and 2002-2006. the investigations were particularly intensive in nature reserves and national parks. numerous Mycena specimens resembling Mycena galericulata as well as two specimens later identified as Mycena romagnesiana were collected. the majority of the specimens either were determined as M. galericulata (2-spored) or still remain undetermined (= cfr M. galericulata 2-spored but the shape of the spore is conspicuously different).

preserved with standard methods, and were deposited in Herbarium (Kram-F) in w. szafer institute of Botany, Polish academy of sciences.microscopic features were studied in KoH (5%) with Phloxin and using melzer's reagent.the colours of different parts of the fruit body in exsiccates were described using the munsell soil color charts (anonymous 2000) and maerz Paul (1930).
the macroscopic description of the species was adapted from maas Geesteranus (1991) and romagnesi (1978) and supplemented with the author's observations on the dry material.microscopic details are based on examinations of the collections presented below.
the map of distribution M. romagnesiana contains localities from literature reports, examined material and internet.Pileus 20-50 mm, pale grayish, brownish to pale orange brownish, centre darker, margin paler to white, glabrous, not translucent-striate, rugulose at margin, conical to campanulate with conspicuous umbo, flattened with age, in dry specimens even depressed.Lamellae moderately crowded, adnexed with a tooth, broad (up to 5.5 mm), creamy white, when dry (specimens examined) darker with conspicuous white edge.Stipe 50-10 x 3-6 mm, bright cream, base frequently rooting, always with white tomentum, dry with shine.smell fruity, test indistinctive, not farinaceous.
Habitat. in the mountains, gregarious, on a decayed stump of Fagus.

Final rEmarKs
Mycena romagnesiana is a rather rare species in Poland and other European countries.Based on literature resources this species in known to be connected with beech wood and can be found in mountains.this means that its distribution may be determined by climate and the occurrence of old natural forests.Further investigations are necessary, especially in the western tatra massive and in sudety mts.macroscopically, the present species is easily mistaken with more variable M. galericulata.Both species are clearly differentiated only by microscopic characters.M. romagnesiana is 4-spored, hyphae of the pileipellis are sparsely covered with rounded warts, hyphae of stipitipellis are smooth or with very sparse cylindrical excrescences, while spores are broader and shorter than spores of M. galericulata.Perhaps even better than the ornamentation of hyphae of the pilei-and stipitipellis, the shape of the cheilocystidia may serve to distinguish both species.cheilocystidia of M. romagnesiana have fewer excrescences then these of M. galericulata.microscopical reexamination of herbal material of Mycena galericulata, from beech wood especially, my supply new localities of M. romagnesiana in Poland.