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Page number:411 
Remarks (public):Being the only species of the genus with encrusted cystidia, it is easily recognized. The spore sculpture is sometimes inconspicuous and difficult to observe. It is as a rule necessary to choose empty spore coats for the study and Melzer's reagent should be used. 
Description type:Non-original description 
Description:Gloeocystidiellum convolvens (Karst.) Donk, Fungus 26 p. 9, 1956; Corticium convolvens Karst., Bidr. Känn. Finl. Nat. Folk 37 p. 148, 1882; Peniophora lundellii Litsch. ap. Lund. & Nannf., Fungi exs. suec. n. 573, Sv. bot. tidskr. 32 p. 288, 1938.
Fruitbody resupinate, effused but moderately large, 0,1-0,5 mm thick, at first adnate, later detachable, white to yellowish, as old pale ochraceous, ceraceous when young and fresh, membranaceous when dried; margin variable, in young specimens more or less fibrillose and often with narrow, white, radiating hyphal strings; hymenium tuberculate, bearing dense, semiglobose warts, which under the lens (50 x) are velvety by the projecting cystidia.
Hyphal system monomitic, hyphae 2-3 µm wide, without clamps, non-cyanophilous; young fruitbodies consisting of a layer of parallel hyphae next to the substrate, ab. 50 µm thick, and a layer of densely united, vertical hyphae and cystidial elements; old specimens stratified (2-3 layers), with thin horizontal layers of hyphae between the strata; in the inner of the hymenial papillae a number of strongly encrusted hyphae (or cystidia) filling the context with crystal matter.
Encrusted cystidia numerous, conically tapering, 40-50 x 6-10 (-12) µm, first naked and thinwalled, then apically encrusted with a layer of rightangled crystals, the encrustation sometimes disappearing from cystidia in old strata.
Gloeocystidia numerous, sinuose, thinwalled, 50-100 x 7-10 (-15) µm, filled with oily, granular, yellowish protoplasm with positive reaction to sulfovanilline.
Basidia narrowly clavate, 20-25 (-30) x 4-5 µm, with 4 sterigmata, no basal clamps.
Spores ellipsoid, verrucose, amyloid, 4-5,5 x 2,5-3,5 µm.
Habitat. G. convolvens occurs on fallen trunks and branches of both conifers and of deciduous trees. In Sweden most collections are made on conifer wood (Picea and Pinus) or on trees that often occur mixed in the conifer forest, e.g. Betula, Salix, and Populus tremula, and the dominant biotope seems to be the Myrtillus-Hylocomium forest, but it is also collected on wood of deciduous trees that normally grow in herb-rich communities, e.g. Alnus and Corylus.
Distribution. Not common but collected several times in North Scandinavia. In Sweden there seem to be no collections S of Uppland. In the subalpine national park of Abisko it is probably rather frequent, judging from the herbarium material. It is likely to occur in all parts of Finland and should be found in the continental areas in Norway.
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