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 Add this item to the list   Gloeocystidiellum Donk
Page number:35 
Remarks (internal):Worldwide there are currently about 20 epithets in the genus. Many are known from one or a few collections and several will, no doubt, be transferred to other genera when either they are better known or when the genera subdivided from Gloeocystidiellum are better known.
Relatively recent descriptions (Eriksson and Ryvarden 1975, Jülich and Stalpers 1980, Parmasto 1968) of Gloeocystidiellum were based upon the broad concept of the genus, which encompassed most of the segregate genera. However, Jülich (1984) recognized the segregate genera Boidinia, Megalocystidium, Scytinostromella and Vesiculomyces. The distinguishing characters of Gloeocystidiellum sensu stricto are: 1) amyloid, finely verrucose, relatively small (less than 10 µm long) basidiospores, 2) narrowly clavate, relatively small (to 25 x 4 µm), four-spored basidia, 3) monomitic hyphal system, 4) thin-walled, narrow (2-3 µm diam) hyphae, 5) gloeocystidia (often sulfo-positive), and 6) effuse, relatively thin (to 260 µm thick) basidiomes. We accept six species as part of the North American mycoflora.
Description type:Non-original description 
Description:Gloeocystidiellum Donk
Meded. Ned. Mycol. Ver. 18-20: 156, 1931; emend. Donk, 1956, Fungus 26: 8; emend. Parmasto, 1968, Systematis Corticiacearum, p. 134.
Type species Corticium porosum Berk. & M.A. Curtis
Basidiomes effuse, typically several cm long and broad, thin to 0.8 mm thick, crustose, membranous, in age some deeply fissured, yellow, pale yellow, buff, pallid to tan, lignicolous or corticolous. Hymenial surface smooth, but conforming to the topography of the substrate. Subiculum pallid to white, thin. Hyphal system monomitic. Generative hyphae typically arranged in a narrow layer parallel to and adjacent to the substrate, then becoming perpendicular to the substrate and slightly woven between the gloeocystidia and developing hymenium, with or without clamp connections, 2-6 m diam, the walls hyaline, thin or moderately thickened in some species, nonamyloid, acyanophilous. Gloeocystidia cylindric, fusoid or swollen basally, sinuous, typically 40-230 x 6-22 µm; the walls hyaline, thin; the contents oily to granular and pale yellow in KOH, sulfo-positive or sulfo-negative. Lamprocystidia in one species. Basidia cylindrical to slenderly clavate, about 17-40 x 4-7 µm with four sterigmata. Basidiospores ellipsoid, mostly broadly ellipsoid, about 4-6 x 3-5 µm, the walls hyaline, thin, amyloid, acyanophilous, finely verrucose to warty, with a minute apiculus.
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