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Page number:430 
Remarks (public): Megalocystidium was described by Jülich (1978) to include the Gloeocystidiellum luridum and G. lactescens groups proposed by Eriksson & Ryvarden (1975). The genus thus defined, included species with smooth basidiospores, SA+ gloeocystidia, clamped (G. luridum group) and clampless (G. lactescens group) species. Hjortstam (1987) pointed out that the main features of Thelephora lactescens Berk. were in agreement with those of Gloiothele lamellosa (Henn.) Bres., the type species of Gloiothele, and subsequently regarded as the appropiate genus for the G. lactescens group. Thus, Megalocystidium is including only clamped species in the sense of Wu (1996). 
Description type:Non-original description 
Description:Megalocystidium Jülich, Persoonia 10: 139, 1978.
Basidiome resupinate, effused, membranaceous to ceraceous, hymenophore smooth, margin byssoid or thinning out. Hyphal system monomitic, hyphae with clamps, hyaline, cylindrical to torulose, more or less thin-walled. Gloeocystidia present, long, flexuous, with oily contents or granular, SA+. Basidia narrowly clavate, hyaline, with 4-sterigmata, a basal clamp present or lacking. Basidiospores cylindrical to ellipsoid, smooth (or minutely ornamented), hyaline, more or less thin-walled, amyloid, acyanophilous.

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