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Page number:467 
Remarks (internal):The restricted description proposed above essentially returns the genus to its original concept as a resupinate counterpart of Exidia Fr. Species lacking a detectable hymenium are now excluded, as are species clearly lacking hyphidia.
For the moment, Sebacina is retained as a similar but separate genus lacking clamp-connexions on the hyphae. Species possessing sphaero-pedunculate myxarioid basidia are provisionally referred to Myxarium Wallr. and allied genera, though it should be noted that some extra-limital Exidiopsis species, including E. laccata (Bourd. & Galz.) Luck-Allen and E. diversa Wells, produce occasional myxarioid basidia. Species referred to Basidiodendron Rick produce a succession of basidia on continually extending stalk cells and are well-differentiated from Exidiopsis. Species placed in Eichleriella Bres., on the other hand, are rather similar, differing mainly in their macroscopic morphology. Bourdotia (Bres.) Trott., having lost most of its species to Basidiodendron, is now a relict genus of uncertain affinity.
At present only four Exidiopsis species have been reported from Britain, three of which have been found in Devon and are described here. The fourth species, Exidiopsis calcea (Pers.) Wells, has been frequently confused with E. effusa and its occurrence in Britain requires confirmation. The majority of extra-limital species currently assigned to Exidiopsis have conspicuous fruit bodies, possess hyphidia, and should almost certainly be retained within the genus. New combinations are provided for the minority, mostly European, which are clearly to be excluded.
 
Description type:Non-original description 
Description:Exidiopsis (Bref.) Mill., Bot. Mitth. Trop. 8: 167 (1895).
Basidiomes effused, resupinate, corticioid to ceraceous or subgelatinous. Hyphae with clamp-connexions, forming a distinct, branching, basidia-bearing hymenium normally in a gelatinized matrix. Hyphidia usually thin and nodulose or branched, present at the hymenial surface, but often becoming gelatinized and indistinct in older specimens. Basidia comparatively large, usually ovoid to ellipsoid, septate, occasionally short-stalked, always clamped at the base. Sterigmata tubular, often sinuous, extending almost indefinitely to reach the hymenial surface. Spores normally allantoid, frequently replicating, germinating by one or more germ tubes.
Type species: Exidiopsis effusa (Bref. ex Sacc.) Möll.
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