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Page number:473 
Remarks (public):Microsebacina fugacissima, with its tiny basidia and conspicuous clamp-connexions, is an easily recognized species, though it should be noted that Bourdot & Galzin (1928) described a range of forgotten forms, some of which differed markedly from the type. As noted by Wells (1961), the zigzag appearance of the basidia-bearing hyphae is typical, though also found in Exidiopsis opalea a species which may well be related, despite its much larger basidia. 
Description type:Non-original description 
Description:Microsebacina fugacissima (Bourd. & Galz.) P. Roberts, comb. nov. (Fig. 7A)
Sebacina fugacissima Bourd. & Galz., Bull. Soc. mycol. Fr. 25: 28 (1909). - Exidiopsis fugacissima (Bourd. & Galz.) Sacc. & Trott., Syll. Fung. 21: 452 (1912).
Basidiomes effused, resupinate, thin, ceraceous to subgelatinous, hyaline greyish. Hyphae fairly conspicuous, rather thin, ca 1.5-2.5 µm wide, clamped, forming a branching basidiabearing hymenium. New branches are normally formed at the base of each basidium opposite the clamp-connexion and grow at a slight angle before producing a new basidium. When these short angular growths alternate, a zigzag effect occurs, similar to that seen in Exidiopsis opalea. Hyphidia absent. Basidia 4-septate, ovoid or short-ellipsoid, unusually small, ca 5.5-6.0 x 4.5-5.0 µm, conspicuously clamped, young basidia often with a large open clamp quite out of proportion with the basidium itself. Sterigmata 4 per basidium, tubular, sinuous, rather short, ca 5.0-6.0 µm long. Spores allantoid, 6.0-7.5 x 2.5 µm.
Specimen examined: on fallen wood, Lincombe Slopes, Torquay, Devon (SX 9363), 28 June 1991, P. Roberts 259, K.

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