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Page number:243 
Description type:Non-original description 
Description:Microsebacina fugacissima (Bourdot & Galzin) P. Roberts, Myc. Res. 97: 473 (1993)
Sebacina fugacissima Bourdot & Galzin, Bull. Soc. Myc. Fr. 25: 28 (1909) Exidiopsis fugacissima (Bourdot & Galzin) Sacc. & Trott. Syll. Fung. 21: 452 (1912)
Type specimen examined: France: Aveyron: St Estève, on Quercus, 5 May 1915, A. Galzin 17914 (H. Bourdot 14916), (lectotype) PC.
Sebacina fugacissima has been variously interpreted. A cytological study of S. fugacissima by Whelden (1935) described a species with myxarioid basidia and acute cystidia, presumably Stypella subhyalina. Most specimens under the name Sebacina fugacissima at K are either Stypella grilletii or S. subhyalina (as cited under these names above). Authentic specimens from the Bourdot herbarium are equally diverse. A collection labelled 'f. subtypica' (unpublished) is Stypella grilletii. An additional specimen (Bourdot 5163, PC) labelled 'f. typica' is collapsed, but lacks clamp connexions and may possibly be the taxon now known as Microsebacina microbasidia (M.P. Christ. & Hauerslev) P. Roberts. A specimen labelled 'f. communis subspicata' (cited above) represents Sebacina fugacissima as interpreted by Wells (1961) and Roberts (1993), and is here selected as the lectotype of the species. Microsebacina fugacissima has small, non-myxarioid basidia and lacks hyphidia. It is not closely related to Stypella.
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