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Remarks (internal):Ceratosebacina longispora is a macroscopically inconspicuous species, microscopically distinguished by its tremelloid basidia, clamp connexions, and elongated fusiform spores. Ceratosebacina calospora is very similar, but lacks clamp connexions. Ceratobasidium calosporum has identical spores, but lacks clamp connexions and possesses holobasidia. Tulasnella deliquescens also has similar spores, but is otherwise distinct. 
Description type:Non-original description 
Description:Ceratosebacina longispora (Hauerslev) P. Roberts, Mycol. Res. 97: 470 (1993). Figures 57 & 58
Sebacina longispora Hauerslev, Friesia 11: 100 (1976).
Exidiopsis longispora (Hauerslev) Woj., Mala Flora Grzybow 2: 107 (1981).
Teleomorph. Basidiome: often sparse and invisible to the naked eye; when visible, effused, ceraceous, smooth, dull pale grey. Hyphae. 2.5-4.5 µm diam., thin-walled, with clamp connexions. Conidiophores: simple, phialide-like, only seen in culture following spore germination; microconidia produced terminally, in succession (Ingold, 1992). Microconidia: small, globose, 1.5 µm diam., only seen in culture (Ingold, 1992). Basidia: 2-4 celled, globose to ellipsoid, often showing hyphal growth through the basidia and then appearing angular, cuboid, or papillate, 10-12 µm wide, sometimes with a short, often lateral stalk; base of basidia with conspicuous clamp connexion; new basidia or hyphal growth often emerging from this basal clamp connexion. Sterigmata: normally short, 5-10 µm long, Ceratobasidium-like, but occasionally much longer, sinuous, Exidiopsis-like. Basidiospores: elongated fusiform (Q= 5.2-9.0), normally sinuous or obtusely angled at mid-point, 18-44 x 2.5-5 µm, sometimes producing secondary spores, germinating by germ tube normally arising at mid-point.
Anamorph. Not known, though Ingold (1992) shows Rhizoctonia-like, monilioid hyphae arising from germinating basidiospores.
Habitat & ecology. Collected on fallen wood. Saprotroph.
Distribution. Europe: Balearic Islands (K; Roberts, 1996); Belgium (K); British Isles (K; Roberts, 1993b); Denmark (C; Hauerslev, 1976); France (PC); Norway (K; Roberts, 1997b); North America: USA (K; McGuire, 1941, as Sebacina calospora; Wells, 1961, as Exidiopsis calospora).
Type specimen. Denmark: Ermelunden, on dead wood, 15 Nov. 1964, K. Hauerslev 2044, C, holotype.
Additional illustrations. Hauerslev (1976, as Sebacina longispora); Ingold (1992, spore germination, as Exidiopsis longispora); McGuire (1941, as Sebacina calospora); Roberts (1996; 1997b); Wells (1961, as Exidiopsis calospora).
 
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