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Chaetosphaeria capitata

Small separate ascomata phragmospore	Sivan. & H.S. Chang, Mycol. Res. 99(6): 715 (1995)	Sordariomycetidae Chaetosphaeriales
Figure from SMH3239 (Costa Rica)
Genbank Accession: AF466061 (LSU), AF466021 (Btub)

	Complete Description
	Ascomata ovoid to ampulliform, dark brown, 100-260 µm diam., 150-500 µm high,superficial, occurring scattered to clustered with scattered setae. Setae brown, multiseptate, 45-119 x 5-8.5 µm, apex capitate, globose to subglobose, 6-14 µm, with yellow pruina covering apices of setae and on the surface of ascomata. Ascomatal wall opaque in surface view in water, of textura angularis in lactophenol; 15-25 µm thick in longitudinal section. Ascomatal apex papillate, short. Paraphyses sparse, simple, septate, 2.9-3.7 µm wide. Asci cylindrico-clavate, short-stalked, 130-170 x 10.5-16.5 µm, unitunicate, thin-walled, with a distinctive apical ring, with eight bi-triseriately arranged ascospores. Ascospores fusiform, with rounded end cells, 48-100 x 3-5 µm, sub-hyaline to light brown, 7-10 septate. Anamorph: Exserticlava vasiformis (Matsush.) S. Hughes. Conidiophores on CMA, mononematous, macronematous, brown, with few septa, 87-117 x 8-12 µm at the base, 10-12 at the apex. Conidiogenous cell a phialide, obclavate, proliferating percurrently, 72-100 x 10-19 (base) 5.2-8.3 (apex) µm. Conidia on CMA cylindrical to cylindrico-clavate, brown, 3 septate, 19-24 x 10-13 µm. For additional culture characteristics see Fernández and Huhndorf (2005).
	Occurrence
	Found on decorticated wood. Our collections are from Costa Rica and Puerto Rico. The type is from Taiwan. Figure from SMH3239 (Costa Rica)
	Similar Taxa Comments
	Chaetosphaeria capitata has setae on the ascomata that are covered with a distinctive yellow pruina at their apices. This crystalline material was found on both the type material and additional collections made in Costa Rica and Puerto Rico. Ascomata are relatively small and comparable in size to other species of Chaetosphaeria. The uniform pigmentation and the cylindrical to narrowly fusiform shape of its ascospores as well as the Exserticlava vasiformis anamorph link this species to a group of Chaetosphaeria with long, septate ascospores and similar anamorphs.