Pyrenomycetes Species Page

Chaetosphaeria chlorotunicata

Small separate ascomata
Small clustered ascomata
F.A. Fernández & Huhndorf, Fungal Diversity 18: 18. 2005

Figure from MO1038 (Costa Rica), SMH1565, SMH3136 (Puerto Rico)
Complete Description
Ascomata ampulliform to obpyriform, with yellow-greenish coating turning gray with age, 230-407 µm diam., 294-463 µm high, superficial, occurring scattered to clustered in small groups with scattered conidiophores and setae on the ascomata and substrate. Setae dark brown, multiseptate, 135-200 µm long, 5-7.5 µm at the base, tapering to 2.5-3 µm at the apex. Ascomatal wall opaque in surface view, inner wall pseudoparenchymatous, dark brown, 13-20 µm wide, outer coating 4-10 µm wide. Ascomatal apex papillate. Paraphyses sparse, simple, septate, 3.5-5 µm wide. Asci cylindrical, short-stalked, 97-127 x 13-18 µm, unitunicate. Ascospores cylindrical-fusiform, mostly inequilateral, 27-62 x 6-9.5 µm, mostly 7-septate, sometimes 9-septate, dark brown, terminal cells hyaline and short. Anamorph: Exserticlava S. Hughes. Conidiophores mononematous, macronematous, dark brown, on the substrate 223-288 x 6-9 µm for most of their length, widening to 11-13 µm at the apex; on CMA 235-382 µm long, up to 650 µm, 6-7.5 µm at the base, broadening to a single apical, funnel-shaped phialide, 10.5-12 µm wide. Conidia cylindrical, brown, thick-walled, distoseptate, 31-38 x 16-19 µm on the substrate, 22-30 x 10-15 µm on CMA, with a distinctive basal hilum, centric or slightly eccentric. For additional culture characteristics see Fernández and Huhndorf (2005).
Found on decorticated wood and palm petioles. Our collections are from Costa Rica, Jamaica, Panama, and Puerto Rico. Figure from MO1038 (Costa Rica), SMH1565, and SMH3136 (Puerto Rico).
Similar Taxa Comments
This species is recognizable by its ascomata that are yellowish-green when young and become grayish with age and its fusiform, multiseptate, brown ascospores. This species is similar to C. capitata in the morphology of the ascospores and the Exserticlava anamorph. Chaetosphaeria chlorotunicata also bears similarities in ascospore morphology with Chaetosphaeria hiugensis I. Hino growing on bamboo from Japan. In the latter, a subiculum is present and a greenish-gray outer coating in the ascomata is absent (Reblova and Seifert’s 2003, report of this species was from a Puerto Rican collection not from the type). It is also very close to the smaller-spored C. exserticlavoides on bamboo from Thailand.