Dothideomycetes » Dothideomycetes, genera incertae sedis

Chaetosticta

Citation: Pem D et al. (2019) Mycosphere Notes 275-324: A morphotaxonomic revision and typification of obscure Dothideomycetes genera (incertae sedis). Mycosphere 10(1), 1115–1246

 

Chaetosticta Petr. & Syd., Annls mycol. 23(3/6): 270 (1925)

= Pyrenochaeta subgen. Trichocicinnus Sacc., Annls mycol. 3(6): 512 (1906) [1905]

 

= Trichocicinnus (Sacc.) Höhn., in Weese, Ber. dt.bot. Ges. 37: 159 (1919)

 

Endophytic or pathogenic on lower surface of living leaves of dicotyledon plants. Sexual morph: Undetermined. Asexual morph: Pycnidia superficial, loosely scattered, roundish to subglobose, papillate, black, sparingly clothed with straight, translucent olive brown continuous, bristle-like hairs of equal in length to the diameter of the conidiomata, more thickly set around the orifice, paler and more or less substellate-tufted below, easily removed from the host surface. Conidiophores branched, septate, compact, hyaline, cylindrical, tapered towards the apex, smooth-walled. Conidiogenous cells enteroblastic, phialidic, with minute collarette, discrete or integrated, cylindrical, tapered towards the apex. Conidia numerous, very dense, small, very variable from short oblong to oblong-elliptical, aseptate, hyaline, constricted at septa, truncate to pointed at base, light brown to olivaceous brown, thick and smooth-walled, with one to many oil droplets.

 

Type species – Chaetosticta perforata (Ellis & Everh.) Petr. & Syd.

 

Notes – The genus Chaetosticta was introduced by Petrak & Sydow (1925) for the type species Chaetosticta perforata which was named as Chaetomella perforata isolated from living leaves of Cirsium discolor. Later, Chaetomella perforata was found to be an ascomycete by Ellis & Everhart who renamed it as Venturia occidentalis (Sutton 1980). In another work, Saccardo transferred Venturia occidentalis to Acanthostigma occidentale (Ellis & Ev.) Sacc (Lefebvre & Stevenson 1945). In 1971, the genus Chaetosticta was redescribed by Crane (1971) and a lectotype was chosen. It was then transferred to Dothideomycetes, genera incertae sedis due to its uncertain morphological characters (Kirk et al. 2013, Wijayawardene et al. 2018). The sexual morph is unknown. Cultures and sequence data are unavailable. We re-examined the isotype specimen of Chaetosticta perforata from S herbarium under the code F49139. Morphological characters of Chaetosticta perforata are similar to Pyrenochaeta erysiphoides Sacc. In this study, we synonymise Chaetosticta perforata (≡Chaetomella perforata Ellis & Everh 1885) and Pyrenochaeta erysiphoides as all the three species share similar morphological characters and all of them were collected from the same hosts (Cirsium sp.). We believe that all these three fungi are the same but retain the genus Chaetosticta in Dothideomycetes, genera incertae sedis.

 

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