Dothideomycetes » Dothideomycetes, genera incertae sedis

Chaetosticta

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

Index Fungorum number: IF 7597; Facesoffungi number: FoF 07154, 3 morphological species (Species Fungorum 2022), no molecular data available.

Saprobic or parasitic on the host plant in terrestrial habitat. Sexual morph: Unknown. Asexual morph: Conidiomata pale brown, pycnidial, scattered, superficial, globose to slightly depressed, membranous, unilocular, setose, ostiolate. Ostiole circular, papillate, centrally located. Conidiomatal setae pale brown, subulate, with obtuse apex, unbranched, septate, smooth-walled. Conidiomatal wall composed of thin-walled, brown cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells arising from the innermost wall cells of the conidioma, hyaline, enteroblastic, phialidic, doliiform to ampulliform, determinate, smooth-walled, periclinal thickenings at the collarette zone. Conidia hyaline, cylindrical, with rounded ends, aseptate to several septate, smooth-walled, guttulate (adapted from Sutton 1980).

 

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

 

Notes: Chaetosticta is characterised by superficial, loosely scattered pycnidia, branched, septate, compact, hyaline, cylindrical conidiophores, enteroblastic, phialidic conidiogenous cells and short oblong to oblong-elliptical, aseptate, hyaline conidia. Chaetosticta perforata was previously known as Chaetomella perforata isolated from living leaves of Cirsium discolor. Ellis and Everhart (1885) later renamed C. perforata as Venturia occidentalis. Saccardo transferred V. occidentalis to Acanthostigma as A. occidentale (Lefebvre and Stevenson 1945). Crane (1971) redescribed Chaetosticta and chose a lectotype. Crane (1971) transferred Chaetosticta to Dothideomycetes, genera incertae sedis due to ambiguous morphology. The sexual morph of Chaetosticta is treated in Nematostoma and Lasiostemma (Pseudoperisporiaceae) (Barr 1968; Crane 1971; Kirk et al. 2008; Hyde et al. 2013), but these sexual-asexual links have not been proven by culture or molecular evidence. Li et al. (2020) provided an updated account of Chaetosticta and treated it in Ascomycota, genera incertae sedis. Fresh collections with DNA sequence data are needed to confirm the generic placement of Chaetosticta.

 

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