Chaetosticta
Chaetosticta Petr. & Syd., Annls mycol. 23(3/6): 270 (1925)
Dothideomycetes, genera incertae sedis
Saprobic or parasitic on the host plant in terrestrial habitat. Sexual morph: undetermined. 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 (Sutton 1980, Morgan-Jones et al. 1986).
Type species: Chaetosticta perforata (Ellis & Everh.) Petr. & Syd., Annls mycol. 23(3/6): 270 (1925)
Notes: Crane (1971) revised Chaetosticta and designated a lectotype on undersurface of leaves of Cirsium discolor (Asteraceae) for its generic type, C. perforata. The genus was re-described and re-illustrated by Sutton (1980) and Morgan-Jones et al. (1972e). Four taxa are listed in Index Fungorum (2019), but, apart from type species, other taxa have not been re-examined. The sexual morph of Chaetosticta has been assigned to Nematostoma Syd. & P. Syd. and Lasiostemma Theiss., Syd. & P. Syd. (Pseudoperisporiaceae) (Barr 1968, Crane 1971, Kirk et al. 2008; Hyde et al. 2013), but these connections have never been successfully demonstrated by culture studies or other evidence. Thus, we place Chaetosticta in Ascomycota, genera incertae sedis until molecular data is available.
Distribution: Australia, Chian, Brazil, India, Italy, Japan, Malaysia, New Zealand, Romania, Spain, UK, USA, (Sutton 1980, https://www.gbif.org/).
Chaetosticta perforata (a, c, e, f redrawn from Sutton 1980, b, d, g from Morgan-Jones et al. 1972e) a Surface view of a conidioma. b Vertical section of conidioma. c, d Conidiogenous cells and developing conidia. e Conidiomatal seta. f, g Conidia.
References:
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.
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