Pseudoseptoria Speg., Anal. Mus. nac. B. Aires, Ser. 3 13: 388 (1911)
Facesoffungi number: FoF 00134
Dothideomycetes, Dothideomycetidae, Dothideales, Saccotheciaceae
Saprobic or parasitic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata brown to dark brown, pycnidial, scattered to gregarious, immersed to erumpent, globose in section view, unilocular, glabrous, ostiolate. Ostiole single, circular, centrally located. Conidiomatal wall composed of thin-walled, pale brown cells of textura angularis. Conidiophores reduced to conidiogenous cells. Conidiogenous cells formed from the innermost layer of wall cells of the conidiomata, hyaline, enteroblastic, annellidic, subcylindrical to ampulliform, indeterminate, smooth-walled, with numerous inconspicuous or conspicuous percurrent proliferations towards apex. Conidia hyaline, falcate, fusiform, tapered towards each end, unicellular, smooth-walled, guttulate (adapted from Sutton 1980).
Type species: Pseudoseptoria donacis (Pass.) B. Sutton, Mycol. Pap. 141: 169 (1977)
Notes: Pseudoseptoria species are plant pathogens on Poaceae (Slopekl and Labun 1992, Carmona et al. 1996, Sutton 1980, Quaedvlieg et al. 2013). The genus is characterized by pycnidial conidiomata, annellidic conidiogenous cells and falcate, fusiform conidia. Sutton (1980) revised the genus and accepted five species, P. bromigena (Sacc.) B. Sutton, P. donacis (Pass.) B. Sutton, P. everhartii (Sacc. & P. Syd.) B. Sutton, P. obtusa (R. Sprague & Aar.G. Johnson) B. Sutton, P. stomaticola (Bäumler) B. Sutton. An additional species P. usneae (Vouaux) D. Hawksw. was later added (Hawksworth 1981). Quaedvlieg et al. (2013) included molecular data and placed Pseudoseptoria in Dothioraceae. They also introduced two new species, P. collariana Quaedvl., Verkley & Crous and P. obscura Quaedvl., Verkley & Crous. Wijayawardene et al. (2018) placed Pseudoseptoria in Saccotheciaceae, and accepted eight species in the genus. Fresh collections of the generic type P. donacis are needed to confirm its placement.
Distribution: Canada, Cyprus, Ethiopia, Hungary, Iran, Ireland, Libya, Pakistan, UK, USA (Sutton 1980, Quaedvlieg et al. 2013).
Pseudoseptoria donacis (redrawn from Sutton 1980) a Conidia. b Conidiogenous cells and developing conidia.
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.