Mastigosporella Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1, 123: 135 (1914)
Sordariomycetes, Sordariomycetidae, Diaporthales, Cryphonectriaceae
Foliicolous on plants, such as Anisophyllea sp. (Anisophylleaceae), Nyssa biflora and N. sylvatica (Nyssaceae), Quercus coccinea (Fagaceae). Sexual morph: see Senanayake et al. (2018). Asexual morph: Conidiomata yellowish brown to dark brown, pycnidial, scattered to gregarious, immersed to erumpent, oval to irregular in section view, unilocular, glabrous, ostiolate. Ostiole single, papillate, centrally located. Conidiomatal wall composed of thick-walled, pale brown to hyaline cells of textura globulosa to textura angularis in the base and lateral part, becoming darker towards ostiolar region. Conidiophores arising from the innermost layer wall cells of conidiomata, mostly reduced to conidiogenous cells or present, hyaline, sparsely septate and branched, invested in mucus. Conidiogenous cells hyaline, enteroblastic, annellidic, lageniform to subcylindrical, discrete or occasionally integrated, indeterminate, smooth-walled. Macroconidia hyaline or pale brown, narrowly ellipsoid to fusiform, with a narrow truncate base, unicellular, smooth-walled, guttulate, bearing an unbranched, attenuated apical appendage arising as a tubular extension of the conidium body. Microconidia hyaline, cylindrical to clavate with a rounded or blunt apex and a narrow truncate base, unicellular, smooth-walled (Nag Raj 1993, Crous et al. 2018a).
Type species: Mastigosporella hyalina (Ellis & Everh.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1, 123: 135 (1914)
Notes: Nag Raj and DiCosmo (1981a) and Nag Raj (1993) re-described Mastigosporella and accepted two species, M. hyaline on leaves of Quercus coccinea (Fagaceae) from the USA and M. nyssae Nag Raj & DiCosmo on leaves and petioles of Nyssa sylvatica (Nyssaceae) from Georgia. They also listed the presumed sexual morph as Wuestneiopsis J. Reid & Dowsett (Reid and Dowsett 1990, Nag Raj 1993). Crous et al. (2013) added a third species, M. anisophylleae Crous, on Anisophyllea sp. (Anisophylleaceae) from Zambia, which has larger conidia than other Mastigosporella species. Crous et al. (2013) also showed Mastigosporella was related to Cryphonectriaceae instead of Wuestneiopsis (Melanconidaceae), based on LSU and ITS sequence data. Rossman et al. (2015) added an additional species M. georgiana (J.H. Mill. & G.E. Thomps.) Rossman & Crous based on Gnomoniella georgiana J.H. Mill. & G.E. Thomps. Crous et al. (2018a) add the fourth species, M. pigmentata V.P. Abreu & O.L. Pereira which has pale brown conidia and placed Mastigosporella in Harknessiaceae. Senanayake et al. (2018) described the sexual morph of Mastigosporella and placed this genus in Cryphonectriaceae. Mastigosporella and Harknessia were considered to be closely related (Nag Raj and DiCosmo 1981, Senanayake et al. 2018). We checked the description and illustration of these two genera and found that they are totally different in conidial form. Mastigosporella has hyaline to pale brown, narrowly ellipsoid to fusiform, aseptate conidia with attenuated apical appendages. On the other hand, Harknessia has brown, globose to subglobose, aseptate conidia or are variable in shape, with or without longitudinal bands, bearing a cellular, cylindrical to subcylindrical, basal appendage, occasionally with an apical appendage (Nag Raj 1993).
Distribution: Brazil, USA and Zambia (Nag Raj 1993, Crous et al. 2013, 2018).
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