Ascochytopsis
Ascochytopsis Henn., Bot. Jb. 38: 117 (1905)
Ascomycota, genera incertae sedis
Parasitic on the host plant in terrestrial habitat, such as Dolichos kilimandscharicus and Phaseolus lunatus (Fabaceae), or isolated from soil. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, pycnidial, initially closed, then becoming erumpent, cupulate, solitary, superficial, sessile or short-stipitate, globose, unilocular, glabrous. Ostiole absent, dehiscence by irregular split in the apical wall. Conidiomatal wall composed of an out layer of textura globosa with thick-walled, dark brown to pale brown cells, and inner layers of textura angularis with thick-walled, subhyaline cells. Conidiophores arising from the innermost layer of conidiomata, reduced to conidiogenous cells or when present, hyaline, irregular or dolliform, branched at base, septate, smooth-walled. Conidiogenous cells hyaline, phialidic, subcylindrical, integrated, determinate, smooth-walled. Conidia hyaline, fusiform to falcate, apex obtuse, base acute, straight or curved, aseptate, smooth walled (Sutton 1980).
Type species: Ascochytopsis vignae Henn., Bot. Jb. 38: 117 (1905)
Notes: Anaphysmene, Ascochytopsis and Pseudoseptoria have hyaline, fusiform to falcate conidia. Anaphysmene has acervular conidiomata with 0–1-septate conidia, which differs from the pycnidial conidiomata with unicellular conidia in Ascochytopsis and Pseudoseptoria (Sutton 1980). Ascochytopsis was separated from Pseudoseptoria by its phialidic conidiogenous cells. Five species are included in Ascochytopsis (Wijayawardene et al. 2017). There is no molecular data available for this genus.
Distribution: Japan, Zimbabwe (Sutton 1980).
Ascochytopsis vignae (redrawn from Sutton 1980) a Conidia. b Vertical section of conidioma. c Conidiophores,
conidiogenous cells and developing conidia.
Reference:
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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