Ascochyta Lib., Pl. crypt. Arduenna, fasc. (Liège) 1(Praef.): 8 (1830)
Synonym: Heracleicola Tibpromma et al., Fungal Divers. 75: 58. 2015
Indexfungorum number: IF7239; Facesoffungi number: FoF ****
Sexual morph: Ascomata pseudothecial, immersed to erumpent, mostly subglobose or flattened occasionally irregular, solitary to aggregate, ostiolate, sometimes developing an elongated neck. Asci subcylindrical to subclavate, or saccate, slightly curved, bitunicate, 8-spored, short-stipitate. Pseudoparaphyses filamentous, septate, thin-walled, hyaline, conspicuous fructifications (lacking with the maturity). Ascospores ovoid to ellipsoidal, somewhat biconic, hyaline to yellowish into the asci, become brown when released, smooth, 1 and 3 septate, constricted at the septa, symmetrical or asymmetrical, uni-biseriate. Asexual morph: Conidiomata pycnidial, superficial or immersed (in agar), ampulliform to mammiform or subglobose, occasionally irregular, solitary to aggregate, ostiolate, poroid opening form at the end of the growing. Pycnidial wall pseudoparenchymatous, several layers (1–8), pigmented outer wall. Conidiogenous cells annellidic or phialidic, smooth, hyaline, vary with shapes, ampulliform, cylindrical, doliiform, flask-shaped, obpyriform and subglobose. Conidia vary with shapes shape, allantoid, cymbiform, ellipsoidal, oblong, ovoid, subcylindrical, straight or slightly curved, hyaline or yellowish to pale brown, smooth- and thin-walled, with or without septa, mostly 1 or 2–3-septate, eguttulate or guttulate. Sometimes chlamydospores occur in old cultures.
Type species: Ascochyta pisi Lib., Pl. crypt. Arduenna, fasc. (Liège) 1(nos 1-100): no. 59 (1830)
Notes: Ascochyta was introduced by Libert (1830) with A. pisi Lib. is the type species. The peculiar morphological characters are the globose locules with perithecial protuberances immersed in the stroma. Species are mostly endophytes, pathogens and saprobes and associated with a number of hosts worldwide (Wijayawardene et al. 2017, Farr & Rossman 2020). Ascochyta was accommodated in family Didymellaceae (Hyde et al. 2013, Kirk et al. 2013). The asexual morphs of Ascochyta are coelomycetes (Chen et al. 2015). Ariyawansa et al. (2015) introduced Heracleicola to Didymellaceae and Chen et al. (2017) synonymized the genus under Ascochyta. There are around 400 species epithets in the genus Ascochyta, however, the genus needs revision as more than 1000 records are available (Hyde et al. 2020).
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Last update: 02 May 2020