Pleosporales » Didymellaceae

Ectodidymella

Ectodidymella L.W. Hou, L. Cai & Crous, in Hou et al., Stud. Mycol. 96: 340 (2020).

Index Fungorum number: IF 833506; Facesoffungi number: FoF 11506, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

Pathogenic on host. Sexual morph: Ascomata pseudothecial, only recorded in one species in vivo, erumpent, globose to irregular-shaped, solitary or confluent, scattered or aggregated, ostiolate, with a small papilla-shaped ostioles, lacking setae. Pseudothecial wall rough, multi-layered, composed of pseudoparenchymatous cells, outer layers pigmented, black-brown. Asci narrow, cylindrical to clavate, 4–8-spored, coarse and thick-walled. Pseudoparaphyses scanty and atypical, coarse, branched. Ascospores hyaline, biseriate, elongated clavate to fusiform, uniseptate, slightly or barely constricted at the septum, upper cell slightly wider than the lower cell. Asexual morph: Conidiomata pycnidial, scattered, globose, depressed globose, black, large, usually with a conspicuous neck. Pycnidial wall thick, pseudoparenchymatous, outer layers slightly pigmented. Conidiogenous cells phialidic, hyaline, smooth, ampulliform to doliiform, with minute periclinal thickening. Conidia oblong to subcylindrical, eguttulate or with a small guttule at each end (adapted from Hou et al. 2020).

 Type species: Ectodidymella nigrificans (P. Karst.) L.W. Hou, L. Cai & Crous

Notes: Ectodidymella is characterised by pycnidial, scattered, globose conidiomata, phialidic, hyaline, smooth, ampulliform to doliiform conidiogenous cells, and subcylindrical, eguttulate conidia. The sexual morph is characterised by globose to irregular-shaped, solitary ascomata, rough, multi-layered pseudothecial wall, cylindrical to clavate asci and hyaline, biseriate, elongated clavate to fusiform ascospores. In the phylogenetic analysis of Hou et al. (2020) based on LSU, ITS, RPB2 and BTUB sequences, Ectodidymella formed a distinct lineage in Didymellaceae with high statistical support. Ectodidymella differs from Didymella in producing four ascospores in one ascus, which does not occur in Didymella. Ectodidymella is a distinct and well-defined genus in Didymellaceae. Molecular markers available for Ectodidymella are Actin, BTUB and RPB2.

 

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