Neodidymelliopsis

Neodidymelliopsis Qian Chen & L. Cai, in Chen, Jiang, Zhang, Cai & Crous, Stud. Mycol. 82: 207 (2015)

Citation when using this entry, Chen C. et al. in prep. – An updated monograph of Coelomycetes, Mycosphere

Index Fungorum, Facesoffungi number, MycoBank, GenBank           

Classification: Didymellaceae, Pleosporales, Dothideomycetes, Ascomycota, Fungi

Saprobic on the host plants or from soil. The sexual morph is characterised by pseudothecial ascomata which are immersed or erumpent, separate or confluent, subglobose to pyriform and ostiolate. Asci are 8-spored, cylindrical to clavate, bitunicate, and sessile or stipitate. The pseudoparaphyses is 0(–3)-septate and filamentous. Ascospores are hyaline, bi- to triseriate, 1(–3)-septate, constricted at the septum, subovoid to oblong, ellipsoidal and smooth-walled. The asexual morph is characterised by the pycnidial conidiomata, which are immersed to semi-immersed or erumpent, dark brown to black, scattered to gregarious, unilocular or multilocular, glabrous, globose to subglobose, and ostiolate. The ostiole is single, papillate or with elongate necks, located in the centre or on the side. The pycnidial wall is comprised of textura angularis, thick-walled and dark brown to hyaline cells. Conidiophores are reduced to conidiogenous cells. Conidiogenous cells are enteroblastic, phialidic, determinate, doliiform to ampulliform, hyaline and smooth-walled. Chlamydospores are brown, single or in chains, intercalary or terminal, globose to oval, and sometimes dictyochlamydospores, present or absent. Conidia are hyaline to pale brown or pale yellowish, 0–1-septate, smooth- and thin-walled, guttulate, variable in shape, ovoid to ellipsoidal, or cylindrical, and or allantoid (Chen et al. 2015, Li et al. 2020).

Type species: Neodidymelliopsis cannabis (G. Winter) Qian Chen & L. Cai, Stud. Mycol. 82: 207 (2015)

=Sphaerella cannabis G. Winter, Hedwigia 11: 145 (1872)

=Mycosphaerella cannabis (G. Winter) Magnus, in Dalla Torre & Sarnthein, Fl. Tirol, Vorarlberg, Leichtenstein, III, Pilze: 465 (1905)

=Didymella cannabis (G. Winter) Arx, in Müller & von Arx, Beitr. Kryptfl. Schweiz 11(no. 2): 365 (1962

Notes: Neodidymelliopsis was established by Chen et al. (2015) based on N. cannabis as the type species. They accommodated a few  species previously included in Phoma, Ascochyta and Didymellas to Neodidymelliopsis, and introduced three combinations. At the same time, Chen et al. (2015) also treated Didymella urticicola and its asexual morph Phoma urticicola as synonyms of N. cannabis. Li et al. (2020) considered N. longicolla and N. longicolla as synonyms of N. ranunculi based on both morphology (LSU, ITS, tub2 and rpb2 datasets) and phylogeny (form of conidiomata and conidia). Qian et al. (2023) reported N. cynanchi as a new species in Neodidymelliopsis, and treated N. urticae as a synonym of N. cannabis, however, this was not be recorded in both Mycobank and Species Fungorum (July 2024). Neodidymelliopsis species are found in a variety of hosts and locations. Most species of this genus are usually found on leaves or stems of dying or dead plants, some of them are plant pathogens of ornamental plants as well have been identified as leaf endophytes (Chen et al. 2015, 2017, Ahmadpour et al. 2017, Hyde et al. 2019, 2020, Keirnan et al. 2021). Currently, there are 15 species listed in Neodidymelliopsis in Species Fungorum (July 2024). There are more than 3000 sequence data available for Neodidymelliopsis in GenBank (July 2024). The updated taxonomic treatment of this genus is Didymellaceae, in Pleosporales (Dothideomycetes) (Wijayawardene et al. 2022).

For all accepted species: see Species Fungorum, and search Neodidymelliopsis.