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.
Neodidymelliopsis negundinis (MFLU 16-1123). a Herbarium specimen. b–d Appearance of brown conidiomata on the host. e–h Vertical sections of conidiomata. i, j Section of peridium. k–n Conidiogenous cells and developing conidia. o Germinating conidium. p–r Conidia. s Cultures on PDA. Scale bars b–c = 500 µm, d–e = 200 µm, f–h = 100 µm, i–j, o = 20 µm, k–n, p–r = 5 µm, s = 20 mm (Originally published in Li et al. (2020) and republished with authority)
References
Ahmadpour SA, Mehrabi-Koushki M, Farokhinejad R. 2017 – Neodidymelliopsis farokhinejadii, a new fungal species from dead branches of trees in Iran. Sydowia. 69, 171–182.
Chen Q, Hou LW, Duan WJ, Crous PW et al. 2017 – Didymellaceae revisited. Studies in Mycology. 87, 105–159.
Chen Q, Jiang JR, Zhang GZ, Crous PW. 2015 – Resolving the Phoma enigma. Studies in Mycology 82, 137–217.
Hyde KD, Dong Y, Phookamsak R, Jeewon R et al. 2020 – Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity 100, 5–277.
Hyde KD, Tennakoon DS, Jeewon R, Bhat DJ et al. 2019 – Fungal diversity notes 1036–1150: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity 96, 1–242.
Keirnan EC, Tan YP, Laurence MH, Mertin AA et al. 2021 – Cryptic diversity found in Didymellaceae from Australian native legumes. MycoKeys 78, 1–20.
Qian Z, Zhang S, Manawasinghe IS, Sun D et al. 2023 – Taxonomic revision of Neodidymelliopsis with N. cynanchi sp. nov., associated with Cynanchum sibiricum leaf spot in Xinjiang, China. New Zealand Journal of Botany, 1–14.
Li WJ, McKenzie EH, Liu JK, Bhat DJ et al. 2020 – Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100, 279–801.
Wijayawardene NN, Hyde KD, Dai DQ, Sánchez-García ML et al. 2022 – Outline of Fungi and fungus-like taxa–2021. Mycosphere 13(1), 53–453.
Entry by Chao Chen1,2,3
Edited by Kevin D. Hyde1,3 & Ishara S. Manawasinghe1
1Innovative Institute for Plant Health, College of Agriculture and Biology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, Guangdong, P.R. China.
2Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand.
3Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, Thailand; School of Science, Mae Fah Luang University, Chiang Rai, Thailand.
Published online 2024-July 30.
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