Fungalpedia – Note 881, Obliquiminima
Obliquiminima W. Dong, H. Zhang & K.D. Hyde
Citation when using this data: Dong W et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Cancellidiaceae, Cancellidiales, Hypocreomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Etymology – in reference to its neck growing oblique to the host substrate and small ascomata
Saprobic on submerged wood in freshwater. Sexual morph: Ascomata tiny, scattered, superficial, ellipsoidal to subglobose, black, coriaceous, ostiolate, with a lateral neck. Necks short, black, cylindrical, oblique to the host substrate. Peridium comprising several layers of dark brown to black, thick-walled, compressed cells of textura angularis. Paraphyses tapering towards the apex, dense, hypha-like, septate, unbranched, hyaline. Asci 8-spored, unitunicate, narrowly obclavate, slightly truncate at apex, sessile, with a small, refractive apical ring. Ascospores uni- to bi-seriate, oval, narrowly ellipsoidal, straight, aseptate, guttulate, hyaline, thin-walled, smooth, with a thin gelatinous sheath. Asexual morph: Undetermined.
Notes – Obliquiminima forms a sister clade with a hyphomycetous genus Cancellidium in Cancellidiaceae with high bootstrap support. Cancellidium is characterized by dictyosporous conidia arising from small conidiophores (Tubaki 1975). No sexual morphs are reported in Cancellidium, thus the morphology between Cancellidium and Obliquiminima cannot be compared. Our multigene analysis supports Obliquiminima to be a new genus in Cancellidiaceae.
Type species – Obliquiminima hyalina W. Dong, H. Zhang & K.D. Hyde.
Other accepted species: Species Fungorum – search Obliquiminima.
Figure 1 – Obliquiminima hyalina (MFLU 18-1521, holotype). a Ascomata on host substrate. b Vertical section of ascoma. c Structure of peridium. d–g Unitunicate asci. h, i Ascospores in water. j, k Ascospores in Indian Ink. l, m Apical rings. n Germinated ascospores. o, p Colony on PDA (left-front, right-reverse). Scale bars: b = 50 μm, c, e, f, h–k = 20 μm, d, g, n = 30 μm, l, m = 10 μm.
References
Tubaki K. 1975 – Notes on the Japanese Hyphomycetes. VII. Cancellidium, a new Hyphomycetes genus. Transactions of the Mycological Society of Japan 16, 357–360.
Entry by
Wei Dong, Faculty of Agriculture and Food, Kunming University of Science & Technology, Kunming 650500, China, Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Innovative Agriculture Research Center, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand, Center of Excellence for Fungal Research, Mae Fah Luang University, Chiang Rai 57100, Thailand, Innovative Institute for Plant Health, Zhongkai University of Agriculture and Engineering, Haizhu District, Guangzhou 510225, China
Published online 15 February 2021