Fungalpedia – Note 900, Neodiluviicola
Neodiluviicola. W. Dong & H. Zhang.
Citation when using this data: Dong W et al. 2021 (in prep.) – Fungalpedia, Ascomycota.
Index Fungorum, Facesoffungi, MycoBank, GenBank., Fig 1
Classification: Pseudoproboscisporaceae, Atractosporales, Diaporthomycetidae, Sordariomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on submerged bamboo or wood. Sexual morph: Ascomata scattered or solitary, semi-immersed to superficial, subglobose or ellipsoidal, black, with a lateral, short neck. Necks black, lying horizontally on the host substrate or curving upwards. Peridium thin, comprising several layers of dark brown to black, compressed cells of textura angularis. Paraphyses numerous, cylindrical, unbranched, hyaline, septate, tapering towards the apex. Asci 8-spored, unitunicate, clavate to subcylindrical, pedicellate, with a distinct, refractive, wedge-shaped, apical ring. Ascospores obliquely uni-seriate or partially biseriate or sometimes triserial, fusiform, straight or slightly curved, aseptate or occasionally 1-septate, hyaline, thin-walled, with bipolar filamentous appendages. Appendages initially coiled in the bipolar chambers of ascospores then unfurl from within the chambers after releasing. Asexual morph: Undetermined.
Notes – Diluviicola aquatica was introduced based on its morphological similarities with the type species D. capensis in having black ascomata with a short, lateral neck and the same unfurling mechanism of ascospore appendages (Hyde et al. 1998, Zhang et al. 2017). However, D. aquatica is phylogenetically distant from D. capensis and forms a basal branch to Cataractispora and Pseudoproboscispora. We notice that D. aquatica and D. capensis have different unfurling mechanisms of appendages. The appendages of D. aquatica initially coiled in the chambers of ascospores then unfurl from within the chambers after their release (Zhang et al. 2017In contrast, the appendages of D. capensis are coiled in the conical cap which detached from the tip of ascospores once released in water and unfurl from within the cap (Hyde et al. 1998, this study). In addition, D. aquatica has clavate asci, while D. capensis has cylindrical asci.
Pseudoproboscispora has a similar appendage unfurling mechanism that is initially coiled and then unfurls in water to form long threads (Wong et al. 1999a), but lacks bipolar chambers containing coiled appendages. Instead, its appendages are initially proboscis-like, which also differ from D. aquatica. Therefore, we establish a new genus Neodiluviicola to accommodate D. aquatica.
Type species: Neodiluviicola aquatica (W. Dong, Huang Zhang & K.D. Hyde) W. Dong & H. Zhang, in Dong, Hyde, Jeewon, Doilom, Yu, Wang, Liu, Hu, Nalumpang & Zhang, Mycosphere 12(1): 66 (2021)
Other accepted species: Species Fungorum – search Neodiluviicola.
Figure 1 – Neodiluviicola aquatica (MFLU 15-2701). a Ascoma on host substrate. b Paraphyses. c Unitunicate ascus. d Apical ring. e, f Ascospores (e ascospore in cotton blue reagent). Scale bars: b, c = 30 μm, d = 15 μm, e, f = 20 μm.
References
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