Neodiluviicola
Neodiluviicola W. Dong & H. Zhang, in Dong, Hyde, Jeewon, Doilom, Yu, Wang, Liu, Hu, Nalumpang & Zhang, Mycosphere 12(1): 66 (2021)
Diaporthomycetidae, Diaporthomycetidae family incertae sedis, Pseudoproboscisporaceae, Neodiluviicola
Index Fungorum number: IF558080; Facesoffungi number: FoF 09565; 1 morphological species; 1 species with sequence data
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 triseriate, 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 (copied from Dong et al. 2021).
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)
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 (Fig. 1) in the study conducted by Dong et al. (2021). 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. 2017). In 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, Dong et al. 2021). 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. 1999), but lacks bipolar chambers containing coiled appendages. Instead, its appendages are initially proboscis-like, which also differ from D. aquatica. Therefore, the new genus Neodiluviicola is established to accommodate D. aquatica (copied from Dong et al. 2021).
Species illustrated in this entry:
Neodiluviicola aquatica (W. Dong, Huang Zhang & K.D. Hyde) W. Dong & H. Zhang
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