Cancellidiales » Cancellidiaceae


Obliquiminima W. Dong, H. Zhang & K.D. Hyde, in Dong, Hyde, Jeewon, Doilom, Yu, Wang, Liu, Hu, Nalumpang & Zhang, Mycosphere 12(1): 25 (2021)

Diaporthomycetidae, Cancellidiales, Cancellidiaceae, Obliquiminima       


Index Fungorum number: IF 558035; Facesoffungi number: FoF 09557; 1 morphological species; 1 species with sequence data

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 (copied from Dong et al. 2021).


Type species: Obliquiminima hyalina W. Dong, H. Zhang & K.D. Hyde, in Dong, Hyde, Jeewon, Doilom, Yu, Wang, Liu, Hu, Nalumpang & Zhang, Mycosphere 12(1): 29 (2021)



Notes: Obliquiminima forms a sister clade with a hyphomycetous genus Cancellidium in Cancellidiaceae with high bootstrap support (Fig. 1) in Dong et al. (2021). 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. The multigene analysis by Dong et al. (2021) supports Obliquiminima to be a new genus in Cancellidiaceae (Fig. 1). Obliquiminima can be compared to an annulatascaceae-like genus Ayria in having ellipsoidal, aseptate, hyaline, finely guttulate ascospores (Fryar & Hyde 2004). However, Obliquiminima differs in having superficial ascomata, with a lateral neck that oblique to the host substrate, narrowly obclavate asci with a refractive apical ring. In contrast, Ayria has immersed ascomata that become superficial at maturity, clavate asci without an apical ring (Fryar & Hyde 2004). Ayria also has a neck, but which was not described in detail for two species, A. appendiculata and A. nubispora (Fryar & Hyde 2004, Raja et al. 2009). Ayria is placed in Annulatascaceae based on morphology, but it lacks molecular data (Hyde et al. 2020). Sequence data for Ayria are needed to infer the phylogenetic relationships between Ayria and Obliquiminima (copied from Dong et al. 2021).


Species illustrated in this entry:

Obliquiminima hyalina W. Dong, H. Zhang & K.D. Hyde


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