Tengiomyces Réblová, Mycotaxon 70: 408 (1999)
Hypocreomycetidae, Coronophorales genera incertae sedis
Index Fungorum number: IF 28271; 1 morphological species
Saprobic on wood. Sexual morph: Ascomata perithecial, superficial, solitary to gregarious, globose to subglobose, coriaceous, dark brown to black, surrounded by setae, seated on sparse, brown, septate, branched hyphae, ostiolate, with papilla. Setae brown to dark brown, spine-like, straight, acute, aseptate, opaque, unbranched. Peridium membranaceous, composed of brown to hyaline cells of textura angularis to textura prismatica. Paraphyses septate, evanescent. Asci 8-spored, unitunicate, cylindrical to clavate, broadly rounded to truncate and thickened at the apex, pedicellate. Ascospores ellipsoidal to clavate, with broadly rounded ends, straight to slightly curved, septate, middle cell(s) pale brown to brown, end cell(s) hyaline to subhyaline, slightly constricted at the septa, smooth-walled. Asexual morph (associated): Hyphomycetous, spadicoides-like. Mycelium semi-immersed to superficial. Conidiophores arising from superficial hyphae growing from the base of the perithecial initials and mature ascomata, macronematous, mononematous, unbranched or branched in the lower parts, cylindrical, pale brown, straight, flexuous in the lower parts, septate, not constricted or slightly constricted at the septa, apical cells rounded. Conidiogenous cells polytretic, integrated, intercalary and terminal. Conidia obpyriform to clavate, broadly rounded at the apex, septate, not constricted or slightly constricted at the septa, brown or the pigment fading from apex to bottom (copied from Huang et al. 2021).
Type species: Tengiomyces indicus (Varghese & V.G. Rao) Réblová, Mycotaxon 70: 408 (1999)
Notes: Réblová (1999) transferred Chaetosphaerella indica to Tengiomyces and established a monotypic genus. The black ascomata with setae on T. indicus are similar to Helminthosphaeria and Chaetosphaerella, and the ascospores comprise two brown middle cells and one hyaline cell at each end and are similar to Crassochaeta and Chaetosphaerella (Chaetosphaerellaceae, Coronophorales) (Réblová 1999; Huhndorf et al. 2004). A hyphomycetous spadicoides-like form was associated with T. indicus on the natural substrate (Réblová 1999). Spadicoides is polyphyletic in Pleosporales (Dothideomycetes) (Ma et al. 2016; Réblová et al. 2018). However, Huang et al. (2021) could not determine the relationship between Tengiomyces and Spadicoides without appropriate cultural characteristics and phylogenetic analysis. In the study by Huang et al. (2021), Tengiomyces with black, bristly ascomata and ellipsoidal ascospores comprise brown and hyaline cells is similar to Chaetosphaerella rather than Helminthosphaeria. Thus, Huang et al. (2021) placed Tengiomyces in Coronophorales genera incertae sedis pending further studies with molecular data (copied from Huang et al. 2021).
Species illustrated in this entry:
Tengiomyces indicus (Varghese & V.G. Rao) Réblová