Dwayalomella Brisson, Piroz. & Pauzé, Can. J. Bot. 53(23): 2867 (1975)
Ascomycota, genera incertae sedis
Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata dark brown to black, stromatic, acervular or sporodochial, rounded to oval, containing numerous minute conidiomata in concentric zonations, mostly gregarious, sometimes solitary, multilocular, setose. Conidiomatal wall composed of thick-walled, pale brown cells of textura intricata to textura angularis at base, becoming thick-walled, brown cells of textura angularis to textura porrecta toward upper zone. Conidiomatal setae dark brown below, becoming brown above, marginal, subulate, erect, unbranched, 1-septate only at the base, smooth-walled, Conidiophores hyaline, cylindrical to subcylindrical, branched, septate, arising from the upper layer of cells of the basal stroma. Conidiogenous cells phialidic, hyaline, cylindrical to subcylindrical, straight or slightly curved, discrete or integrated, indeterminate, smooth-walled. Conidia hyaline, cylindrical, rounded at both ends, but with a protuberant base, 1-septate in the median part, sometimes unicellular, smooth-walled and occasionally slightly constricted at the septum, guttulate, bearing appendages at both ends; apical appendages 1–3, tubular. divergent, fliform, fexuous, arising from the apical or subapical zone of conidia, basal appendage, tubular, unbranched, fliform, fexuous.
Notes: Dwayalomella has hyaline, cylindrical conidia bearing two or three subpolar appendages at each end, and superfcially resembles those of Infundibulomyces cupulatus Plaingam et al. (type species of Infundibulomyces) (Clark and Lott 1989; Nag Raj 1993; Plaingam et al. 2003). However, they can be distinguished by form of conidiogenous cells and conidiomata. Dwayalomella species possess enteroblastic, phialidic conidiogenous cells and acervular conidiomata which appear to be sporodochial in culture, with conidiomatal setae, while Infundibulomyces has holoblastic conidiogenous cells and cupulate conidiomata lacking setae. Two species are accepted in Dwayalomella, viz. Dwayalomella setulosa Carrisand D. vaccinia, but no molecular sequence is available.
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.