Eriosporella Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 125(1-2): 109 (1916)
Ascomycota, genera incertae sedis
Saprobic on leaves of Calamus sp. (Arecaceae). Sexual morph: see (Nag Raj 1993). Asexual morph: Conidiomata straw-coloured, acervular, amphigenous but predominantly epiphyllous, solitary to gregarious, rounded to oval or square to irregular in outline, unilocular, thick-walled, glabrous. Conidiomatal wall composed of thin-walled, hyaline cells of textura angularis mixed with host cells. Conidiophores arising all around the cavity of the conidiomata, hyaline, septate, branched or unbranched, smooth-walled, invested in a thin layer of mucus. Conidiogenous cells hyaline, narrowly conical, ampulliform or lageniform, discrete or integrated, smooth-walled (Nag Raj 1993). Conidia hyaline, tetraradiate, main axis cylindrical to obconical, with a truncate base bearing minute marginal frills, aseptate or 1-septate, smooth-walled; 3-armed, with arms inserted at the apex of the main axis and separated from it by septa, divergent, broader at base and attenuated towards the apex, flexuous, unequal, septate, guttulate, smooth-walled; central arm 5–7-septate other arms 2–4-septate.
Notes: Eriosporella is characterized by acervular, immersed conidiomata and hyaline, tetraradiate conidia composed of a basal main axis bearing single appendage and three apical, flexuous, unequal, septate arms. Although Sutton (1980) and Van der Aa and Van Oorschot (1985) regarded the conidiogenous cells as phialides, Nag Raj and DiCosmo (1981) and Nag Raj (1993) described them as annellides with up to three annellations. We re-examined the type specimen but it is in poor condition and we could not confirm if it is phiallidic or annellidic Dai et al. (2014) described a second species E. bambusicola D.Q. Dai, et al. on the basis of its tetraradiate conidia. However, they did not pay much attention to other characters of the conidiomata and conidiogenous cells. This species is, in fact, a hyphomycetes with sporodochial fruiting bodies distinct from the acervular, immersed conidiomata in Eriosporella. In addition, E. bambusicola has sympodial, monoblastic, rarely polyblastic conidiogenous cells. Eriosporella bambusicola matches Tricornispora bambusae Bonar (type species of Tricornispora) (Van der AA and Van Oorschot 1985). The conidia of E. bambusicola are 4.5–8.5 × 2.5–5 µm (main axis) and 42.5–60 × 3–5 µm (arms), which is similar to T. bambusae 9–12 × 4–4.5 (main axis) and (15–)40–75 × 3–4.5 µm (arms). Therefore, Eriosporella bambusicola is regarded as a synonym of Tricornispora bambusae. Eriosporella therefore remains monotypic.
Distribution: Austria, India, Japan (Nag raj 1993, this study).
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.