Chaetophiophoma sorbi W.J. Li, Camporesi & K.D. Hyde, sp. nov.
Etymology: Named after the host genus, Sorbus
Saprobic on dead stems of Sorbus aucuparia (Rosaceae), forming numerous, conspicuous rounded, black, conidiomata. Sexual morph: undetermined. Asexual morph: Conidiomata 200–250 µm diam., 250–300 µm high, black, scattered to gregarious or confluent, pycnidial, immersed to semi-immersed, subglobose, unilocular, glabrous, thick-walled, smooth, papillate. Conidiomata wall 20–1000 µm thick, composed of thick-walled, hyaline to pale brown cells of textura angularis. Conidiophores arising from the inner layers of pycnidium, hyaline, repeatedly branched at the base and above, often fasciculate, septate in association with branches, with acropleurogenous conidia. Conidiogenous cells 8–30 × 1.5–3 µm, hyaline, enteroblastic, phialidic, cylindrical, indeterminate, integrated or discrete, thin-walled, smooth, with collarette and narrow channel. Conidia 13–17 × 2–4 µm (x= 15 × 3 µm; n = 30), hyaline, fusiform to falcate, aseptate, thick-walled, smooth, guttulate.
Material examined: Italy, Forlì-Cesena, near Monte Falco, on dead aerial branches of Sorbus aucuparia (Rosaceae), 8 July 2015, Camporesi Erio, IT2554 (MFLU 15-2273, holotype), (KUN, HKAS 93633, isotype).
Chaetophiophoma sorbi (MFLU 15-2273, holotype) a Herbarium specimen. b, c Appearance of black conidiomata on the host. d Vertical section of conidioma. e, f Section of peridium. g–j Conidiophores, conidiogenous cells and developing conidia k–o Conidia. Scale bars d = 100 µm, e = 50 µm, f = 20 µm. g–j = 10 µm. k–o =5 µm.
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.