Didymella macrostoma (Mont.) Qian Chen & L. Cai, in Chen, Jiang, Zhang, Cai & Crous, Stud. Mycol. 82: 177 (2015)
Saprophytic on dead stems of Vicia sp., forming conspicuous rounded, black conidiomata. Sexual morph: see Jayasiri et al. (2017). Asexual morph: Conidiomata 200–230 µm diam., 100–200 µm high, black, pycnidial, solitary to gregarious or occasionally confluent, immersed to semi-immersed, globose to subglobose, unilocular, glabrous, ostiolate. Ostiole circular, papillate, laterally or centrically located. Conidiomatal wall 10–20 µm wide, composed of thick-walled, dark brown to hyaline cells of texura angularis. Conidiophores formed from the innermost layer of wall cells, reduced to conidiogenous cells. Conidiogenous cells 2–6 × 3–6 µm, hyaline, enteroblastic, phialidic, ampuliform, smooth-walled, with a periclinal wall thickening at the tip. Conidia 4–9 × 3–4 µm ( = 6 × 3.3 µm; n = 50), hyaline, fusiform to oblong, or oval, or irregular in shape, straight or slightly curved, 0–1-septate, smooth-walled.
Material examined: Italy, Province of Arezzo, Quota, Casuccia di Micheli, on dead aerial stems of Vicia sp. (Fabaceae), 1 June 2015, Erio Camporesi, IT2514 (MFLU 15-1344), (KUN, HKAS93628).
Notes: The sequence of this collection (MFLU 15-1344) was obtained via direct sequence from fruiting bodies.
Didymella macrostoma (MFLU 15-1344) a Herbarium package and specimens. b, c Appearance of black coniodiomata on the host. d Surface view of conidioma. e, f Vertical section of conidiomata. g Section of peridium. h–j Conidiogenous cells and developing conidia k–s Conidia. Scale bars d–f = 100 µm, g = 10 µm, h–s = 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.