Didymella macrostoma
Didymella macrostoma (Mont.) Qian Chen & L. Cai, in Chen et al., Stud. Mycol. 82: 177 (2015)
Index Fungorum number: 814108; Facesofungi number: FoF 02502
≡ Phoma macrostoma Mont., Annls Sci. Nat., Bot., sér. 3 11: 52 (1849)
Saprobic on dead aerial stem of Origanum vulgare. Sexual morph: Undetermined. Asexual morph: Coelomycetous. Conidiomata 120–160 μm diam., black initially immersed, becoming erumpent through the host epidermis. Pycnidial walls composed of dark 3– 4 layers, thick-walled cells of textura angularis, outer 1–2 layers dark brown to black, inner 1–2 layers hyaline. Conidiophores reduced to conidiogenous cells. Conidiogenous cells 4–10 μm long × 3–8 μm wide, hyaline, phialidic, ampulliform to cylindrical, smooth. Conidia 5–8 × 3.5–5 μm wide, aseptate, ellipsoidal, with several small, scattered guttules.
Material examined: ITALY, Province of Forlì-Cesena [FC], San Savino di Predappio, on dead aerial stem of Origanum vulgare L. (Lamiaceae), 22 April 2018, E. Camporesi, IT 3845 (JZB380045).
Known host and distribution: Acer pseudoplatanus (Switzerland), Ailanthus altissima (Italy), Larix decidua (Germany), Malus sylvestris (Netherlands) (Farr and Rossman 2020)
GenBank Numbers: ITS: MN944409; LSU: MT020376
Note: The isolate obtained from dead aerial stem of Origanum vulgare was identifed as Didymella macrostoma with support from both morphology and phylogeny. This is the frst record of Didymella macrostoma from Origanum vulgare in Italy.
Figure x. Didymella macrostoma (JZB380045). a Appearance of conidiomata on the host. b Section through the conidiomata. c Pycnidial wall and immature conidia attached to conidiogenous cell. d-e Mature conidia. Scale bars: a = 100 μm, d, e = 10 μm.
References:
Farr DF, Rossman AY 2020 – Fungal Databases, Systematic Mycology and Microbiology Laboratory, ARS, USDA. http://nt.ars-grin.gov/fungaldatabases/
Hyde KD, Dong Y, Phookamsak R, Jeewon R et al. 2020 – Fungal diversity notes 1151–1276: taxonomic and phylogenetic contributions on genera and species of fungal taxa. Fungal Diversity 16, 1–273.