Pleosporales » Didymellaceae » Didymella

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.