Corticimorbus sinomyrti S.F. Chen, F.F. Liu & M.J. Wingf., in Chen, Wingfield, Li & Liu, Pl. Path. 65(8): 1263
(2015)

Illustration: See Chen et al. (2016).

Pathogenic forming cankers on bark of Rhodomyrtus tomentosa (Aiton) Hassk. (Myrtaceae). Sexual morph: Ascostromata 100–850 × 200–320 μm , gregarious or rarely solitary, superficial to slightly immersed, orange to umber, pulvinate, ascostromatic tissue textura globulosa, covering the tops of the perithecial bases. Ascomata 110–490 μm diam. (x̅ = 318 μm , n = 50), perithecia, valsoid, up to six per stroma, globose to subglobose, fuscous black, embedded beneath surface of bark at base of stromata. Perithecial necks 50–190 × 55–125 μm (x̅ = 114 × 84 μm , n = 50), black, emerging at the stromatic surface as black ostioles with orange to umber stromatic tissue of textura porrecta. Asci 30–40 × 6–9 μm (x̅ = 35 × 7.8 μm , n = 100), 8-spored, unitunicate, fusoid to oval, non-stipitate. Ascospores biseriate, hyaline, 1-septate with septum variously placed in the spore but usually central, slightly constricted at septum, fusoid to ellipsoidal, ends round to slightly tapered, 8–10 × 2–4 μm (x̅ = 8.8 × 3.1 μm , n = 100). Asexual morph: Conidiomata 150–1170 × 305–1525 μm (x̅ = 574 × 759 μm , n = 50), orange when young, fuscous black when mature, conical to globose, superficial, without necks, uni- to multilocular structures, with locules often convoluted, stromatic tissue textura globulosa. Locules 133–305 μm diam. (x̅ = 199 μm , n = 50). Conidiophores 9–20 μm long (x̅ = 12.8 μm , n = 50), non-septate, cylindrical, occasionally with separating septa and branching, hyaline. Conidiogenous cells 1–2 μm wide (x̅ = 1.4 μm , n = 50), cylindrical or flask-shaped with attenuated apices. Paraphyses absent. Conidia 3.5–4.8 × 1.3–2 μm , (x̅ = 3.8 × 1.5 μm , n = 100), hyaline, fusoid to oval, aseptate, exuded as orange droplets or tendrils (description based on Chen et al. 2016).

Notes: Monotypic genus Corticimorbus was introduced and typified by C. sinomyrti. Corticimorbus sinomyrti is a tree pathogen on the Myrtales tree species, especially forms stem canker disease on native Rhodomyrtus tomentosa (Chen et al. 2016).