Roussoellopsis japonica (I. Hino & Katum.) I. Hino & Katum., J. Jap. Bot.

Liu, Jian-Kui, Phookamsak, Rungtiwa, Dai, Dong-Qin, Tanaka, Kazuaki, Jones, Gareth, Xu, Jian-Chu, Chukeatirote, Ekachai & Hyde, Kevin D., 2014, Roussoellaceae, a new pleosporalean family to accommodate the genera Neoroussoella gen. nov., Roussoella and Roussoellopsis, Phytotaxa 181 (1), pp. 1-33 : 25

Roussoellopsis japonica (I. Hino & Katum.) I. Hino & Katum., J. Jap. Bot. 40: 86. 1965. FIG. 15

≡ Didymosphaeria japonica I. Hino & Katum., Bull. Faculty of Agriculture, Yamaguchi University 5: 229. 1954.

Saprobic on decaying bamboo culms. Ascostromata 0.4–0.5 mm high, 1.2–2 mm diam, immersed under a clypeus or epidermis, visible as black raised, dome-shaped on host surface, solitary to gregarious, centrally ostiolate, multiloculate, containing 4–6 locules, cells of ascostromata brown-walled textura angularis. Locules 300–400 × 400–450 μm. Peridium up to 8.5–16.5 μm wide, composed of 2–3 layers of cells of textura angularis, light brown to brown thinwalled with flattened at the base. Hamathecium, comprising 1–1.5 μm wide, numerous, anastomosing, hyaphae-like, cellular pseudoparaphyses, smooth-walled, branching at the apex, often constricted at the septum, and embedded in a gelatinous matrix. Asci (130–)155–220× 22–27(–30) μm (x = 183 × 26 μm, n = 20), 8−spored, bitunicate, fissitunicate, clavate, short to long pedicellate, apically rounded with an ocular chamber. Ascospores (43–)48–55 × 8–12(–13.5) μm (x = 51 × 10.5 μm, n = 30), biseriate, fusiform, 2-celled, constricted at the septum, thick-walled, hyaline when immature, pale brown to brown or yellowish brown when mature. Asexual morphs not established.

Specimen examined JAPAN, Nagato Province , on dead culms of Phyllostachys bambusoides , 16 May 1954, K . Katumoto (holotype in YAM) .

Notes: We examined the type material of Roussoellopsis japonica , it matches well with the original description and we here give a detailed description.