Roussoellopsis tosaensis (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 : 28

Roussoellopsis tosaensis (I. Hino & Katum.) I. Hino & Katum., J. Jap. Bot. 40(3): 87. 1965. FIG. 17

Saprobic on decaying bamboo culms. Ascostromata 0.3–0.8 mm wide, 1.4–2.5 mm long., immersed under a clypeus, raised, visible as black, dome-shape areas on host surface. Locules 220–260 µm high, 560–630 µm diam, depressed globose with a flattened base, single to grouped, with a central ostiole. Beak short papillate, 60–90 µm high, 60–100 µm wide. Peridium 12.5–25 µm thick at sides, composed of small compressed cells, surrounded by wedge-shaped stromatic region. Hamathecium comprising 1–2 µm wide, numerous, anastomosing, cellular pseudoparaphyses, branching at the apex, rough-walled, and embedded in a gelatinous matrix. Asci 154–190 × 21.5–26 µm, 8-spored, bitunicate, clavate, short-stalked (23–40 µm long). Ascospores (33–)36–43(–53) × 12–17 µm (x = 40.3 × 14.6 µm, n = 23), biseriate, broadly fusiform with acute ends, 2-celled, with a submedian septum, brown, with irregular longitudinal striations. Asexual morphs produced in culture, a “ Melanconiopsis ” or “Neomelanconium”-like conidial state is formed. Conidiomata (individual locules) 200–500 µm high, 550–950 µm diam, depressed globose, single or grouped, immersed to erumpent, papillate at the apex. Peridium 15–30 µm thick at sides, composed of compressed dark brown cells. Conidiophores septate, unbranched. Conidiogenous cells 10–20 × 4–8 µm, doliform to cylindrical, annellidic. Conidia 20.5–30 µm diam (x = 23.5 µm, n = 50), globose to subglobose, slightly truncate at the base, black to dark brown, thick-walled, verrucose, with irregular gelatinous sheath (1 µm thick).

Specimen examined. JAPAN, Tokyo, Isl. Ooshima, Motomachi , on twigs of bamboo, 19 Mar 2004, K . Oota, KT 1659 ( HHUF 29234 , living culture JCM 13128 = MAFF 239638 ) .

Notes: The above material matches the original description of Didymosphaeria tosaensis (Hino & Katumoto 1955) .