Roussoellopsis sp.

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 sp.

Saprobic on decaying bamboo culms. Conidiomata 1.4–3.4 × 0.5–1.5 mm, forming under black, dome-shape areas of on host surface; individual locules in section 150–250 µm high, 250–750 µm diam, depressed globose with a flattened base, immersed under a clypeus, single to grouped, with a central ostiole. Peridium 7.5–12.5 µm thick at sides, composed of small polygonal cells (6–10 × 1.5–3.5 µm), surrounded by wedge-shaped stromatic region (130–300 µm wide at sides) composed of rectangular cells (5–15 × 3.5–7.5 µm). Conidiogenous cells 10–20 × 4–6 µm, doliform to cylindrical. Conidia 25–31(–34) × 17–25.5(–27.5) µm (x = 29.0 × 21.3 µm, n = 60), subglobose to obovoid, black to dark brown, with an entire sheath of 1–2 µm thick.

Specimen examined. JAPAN, Hokkaido, Sapporo, near Maruyama-park , on twigs of Sasa kurilensis , 6 June 2004, K . Tanaka, KT 1710 ( HHUF 30026 , living culture NBRC 106246 ) .

Notes: The asexual state strongly suggests that it is a species of Roussoellopsis , and the molecular analyses also showed that this strain (NBRC 106246) clusterred into the Roussoella / Roussoellopsis section (FIG. 1). This fungus is characterized by its unique ovoid conidia , while other species in this genus have almost globose conidia , it appears to be new. Possibly it maybe a same species as Ro. japonica , but the asexual morph of the latter has not been yet observed, the molecular data for Ro. japonica is also not available.