Roussoellopsis japonica
Roussoellopsis japonica (I. Hino & Katum.) I. Hino & Katum., J. Jap. Bot. 40: 86 (1965).
≡ Didymosphaeria japonica I. Hino & Katum., Bull. Faculty of Agriculture, Yamaguchi University 5: 229 (1954).
Index Fungorum number: IF 338654; Facesoffungi number: FoF 11718 Fig. 1
Description:
Saprobic on woody substrates. Sexual morph: Ascostromata 1.5–2.5 mm diam., 0.2–0.8 mm high, scattered to gregarious, superficial or semi-immersed to densely erumpent, carbonaceous, dark brown to black, globose to subglobose. Ostiole 140–143 µm slit-like, with a small to large, flat, crest-like apex, which is variable in shape and composed of pseudoparenchymatous cells. Locules 280–350 μm diam., 160–180 high, depressed globose with a flattened base, single to grouped, with a central ostiole. Peridium 45–55 µm thick at the sides, broad at the apex and thinner at the base, one-layered, composed of small, lightly pigmented, thin-walled cells of textura prismatica. Hamathecium 2–6 µm of aseptate, long, hyaline, anastomosing and branched, cellular pseudoparaphyses, embedded in gel matrix between and above the asci. Asci 184–250 × 23–35 µm (x̄ = 208.5 × 24.7 µm, n=10), 8-spored, bitunicate, fissitunicate, cylindrical to clavate, with furcate pedicel, rounded at the apex with minute ocular chamber. Ascospores 49–60 × 12–18 µm (x̄ = 55.1 × 15.6 µm, n = 10), uni-seriate or partially bi-seriate, broadly fusiform, two-celled with acute ends, uniseptate and slightly constricted at each septum, smooth-walled. Asexual morph: Unknown.
Material examined: Japan, Nagato Province, on dead culms of Phyllostachys bambusoides (Poaceae), 16 May 1954, K. Katumoto (TNS 229675, Type).
Fig. 1 Didymosphaeria japonica (TNS: F 229675, Type). a–d Herbarium material. e Section through ascostromata. f Peridium. g Cellular pseudo paraphyses. h–l Asci. m–q Ascospores. Scale bars: c = 2000 μm, d = 1000 μm, e = 200 μm, f = 10 μm, g, m–q = 20 μm, h–l = 50 μm.
Importance and distribution
Roussoellopsis comprises only one species known on Poaceae and reported only from Asia (Japan).
References
Liu JK, Phookamsak R, Dai DQ, Tanaka K et al. 2014 – Roussoellaceae, a new pleosporalean family to accommodate the genera Neoroussoella gen. nov., Roussoella and Roussoellopsis. Phytotaxa 181, 1–33.
Tanaka K, Hirayama K, Yonezawa H, Hatakeyama S et al. 2009 – Molecular taxonomy of bambusicolous fungi: Tetraplosphaeriaceae, a new pleosporalean family with Tetraploa-like anamorphs. Studies in Mycology 64, 175–209.
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