Pleosporales » Roussoellaceae » Neoroussoella

Neoroussoella bambusae

Neoroussoella bambusae Phook., Jian K. Liu & K.D. Hyde

Index Fungorum number: IF550669; Facesoffungi number: FoF02414

Holotype: MFLU 11−0160

Etymology: Named for the host from where the fungus was isolated.

 

Saprobic on submerged wood. Sexual morph: Ascostromata 300–330 μm high, 370–400 diam., immersed under an epidermis, erumpent to semi-immersed, scattered to gregarious, raised, visible as black dome-shaped or shield-shaped on the host surface, coriaceous, black, central ostiolate, with elongate, distinct papilla. Peridium composed of several layers of textura angularis, thick-walled and dark brown to black in outer layer, thin-walled and hyaline inwardly, flattened and thicker at the base, 50 μm wide, thinner at sides, 30 μm wide. Pseudoparaphyses 1.5–2 μm wide, numerous, anastomosing cellular, embedded in a gelatinous matrix. Asci (105–)113–115 × 6–8 μm (x̄ = 114 × 7 μm, n = 10), 8-spored, bitunicate, cylindrical, short to long pedicellate, apically rounded with an ocular chamber. Ascospores 11–14.5 × 4–5.5 μm (x̄ = 12.5 × 5 μm, n = 15), uniseriate to overlapping uniseriate, ellipsoidal to broadly fusiform, 1-septate, constricted at the septum, pale brown to brown or yellowish brown, guttulate, rough-walled, longitudinally ribbed. Asexual morph: Undetermined. (Description from Dong et al. 2020)

 

Material examined: CHINA, Yunnan Province, Dehong, on submerged wood in a stream, 25 November 2017, G.N. Wang, HH1A-1 (MFLU 18-1187), living culture MFLUCC 18-1048; ibid., HH1A-2 (HKAS 101750), living culture KUMCC 18-0102.

 

Notes: Our collection MFLUCC 18-1048 clusters with Neoroussoella bambusae with high bootstrap support. MFLUCC 18-1048 is identified as N. bambusae based on sequence data which has three, seven (includes three gaps) and three (includes one gap) nucleotide differences in LSU, ITS and TEF sequence data, respectively, with the ex-type strain MFLUCC 11-0124. Our collection has longer asci (105–115 × 6–8 μm vs. 60–85 × 5–6.5 μm) and ascospores (11–14.5 × 4–5.5 μm vs. 7.5–10 × 3–4 μm) than the holotype (Liu et al. 2014). The elongate, distinct papilla is observed in our collection, but lacking in the holotype (Liu et al. 2014). This is a new habitat and geographical record for N. bambusae from freshwater in China. (Notes from Dong et al. 2020)

 

Freshwater distribution: China (Dong et al. 2020)

 

Fig. 1 Neoroussoella bambusae (MFLU 18-1187, new habitat and geographical record). a, b Ascostromata on host substrate. c Vertical section of ascoma. d Structure of peridium. e Pseudoparaphyses. f–i Bitunicate asci. j–l Ascospores. m, n Colony on PDA (left-front, right-reverse). Scale bars: c = 100 μm, d–i = 20 μm, j–l = 5 μm. (Dong et al. 2020)

 

References

Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575

Liu JK, Phookamsak R, Dai D, Tanaka K, Jones EBG, Xu JC, Chukeatirote E, Hyde KD (2014) Roussoellaceae, a new pleosporalean family to accommodate the genera Neoroussoella gen. nov. Roussoella and Roussoellopsis. Phytotaxa 181:1–33

 

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