Parabambusicola aquatica W. Dong, H. Zhang & K.D. Hyde
Saprobic on submerged wood in freshwater. Sexual morph: Ascomata 150–180 μm high, 350–400 μm wide, scattered, immersed, with black spot on host surface, flatcone, brown, coriaceous. Peridium 10–25 μm thick at the sides, comprising several layers of brown, thin-walled, large cells of textura angularis, flattened and poorly developed at the base, 10–15 μm thick. Pseudoparaphyses 1.5–2 μm diam., numerous, cellular, hypha-like, hyaline, indistinctly septate, embedded in a gelatinous matrix. Asci 110–175 × 30–37 μm ( = 147 × 34 μm, n = 10), 8-spored, bitunicate, broadly clavate or narrowly ellipsoidal, apically rounded with well-developed ocular chamber. Ascospores 55–60(–67) × 12–17 μm ( = 56 × 14 μm, n = 10), overlapping bi- to tri-seriate, straight or slightly curved, hyaline, 5-septate, clearly shown when old, constricted at the septa, fusiform with rounded ends, with minute guttules thin-walled, smooth, with a globose mucilaginous sheath, 30–50 μm wide. Asexual morph: Undetermined. (Descriptions from Dong et al. 2020)
Material examined: THAILAND, Songkhla Province, on submerged wood in a stream, 10 May 2018, W. Dong, 20180503-1 (MFLU 18-1524, holotype), ex-type living culture MFLUCC 18-1140; ibid., 20180503-2 (HKAS 104993, isotype), ex-type living culture KUMCC 19-0010.
Notes: Parabambusicola aquatica is similar to P. bambusina and P. thysanolaenae in the characters of peridium, asci and ascospores (Tanaka and Harada 2003; Phookamsak et al. 2019). However, P. aquatica has wider asci (110–175 × 30–37 μm vs. 86–150 × 22–30 μm) and ascospores (55–60(–67) × 12–17 μm vs. 42–64.5 × 7–10 μm) than P. bambusina (Tanaka and Harada 2003). Parabambusicola aquatica also has larger ascospores than P. thysanolaenae (55–60(–67) × 12–17 μm vs. 45–55 μm × 7.5–11 μm). They are well separated in our phylogenetic tree. (Notes from Dong et al. 2020)
Freshwater distribution: Thailand (Dong et al. 2020)