Referring to the collecting location, Bangkok, Thailand.

MFLU 21-0110

Saprobic on submerged wood in freshwater stream. Sexual morph: Undetermined. Asexual morph: Colonies effuse, glistening, hairy, brown to dark brown. Mycelium partly superficial in the substratum, composed of hyaline to pale brown, septate, branched hyphae. Conidiophores 37–55 × 3–4 μm (x¯ = 46 × 3 μm, n = 15) macronematous, mononematous, solitary or in a small group of 2–4, cylindrical, straight or slightly flexuous, 3–8-septate, dark brown, paler at the apical part, rounded at the apex. Conidiogenous cells 6–8 × 3–4 μm (x¯ = 7 × 3 μm, n = 15), integrated, terminal, monoblastic, cylindrical, brown. Conidia 400–568 × 13–16 μm (x¯ = 484 × 15 μm, n = 20), 6–7 μm at the narrowest apical region, acrogenous, solitary, elongate, obclavate, rostrate, multi-distoseptate, tapering towards the apex, truncate at the base, rounded at apex, dark olivaceous to dark brown, straight or slightly curved, guttulate, thick-walled, smooth, conidia percurrent proliferation which forms another conidium at the apex.

Culture characteristics. Conidia cultivated on PDA within 12h and germ tubes produced at the ends. Colonies on PDA, reaching 6 cm in 1 month at room temperature (25 °C). Mycelium loose, flocculent, smooth edge, brown to dark brown, dark brown on the reverse.

Thailand, Bangkok Province, Khwaeng Phra Khanong Nuea, 13°42'41"N; 100°36'03"E, on submerged decaying wood, 1 October 2017, Zonglong Luo, S–3083 (MFLU 21-0110, holotype), ex-type living culture (MFLUCC 18-0262).

Distoseptisporabangkokensis is comparable to D.cangshanensis and D.multiseptata in having elongate, obclavate, or rostrate conidia (Su et al. 2016; Hyde et al. 2016a; Yang et al. 2018). However, D.bangkokensis has shorter and narrower conidiophores than those of D.cangshanensis (37–55 × 3–4 μm vs. 44–68 × 4–8 μm), but has longer conidia (400–568 μm vs. 58–166 μm); D.multiseptata (MFLU 17-0856) is similar to D.bangkokensis in conidial morphology, with conidia mostly 300–600 μm long (up to 700 μm) and significantly longer than those of the holotype (up to 380 μm long). However, Yang et al. (2018) did not give a detailed description of D.multiseptata (MFLU 17-0856). Phylogenetic analyses showed that D.bangkokensis clustered with D.bambusae, D.dehongensis, D.euseptata, D.lancangjiangensis, D.suoluoensis, D.thysanolaenae, and D.yunnanensis with low bootstrap support (26%ML/0.53PP, Figure 1). Distoseptisporabangkokensis is distoseptate conidia, and it is easily distinguished from D.bambusae, D.euseptata, D.lancangjiangensis, D.suoluoensis, and D.yunnanensis, which are euseptate. Distoseptisporabangkokensis is resemble to D.dehongensis and D.thysanolaenae in having obclavate, distoseptae conidia, but are distinguished by conidia characteristics, D.bangkokensis has elongate, obclavate, rostrate, multi-distoseptat, and longer conidia than D.dehongensis (400–568 × 13–16 μm vs. 17–30 × 7.5–10 μm) and D.thysanolaenae (400–568 × 13–16 μm vs. 30–70 × 5–8 μm), respectively.