Pseudoxylomyces aquaticus W. Dong, H. Zhang & K. D. Hyde 2020

Pseudoxylomyces aquaticus W. Dong, H. Zhang & K. D. Hyde (2020) Fig. 5 Description. Sexual morph undetermined. Asexual morph Conidia produced on carnation leaves and on the surface or submerged in WA. Conidiophores short (7–13.5 µm) or absent. Conidiogenous cells holoblastic. Conidia solitary, orange-brown when immature, turn brown in mature, occasionally with paler end cells in pale brown, broadly fusiform, most 5 thick and obvious septa (few 3–4 septa), rough, thick-walled, 37.6–50 µm × 11.8–17 µm (x ̄ = 44 × 14.5 µm, L / W ratio = 3.05, n = 20). Culture characteristics. Colony reaching 30 mm diam with dark grayish-brown in the center, pale brown to gray in margin, velvety, rough surface, entire edge, and similar to reverse side of the colony. Material examined. TAIWAN • Wanrung Township, Hualien County, 23°42'40.3"N, 121°24'48.2"E, serpentine soil in rice field, 2 nd November 2022, K. W. Cheng, living culture NTUPPMCC 22-223. Notes. Pseudoxylomyces aquaticus was previously documented on submerged wood in Thailand. Our study recovered a single strain (NTUPPMCC 22-223) that clustered in a strongly supported clade (100 % / 1.00) with the ex-type strain (KUMCC 17-0312) established by Dong et al. (2020), confirming its identity as Ps. aquaticus (Fig. 6). In this study, we observed the immature conidia with 3 to 4 septa showing more orange-brown in color (Fig. 5 C, D), a feature not described in previous study (Dong et al. 2020). In addition, this is the first discovery of the Pseudoxylomyces species in Taiwan.