taxonID	type	description	language	source
03DB87BBFF966C78FF03FD2CFE25498E.taxon	etymology	Etymology: The specific epithet ‘ guizhouensis ’ refers to the locality “ Guizhou Province ”, from where the holotype was collected. Holotype: GZAAS 24 - 0074 Saprobic on decaying wood in a freshwater habitat. Sexual morph Undetermined. Asexual morph: Hyphomycetous. Colonies on natural substrate superficial, effuse, solitary, scattered or gregarious, golden brown, shining. Mycelium mostly immersed (partly superficial), composed of branched, septate, pale brown to brown hyphae. Conidiophores 105 – 158.5 × 3.5 – 5.5 μm (x ̅ = 129 × 4.5 μm, n = 20), macronematous, mononematous, solitary, unbranched, cylindrical, uneven in width, straight or flexuous, 4 – 7 - septate, pale brown to brown, paler towards the apex, smooth, thick-walled. Conidiogenous cells 17 – 40 × 3 – 4.5 μm (x ̅ = 30 × 3.7 μm, n = 20), holoblastic, mono- or polyblastic, integrated, terminal, determinate or sometimes with cylindrical, enteroblastic percurrent extension, subcylindrical to cylindrical, pale brown to brown, smooth-walled. Conidia 32.5 – 51.5 × 7 – 10.5 μm (x ̅ = 40.5 × 8.5 μm, n = 40), acrogenous, solitary, dry, 2 – 4 - euseptate, guttulate, smooth-walled, pale brown to orange brown, with the end cells paler, straight or sometimes slightly bent, navicular or obclavate to cylindro-clavate, obtusely conic or rounded at the apex, obconic at the base. Culture characteristics: Conidia germinating on PDA within 10 h and germ tubes arising from the terminal end of the conidium. Colonies reached 23 mm diam. after 32 days of incubation at 25 ℃, circular, with flat, grayish white to pale brown mycelium on the surface, reverse brown to black brown with entire margin. Material examined: China, Guizhou Province, Qiannan Buyei and Miao Autonomous Prefecture, Dushan County, Zilin Mountain National Forest Park, on submerged decaying wood in freshwater habitat, 6 November 2024, Dan Xiong, ZLS 8 (GZAAS 24 - 0074, holotype), ex-type living culture GZCC 24 - 0171; Ibid., ZJS 10 (GZAAS 24 - 0075, paratype), living culture GZCC 24 - 0172. Notes: The phylogenetic tree (Fig. 1) showed that the two isolates of Jennwenomyces guizhouensis (GZCC 24 - 0171 and GZCC 24 - 0172) form a highly supported clade, sister to J. navicularis (BCRC FU 30873). A comparison of LSU and ITS sequences between J. guizhouensis (GZCC 24 - 0171) and J. navicularis (BCRC FU 30873) reveals their nucleotide differences of 1 / 741 bp (0.1 %, without gap) and 16 / 494 bp (3.2 %, including two gaps), respectively, indicating that they are distinct species. Morphologically, Jennwenomyces guizhouensis can be distinguished from J. navicularis (Goh & Kuo 2020) by its larger conidiophores (105 – 158.5 × 3.5 – 5.5 μm vs. 70 – 86.5 × 3.5 – 4.5 μm wide), and broader conidia (7 – 10.5 μm vs. 5 – 9 μm) with fewer septa (2 – 4 vs. 4 – 6). Moreover, the conidiogenous cells of Jennwenomyces navicularis are annellate at the apex, which are absent in J. guizhouensis (Goh & Kuo 2020). Based on these morphological differences and the results of phylogenetic analyses, Jennwenomyces guizhouensis was introduced as a new species.	en	Xiong, Dan, Ou, Jing, Chen, Ya-Ya (2025): Jennwenomyces guizhouensis sp. nov. from a freshwater habitat in Guizhou, China. Phytotaxa 694 (1): 46-56, DOI: 10.11646/phytotaxa.694.1.3, URL: https://doi.org/10.11646/phytotaxa.694.1.3
