Distoseptispora yunjushanensis Z. J. Zhai & D. M. Hu

Distoseptispora yunjushanensis Z. J. Zhai & D. M. Hu View in CoL , MycoKeys 88: 47 (2022)

Fig. 7 View Figure 7

Description.

Saprobic on dead branches in a terrestrial habitat. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies on natural substrate effuse, scattered, dark brown to black, hairy. Mycelium partly superficial, partly immersed in the substratum, composed of branched, septate, smooth, pale brown to brown hyphae. Conidiophores macronematous, mononematous, solitary or in groups, unbranched, erect, straight or slightly flexuous, cylindrical, smooth, 3–6 - septate, pale brown to brown, 125–243 × 7.5–10.5 µm (x ̄ = 185 × 9.9 µm, n = 14). Conidiogenous cells monoblastic, integrated, terminal, determinate or sometimes with one cylindrical percurrent extension, cylindrical, pale brown, smooth. Conidia acrogenous, solitary, dry, obclavate or ellipsoidal, 5–10 - distoseptate, smooth, brown, paler toward the apex, 67.5–96 × 16–22.5 µm (x ̄ = 83.2 × 19.4 µm, n = 30), tapering to 2.5–12.5 µm near the apex, 5–7.5 µm wide at the truncate base.

Culture characteristics.

Colonies on PDA reached 65–75 mm diam. after 4 weeks in an incubator under dark conditions at 25 ° C, circular, surface velvety, dark brown at the center, with dense, brown mycelium, black margin entire with flocculous mycelium, reverse black.

Material examined.

China • Jiangxi Province, Ganzhou City, Jiulianshan National Nature Reserve , 24°31'N, 114°27'E, on decaying wood of an unidentified broadleaf tree, 29 June 2022, Y. F. Hu ( HJAUP M 1307 , living culture HJAUP C 1307 ) GoogleMaps .

Notes.

Distoseptispora yunjushanensis , introduced by Zhai et al. (2022), was originally found on decaying bamboo culms submerged in a freshwater stream in China. Phylogenetic analysis shows that our new isolate ( HJAUP C 1307 ) clusters with D. yunjushanensis Z. J. Zhai & D. M. Hu ( JAUCC 4723 and JAUCC 4724) with 100 % ML / 1.00 BI support. Comparisons of nucleotide sequences for our new isolate ( HJAUP C 1307 ) and D. yunjushanensis ( JAUCC 4723) showed 7 (1.3 %, including three gaps) and 3 (0.5 %, including one gap) nucleotide differences in the ITS and LSU regions, respectively. Morphologically, our isolate fits well with the holotype description of D. yunjushanensis , except for its longer conidiophores (125–242.5 µm vs. 100–175 µm) and larger conidia [67.5–96 × 16–22.5 µm vs. 39–67.5 (– 77) × (7 –) 9.5–13.5 (– 16.5) μm] with fewer distosepta (4–10 vs. 7–13). In addition, our isolate was collected from a terrestrial habitat, as opposed to the freshwater habitat of the holotype of D. yunjushanensis . However, due to the high morphological similarity and only minor molecular differences, our new isolate does not meet the criteria for a new species, and is thus identified as D. yunjushanensis .