Arthrographis multiformispora Xin Li, Y.F. Han & Z.Q. Liang, 2022

Li, Xin, Zhang, Zhi-Yuan, Chen, Wan-Hao, Liang, Jian-Dong, Huang, Jian-Zhong, Han, Yan- Feng & Liang, Zong-Qi, 2022, A new species of Arthrographis (Eremomycetaceae, Dothideomycetes), from the soil in Guizhou, China, Phytotaxa 538 (3), pp. 175-181 : 178-179

Arthrographis multiformispora Xin Li, Y.F. Han & Z.Q. Liang , sp. nov. ( Fig. 2 )

Mycobank No.: MB841967

Type: — CHINA. Guizhou Province, Guiyang City, the green ground of Qianlingshan Park (N 26°60′, E 106°69′), soil, September 2016, Zhi-Yuan Zhang, dried holotype HMAS 351881 , ex-holotype CGMCC 3.20770 , ibid., GZUIFR 21.927 .

Colonies slow-growing on PDA and MEA after 14 days of incubation at 25 °C; on PDA reaching up 23–25 mm in diameter; white, flat or raised, glabrous toward the periphery, reverse white to buff; On MEA, attaining a diameter of 22–24 mm; pale to white, umbonate at center and flat toward the periphery, powdery, reverse white. Vegetative hyphae septate, hyaline, smooth- and thin-walled, 0.5–2.0 μm diam. Conidiophores simple or branched, erect, up to 88.0 µm long, hyaline, smooth-walled. Conidiogenous hyphae simple or branched, erect, 0.5–3.0 µm wide, forming septa basipetally to form arthroconidia released by schizolythic secession. Arthroconidia unicellular, cylindrical with truncated or cuboid, straight or slightly curved, 0.5–3.0 × 1.5–5.5 µm, hyaline. Chlamydospores terminal, unicellular, globose or subglobose, 2.5–4.0 × 3.5–4.5 μm. Non- trichosporiella-like synasexual morph in culture. Sexual morph not observed.

Etymology: —Referring to the presence of multiple types of spores.

Additional specimens examined: — CHINA, Guizhou Province, Guiyang City, the Affiliated Hospital of Guizhou Medical University , N 26°59′, E 106°71′, from soil beside a road, September 2016, Zhi-Yuan Zhang GZUIFR 21.928, ibid., GZUIFR 21.929 .

Known distribution: —Guiyang City, Guizhou Province, China.

Notes: —Phylogenetically, our four strains (CGMCC 3.20770, GZUIFR 21.927, GZUIFR 21.928, and GZUIFR 21.929) clustered in a single clade with a high support value (BI pp = posterior probability 1, ML BS 99). Morphologically, member of the genus Arthrographis is generally recognized based on their slow growth rate, the presence of 1-celled, cylindrical arthroconidia released schizolytically from dendritic conidiophores ( Sigler & Carmichael 1976). A. multiformispora differs from A. curvata , A. grakistii , A. kalrae and A. arxii in that it has no the trichosporiella-like synasexual morph ( Giraldo et al. 2014; Hernández-Restrepo et al. 2020). A. multiformispora resembles A. chlamydospora in the presence of chlamydospores, but the conidiophores of the latter mostly repeatedly branched, while A. multiformispora is simple or branched ( Giraldo et al. 2014). In conclusion, morphological and molecular phylogenetic results indicated that these new isolates are a new species in the genus Arthrographis , described here as A. multiformispora .

Figures

FIGURE 2. Morphology of Arthrographis multiformispora sp. nov. a, b, c, d. Colony on PDA and MEA after 14 d at 25 °C (upper surface and lower surface); e. chlamydospores; g. curved conidia; f, h, i, j. arthroconidia and branched conidiophores. Bars: e–h = 10 μm.