Pleosporales » Dictyosporiaceae » Dictyocheirospora

Dictyocheirospora rotunda

Dictyocheirospora rotunda M.J. D’souza, Bhat & K.D. Hyde

 

Index Fungorum number: 551581

 

Saprobic on submerged wood. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Conidiomata sporodochial, punctiform, velvety, black. Mycelium mostly immersed. Conidiophores micronematous, reduced. Conidiogenous cells holoblastic, monoblastic, integrated, terminal, determinate, pale brown, smooth-walled. Conidia 50–62 × 19–25 µm (x̄ = 56 × 22 µm, n = 15), solitary, acrogenous, cheiroid, pale brown to dark brown, consisting of 4–6 rows of cells, rows digitate, cylindrical to narrowly clavate, inwardly curved at the apex, with a subglobose, cuneiform basal cell, each arm composed of 10–12 cells, septate, constricted at septa. (Description from Dong et al. 2020)

 

Culture characteristics: On PDA, colony circular, reaching 50 mm in 25 days at 25 °C, grey to brown from above, black from below, surface rough, with dense mycelium, produced conidia in culture after 10 days, dry, raised, edge entire.

 

Material examined: CHINA, Yunnan Province, Kunming University of Science & Technology, on submerged wood in a stream, 10 May 2017, C.X. Liu, L13 (HKAS 102143), living culture KUMCC 19-0103; ibid., Qujing, on submerged wood in a stream, 10 May 2017, W. Dong, L40 (HKAS 102146), living culture KUMCC 19-0105.

 

Notes: Our two new collections KUMCC 19-0103 and KUMCC 19-0105 have slightly thinner conidia (50–62 × 19–25 µm vs. 42–58 × 19–38 μm) than the holotype in Thailand (Boonmee et al. 2016). Two collections cluster with D. rotunda with high bootstrap support (Dong et al. 2020).

 

Freshwater distribution: China (Wang et al. 2016; Dong et al. 2020), Thailand (Boonmee et al. 2016)

 

References

Boonmee, S., D’souza, M.J., Luo, Z. et al. Dictyosporiaceae fam. nov. Fungal Diversity 80, 457–482 (2016). https://doi.org/10.1007/s13225-016-0363-z

Dong W, Wang B, Hyde KD, McKenzie EHC, Raja HA, Tanaka K, Abdel-Wahab MA, Abdel-Aziz FA, Doilom M, Phookamsak R, Hongsanan S, Wanasinghe DN, Yu X-D, Wang G-N, Yang H, Yang J, Thambugala KM, Tian Q, Luo Z-L, Yang J-B, Miller AN, Fournier J, Boonmee S, Hu D-M, Nalumpang S, Zhang H (2020) Freshwater Dothideomycetes. Fungal Divers 105:319–575

Wang RX, Luo ZL, Hyde KD, Bhat DJ, Su XJ, Su HY (2016) New species and records of Dictyocheirospora from submerged wood in north-western Yunnan, China. Mycosphere 7:1357–1367

 

Fig 1. Dictyocheirospora rotunda a–g. HKAS 102146. h–k. HKAS 102143, a–c. Colonies on submerged wood, d–k. Conidia. Scale bars: d–k = 20 μm (Image from Dong et al. 2020)

 

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