Pleosporales » Dictyosporiaceae » Dictyocheirospora

Dictyocheirospora thailandica

Dictyocheirospora thailandica X.D. Yu, W. Dong & H. Zhang

 

Index Fungorum number: IF557908; Facesoffungi number: FoF09251

Etymology: referring to Thailand, where the holotype was collected

Holotype: MFLU 18-0999

 

Saprobic on decaying wood in streams. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Colonies punctiform, up to 200 μm diam., sporodochial, velvety, dark brown. Mycelium immersed, composed of pale brown, smooth, thin-walled septate, branched, 1–2 μm wide hyphae. Conidiophores 12–19.5 μm long, micronematous to semi-macronematous, pale brown, smooth, thin-walled. Conidiogenous cells holoblastic, integrated, terminal, determinate, pale brown. Conidia solitary, terminal, cheiroid, 58–67 × 15.5–26.5 μm (x̄ = 61.5 × 21 μm), pale brown, consisting of 6–7 rows of cells; rows digitate, arising from a basal cell, each arm consisting of 9–13 cells, distoseptate, constricted at septa, rows appressed when young, inwardly curved at the tip, palmately divergent when squashed, smooth-walled, guttulate. (Descriptions from Boonmee et a. 2016)

 

Culture characteristics: On PDA, colony circular, reaching 40 mm in 45 days at 25 °C, pale yellow to grey from above, dark brown from below, surface rough, with dense mycelium, dry, raised, edge undulate to filiform.

 

Material examined: THAILAND, Phayao Province, on submerged wood in a stream, 23 February 2018, X.D. Yu, Y21 (MFLU 18-0999, holotype), ex-type living culture MFLUCC 18-0987.

 

NotesDictyocheirospora thailandica clusters with D. taiwanense Tennakoon et al. with low bootstrap support (Dong et al. 2020). Morphologically, they are entirely different species. Dictyocheirospora thailandica has broadly clavate conidia which easily become divergent and digitate when in water, while D. taiwanense has narrowly cylindrical conidia comprising of tightly compacted arms (Hyde et al. 2019). In addition, D. thailandica has shorter and wider conidia (42–65 × 20–45 µm vs. (72–)74–84(–86) × 16–20(–24) µm) with a higher number of conidial rows (6–7 vs. 5) than D. taiwanense (Hyde et al. 2019). Unfortunately, D. taiwanense only has LSU and ITS sequence data in GenBank, which show two and three nucleotide differences between D. thailandica (MFLUCC 18-0987) and D. taiwanense (MFLUCC 17-2654), respectively. No other genes can be compared. Based on the very distinct morphology, we introduce D. thailandica as a new species in Dictyocheirospora. We believe that D. thailandica and D. taiwanense will be separated clearly in the phylogenetic tree with protein coding genes added in future. (Notes from Dong et al. 2020)

 

References

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