Pleosporales » Dictyosporiaceae » Dictyosporium

Dictyocheirospora vinaya

Dictyocheirospora vinaya D’souza, Bhat & K.D. Hyde

 

Index Fungorum number: IF551582; Facesoffungi number: FoF 01263

Etymology: The term ‘vinaya’ meaning ‘separating’ in Sanskrit refers to the separating rows of the conidium.

Holotype: MFLU 14–0264

 

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: Conidia germinating on water agar within 24 h, germ tubes immerging from the basal cells of the conidium. Colonies on PDA covering 9 cm diam., in 4 weeks, at 28 °C, with wavy margins, at first white, later becoming orange. Sporulating regions scattered, but mostly confined to the centre of the culture.

 

Material examined: THAILAND. Chiang Mai, Mushroom Research Centre, on submerged wood in a freshwater stream, 24 November 2013, Zonglong Luo and Melvina D’souza, MJD-26 (MFLU 14–0264, holotype); ex-type living culture MFLUCC 14–0294.

 

Notes: Conidia of Dictyocheirospora vinaya are similar to D. heptaspora in size, but differ in having guttulate cells and simple, separable rows. Phylogenetic analysis place D. vinaya clustered with a node of species D. bannica and D. pseudomusae, but the species have very different conidia (Chen et al. 1991).

 

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

Chen JL, Hwang CH, Tzean SS (1991) Dictyosporium digitatum, a new hyphomycete from Taiwan. Mycol Res 95:1145–1149

 

Fig 1. Dictyocheirospora vinaya (holotype) a, b. Conidiomata on natural substrate, c–h. Mature conidia, i. Distoseptate cells, j. Germinating conidium, k, l. Colonies on water agar at 7 days. Scale bars: a, b = 200 μm, c–j = 30 μm. (Boonmee et al. 2016)

 

Fig 2. Sporulation of Dictyocheirospora vinaya in culture. a–c. Colonies on PDA at 30 days. d, e. Conidiomata in culture, f. Developing conidium, g. Close up of conidium cells, h–j. Conidia, k. Conidium arm scale bars: f–k = 25 μm

 

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