Tubeufiales » Tubeufiaceae » Neohelicomyces

Neohelicomyces thailandicus

Neohelicomyces thailandicus H. Zhang, W. Dong & K.D. Hyde

Index Fungorum number: IF557942; Facesoffungi number: FoF09287

Etymology: referring to Thailand, where the holotype was collected

Holotype: MFLU 11-1079

 

Saprobic on decaying, submerged wood in freshwater. Sexual morph: Undetermined. Asexual morph: Colonies superficial, effuse, gregarious, white. Mycelium mostly immersed in natural substratum, sparsely branched, hyaline to pale brown. Conidiophores 300–400 × 2.8–4.6 µm (x̄ = 345 × 3.6 µm, n = 5), macronematous, mononematous, sparsely branched, erect, slender, uneven in width, cylindrical, smooth-walled, brown to pale brown, septate, slightly constricted at septa, thin-walled. Conidiogenous cells 8–11 × 2–3.5 µm (x̄ = 9.7 × 2.8 µm, n = 10), holoblastic, mono- to polyblastic, discrete, determinate, arising in a whorl from pale brown, ampulliform-like or subcylindrical cells or directly from conidiophores near every septum, with each bearing 1–4 tiny conidiogenous loci, hyaline to pale brown, smooth-walled. Conidia solitary, dry, pleurogenous, helicoid, rounded at tip, 14–18 µm diam. and conidial filament 1.3–1.8 µm wide (x̄ = 15.5 × 1.6 µm, n = 10), 120–145 µm long, tightly coiled 3.75–4.25 times, indistinctly multi-septate, guttulate, hyaline, smooth-walled. (Description from Dong et al. 2020)

 

Culture characteristics: On PDA, colony circular, reaching 5 mm in 10 days at 25 °C, brown from above and below, surface rough, with dense mycelium, dry, edge entire.

 

Material examined: THAILAND, Chiang Rai Province, on submerged wood in a stream, 18 January 2010, H. Zhang, a47 (MFLU 11-1079, holotype), ex-type living culture MFLUCC 11-0005.

 

Notes: Neohelicomyces thailandicus clusters in Neohelicomyces with high bootstrap support. It can be distinguished from the other species by its conidiogenous cells arising from ampulliform-like or subcylindrical cells and conidiophores near the septa, with each bearing 1–4 tiny conidiogenous loci (Luo et al. 2017; Lu et al. 2018; Tibpromma et al. 2018; Crous et al. 2019).

 

Freshwater distribution: Thailand (Dong et al. 2020)

 

Fig 1 Neohelicomyces thailandicus (MFLU 11-1079, holotype). a Colonies on submerged wood. b Conidiophores with attached conidia. c–e Conidiogenous cells. f–h Conidia. i Germinated conidium. j, k Colony on PDA (up-front, down-reverse). Scale bars: b, i = 30 μm, c–e = 10 μm, f–h = 5 μm (Dong et al. 2020)

 

References

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. https://doi.org/10.1007/s13225-020-00463-5

Lu YZ, Liu JK (Jack), Hyde KD, Jeewon R, Kang JC, Fan C, Boonmee S, Bhat DJ, Luo ZL, Lin CG, Eungwanichayapant PD (2018) A taxonomic reassessment of Tubeufiales based on multi-locus phylogeny and morphology. Fungal Divers 92:131–344. https://doi.org/10.1007/s13225-018-0411-y

Luo ZL, Bhat DJ, Jeewon R, Boonmee S, Bao DF, Zhao YC, Chai HM, Su HY, Su XJ, Hyde KD (2017) Molecular phylogeny and morphological characterization of asexual fungi (Tubeufiaceae) from freshwater habitats in Yunnan, China. Cryptogam Mycol 38:27–53. https://doi.org/10.7872/crym/v38.iss1.2017.27

 

Recent Genus

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Neohelicomyces

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