Tubeufiales » Tubeufiaceae

Helicodochium

Helicodochium J.S. Monteiro, R.F. Castañeda, A.C. Cruz & Gusmão

Index Fungorum number: IF 804995

 

Saprobic on submerged decaying woody substrates. Sexual morph: Undetermined. Asexual morph: Hyphomycetous, helicosporous. Colonies on the natural substrate effuse, pinkish to pink. Mycelium partly immersed, partly superficial. Conidiomata sporodochial, apothecium-like, dry, scattered, pinkish to pink, consisting of numerous conidiophores arising from a stroma of globose, thick-walled, pale brown cells. Conidiophores macronematous, erect, branched or unbranched, septate, arising from a thick-walled, pseudoparenchymatous stromata with globose texture, pale brown, smooth-walled. Conidiogenous cells monoblastic, integrated, terminal, pale brown to hyaline, smooth-walled. Conidia solitary, acrogenous, helicoid, rounded at ends, multi-septate, forming a compact, incurved cluster towards the centre of the conidiomata, hyaline to pink, smooth-walled. (Lu et al. 2018)

 

Type species: Helicodochium amazonicum J.S. Monteiro, R.F. Castañeda, A.C. Cruz & Gusmão, Mycotaxon 127: 6 (2014)

 

Notes: Helicodochium was introduced by Monteiro et al. (2014) and characterized by sporodochial, apothecium-like, pinkish to pink conidiomata with macronematous conidiophores arising from a thick-walled, pseudoparenchymatous stromata, and hyaline to pink conidia (Monteiro et al. 2014; Lu et al. 2018). Lu et al. (2018) transferred Helicodochium from Ascomycota genera incertae sedis to Tubeufiaceae based on morphology and phylogeny, together with a new species H. aquaticum Y.Z. Lu et al. The type species H. amazonicum lacks sequence data in GenBank. (Notes from Dong et al. 2020)

 

List of freshwater Helicodochium species

Helicodochium amazonicum J.S. Monteiro, R.F. Castañeda, A.C. Cruz & Gusmão, Mycotaxon 127: 6 (2014)

Freshwater distribution: Brazil (Monteiro et al. 2014)

 

Helicodochium aquaticum Y.Z. Lu, Boonmee & K.D. Hyde, Fungal Diversity 92: 168 (2018)

Freshwater distribution: Thailand (Lu et al. 2018b)

 

Key to freshwater Helicodochium species

1. Conidia 70–82.5 μm diam....................................................... H. amazonicum

1. Conidia 42–60 μm diam............................................................. H. aquaticum

 

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

Monteiro JS, Gusmão LFP, Castañeda-Ruiz RF (2014) Helicodochium, a new microfungus from submerged wood in Brazil. Mycotaxon 127:5–9. https://doi.org/10.5248/127.5

 

Recent Genus

1
Neochlamydotubeufia
Neohelicomyces

Recent Species

Neohelicomyces submersus
Neohelicomyces hyalosporus
Neohelicomyces grandisporus