Sordariomycetes families incertae sedis » Acrodictyaceae » Acrodictys

Acrodictys fluminicola

Acrodictys fluminicola Z.L. Luo, K.D. Hyde & H.Y. Su

 

Index Fungorum number: IF 555657, Facesoffungi number: FoF 05429

Etymology: Referring to this fungus dwelling in a stream.

Holotype: DLU 0274

 

Saprobic on decaying wood submerged in freshwater habitats. Asexual morph: Colonies effuse, dark brown to black. Conidiophores 98–142 µm long, 4–6 µm wide ( = 120 ´ 5 µm, n = 20), macronematous, mononematous, erect, unbranched, straight or flexuous, septate, dark brown at the base, narrower and paler toward the apex, smooth, thick-walled. Conidiogenous cells monoblastic, integrated, terminal, cylindrical, lageniform to doliiform, subhyaline to pale brown, smooth. Conidia 24–30 µm long, 13–17 µm wide ( = 27 ´ 15 µm, n = 20), acrogenous, solitary, muriform, broadly clavate, obovoid to pyriform, usually with 2–3 transverse septa and a few longitudinal septa, with conspicuous pores in each cells, slightly constricted at the septa, pale brown at the basal cells and brown at the other part, basal cell obconical, truncate at base. Sexual morph: Undetermined.

 

Material examined: CHINA, Yunnan Province, Cangshan Mountain, saprobic on decaying wood submerged in a freshwater stream, October 2014, L.W. Wang, S-274 (DLU 0274, holotype), ex-type living culture KUMCC 15–0240.

 

Notes: Acrodictys fluminicola resembles the generic type A. bambusicola in having macronematous, unbranched and septate conidiophores dark brown at the base, narrower and paler toward the apex, solitary, muriform, obovoid to pyriform conidia slightly constricted at the septa, with obconical basal cell and the size of conidiophores and conidia of these two species are almost similar (Xia et al. 2017). However, A. fluminicola differs from A. bambusicola in has 2–3 transverse septa conidia with conspicuous guttulae in each cell, while A. bambusicola have 3–4 transverse septa. Phylogenetic analysis also shows that Acrodictys fluminicola and A. bambusicola are distinct species. Phylogenetically, A. aquatica clusters with A. hainnensis, however, Acrodictys fluminicola morphologically differs from A. hainnensis in having longer conidiophores (98–142 vs. up to 35 µm) and larger conidia (24–30 ´ 13–17 vs. 15–22 ´ 7–13 µm).

 

References

Luo ZL, Hyde KD, Liu JK, Maharachchikumbura SSN et al. 2019 – Freshwater Sordariomycetes. Fungal Diversity 99, 451–660.

Xia JW, Ma YR, Li Z, Zhang XG. 2017 – Acrodictys-like wood decay fungi from southern China,
with two new families Acrodictyaceae and Junewangiaceae. Scientific Reports 7, 7888.