Dictyochaeta Speg., Physis, Rev. Soc. Arg. Cienc. Nat. 7: 18 (1923)
Sordariomycetidae, Chaetosphaeriales, Chaetosphaeriaceae, Dictyochaeta
Index Fungorum number: IF 7996; 104 morphological species (Species Fungorum 2020); 13 species with sequence data.
Saprobic on plant substrates. Asexual morph: Colonies brown to dark brown, effuse. Mycelium usually immersed, made up of smooth, septate, pale to medium brown, branched hyphae. Setae erect, thick-walled, septate, dark brown, becoming paler brown towards the apex, smooth, fertile. Conidiophores macronematous, mononematous, simple, straight to flexuous, septate, pale brown to brown, smooth. Conidiogenous cells integrated, terminal, monophialidic, sympodial, comprising a clearly noticeable flared collarete, pale brown to subhyaline, subhyaline. Conidia grouped in colourless slimy masses, hyaline, acrogenous, generally solitary, acicular or clavate or ellipsoidal or cylindrical to fusiform, base rounded, septate or aseptate, smooth-walled, lacking setulae or comprising hair-like appendages at one or both ends. Sexual morph: Undetermined (adapted from Luo et al. 2019).
Type species: Dictyochaeta fuegiana Speg., Physis, Rev. Soc. Arg. Cienc. Nat. 7: 18 (1923)
Notes: Dictyochaeta was erected by Spegazzini (1923) based on Dictyochaeta fuegiana. Species of this genus are saprobes on decaying plant parts (Whitton et al. 2000, Réblová & Winka 2000, Kuthubutheen & Nawawi 1991). Dictyochaeta is characterised by macronematous, mononematous, pale brown to dark brown conidiophores, mono- or polyphialidic, sympodially proliferating conidiogenous cells with flared collarettes and hyaline, clavate conidia without setulae (Réblová & Winka 2000) (notes from Hyde et al. 2020).
Species illustrated in this entry:
Dictyochaeta cangshanensis Z.L. Luo, K.D. Hyde & H.Y. Su