Pleosporales » Massarinaceae

Helminthosporiella

Helminthosporiella Konta & K.D. Hyde, in Konta et al., Life 11(no. 454): 15 (2021).

   Index Fungorum number: IF 558311; Facesoffungi number: FoF 09171, 1 morphological species (Species Fungorum 2022), 1 species with molecular data.

            Saprobic on dead petiole of Cocos nucifera. Sexual morph: Unknown. Asexual morph: Colony on natural substrate black, hairy. Mycelium mostly immersed, at the surface forming small stroma-like aggregations of dark brown pseudoparenchymatous cells. Conidiophores macronematous, wide at the apex and base, arising singly from the stroma cells, erect, simple, unbranched, straight or flexuous, thick-walled, cylindrical, smooth-walled, dark brown, becoming pale brown at the apex, septate. Conidiogenous cells terminal and intercalary, polytretic, with well-defined thick, pale brown pores. Conidia obpyriform to lageniform, straight or curved, smooth-walled, subhyaline to light brown, distoseptate, with a thick scar at the base (adapted from Konta et al. 2021).

            Type species: Helminthosporiella stilbacea Konta & K.D. Hyde

Notes: Helminthosporiella was introduced by Crous et al. (2016) with H. stilbacea as type species but the genus was invalid since the basionym of the type species lacked a Latin diagnosis. Konta et al. (2021) validated Helminthosporiella as a distinct genus with a single species H. stilbacea and gave priority to the earlier genus and species names. Konta et al. (2021) provided the holotype of H. stilbacea collected from Cocos (Arecaceae) in Thailand. Helminthosporiella is morphologically a distinct and well-defined genus in Massarinaceae. Molecular markers available for Helminthosporiella include LSU, SSU, ITS, BTUB, Calmodulin and TEF-1.

 

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