Pleosporales » Massarinaceae » Helminthosporiella

Helminthosporiella stilbacea

Helminthosporiella stilbacea

Konta & K.D. Hyde (2021)

 

Classification:Ascomycota-Pezizomycotina-Dothideomycetes-Pleosporomycetidae-Pleosporales-Massarinaceae-Helminthosporiella

 

Host species: Cocos nucifera (Konta et al. 2021)

 

Holotype: MFLU 20-0521 (Konta et al. 2021)

 

Known distribution: Prachuap Khiri Khan, Thailand

 

IF Number: IF558312     Mycobank Number: 558312     FOF Number: FoF09172

 

Description

Saprobic on dead petiole of Cocos nucifera. Sexual morph: Undetermined. Asexual morph: Colony on natural substrate black, hairy. Mycelium mostly immersed, at the surface forming small stroma-like aggregations of dark brown pseudoparenchymatous cells (6–)11–15(–25) μm diam (x̄ = 14 μm). Conidiophores (60–)165–270(–310) × (5–)7–9(–12) μm (x̄ = 200 × 8 μm, n = 30), 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, (4–)12–15-septate. Conidiogenous cells terminal and intercalary, polytretic, with well-defined thick, pale brown pores. Conidia (30–)45–60(–70) × 6–9 μm (x̄ = 50 × 7 μm, n = 30), obpyriform to lageniform, straight or curved, smooth-walled, subhyaline to light brown, 5–8-distoseptate, with a thick scar at the base.

 

Culture conditions: Culture on MEA, colony yellow-green at the center, turn-ing dull green, pale yellow next, becoming dull green again, pale yellow, and white toward the margin. Colony smooth, dense at the middle, zonate, fluffy at the margin.

 

 

Helminthosporiella stilbacea (MFLU 20-0521, holotype) (A) A coconut plantation in Prachuap Khiri Khan Prov-ince. (B) Palm samples. (C–E) Conidiogenesis. (F–H) Conidiophores (at red arrow are pores). (I–M) Conidia. (N, O) Germinated conidia. (P) Culture on MEA. Scale bars: B = 2 cm, C, I–O = 20 μm, D–H = 50 μm.

 

Reference

Konta, S; Hyde, KD; Karunarathna, SC; Mapook, A; Senwanna, C; Dauner, LAP; Nanayakkara, CM; Xu, J; Tibpromma, S; Lumyong, S. (2021) Multi-Gene phylogeny and morphology reveal Haplohelminthosporium gen. nov. and Helminthosporiella gen. nov. associated with palms in Thailand and a checklist for Helminthosporium reported worldwide. Life. 11(5, no. 454):1–53

 

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