Pleosporales » Massarinaceae » Haplohelminthosporium

Haplohelminthosporium calami

Haplohelminthosporium calami

Konta & K.D. Hyde (2021)

 

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

 

Host species: Calamus sp. (Konta et al. 2021)

 

Holotype: MFLU 20-0520 (Konta et al. 2021)

 

Known distribution: Krabi, Thailand

 

IF Number: IF557874       Mycobank Number: 557874    FOF Number: FoF09170

 

Description

Saprobic on living leaves and petioles of Calamus sp. On living leaves, small spots, circular to irregular, yellow in the beginning, later becoming red-brown surrounded by yellow. Colonies on natural substrate forming black patches on the upper leaf, petiole surfaces. Sexual morph: Undetermined. Asexual morph: Mycelium mostly immersed, on the surface forming small stroma-like aggregations of red brown pseudoparen-chymatous stromal cells (7–)10–14(–20) μm (x̄ = 12 μm). Conidiophores (110–)140–175(–215) × (4–)5–7(–8) μm (x̄ = 160 × 6 μm, n = 50), wide at the base and apex, mac-ronematous, mononematous, arising singly or fasciculate from the stroma cells, erect, simple, unbranched, straight, curved and swollen at the apex, thick-walled, cylindrical, smooth, bulbous at base, hyaline in the middle, brown to red-brown at 1–2-cells above the base, pale brown to red brown at the last cell of the apex, (3–)4–5(–6) septa. Conidiogenous cells monotretic, terminal, determinate, cylindrical, with well-defined small noncicatrized pores at the apex, wide and yellow-brown at the apex. Conidia (55–)70–100(–120) × (13–)17–20(–23) μm (x̄ = 80 × 20 μm, n = 60), one on each conidiophore, obpyriform to lageniform, straight or curved, smooth, olive-brown, (3–)4–6(–7)-distoseptate, with a dark scar at the base.

 

Culture conditions: Culture on PDA, colony yellow-gray-brown at the center, turning dull creamy white toward to margin, smooth, dense, zonate at the margin.

 

 

Haplohelminthosporium calami (MFLU 20-0520, holotype) (A) The forest in Krabi Province. (B–E) Fresh and herbarium palm samples. (F, G) Colonies on living leaf. (H–L) Conidiophores. (M–U) Conidia. (V, W) Germinated conidia. (X) Culture on PDA. (Y) Conidiophore and conidia on culture. (Z) Conidiogenesis. (AA) Conidiophores. (AB, AC) Conidia. Scale bars: C, E = 2 cm, H–W, Y–AC = 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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