Capnodiales » Mycosphaerellaceae » Cercospora

Cercospora capsici

Cercospora capsici Heald & F.A. Wolf, Mycologia 3 (1): 15 (1911)

Facesoffungi number: FoF04570

 

Saprobic on dead leaves of Pandanus amaryllifolius. Mycelium superficial, rough, branched, septate, light brown to dark brown. Sexual morph: Undetermined. Asexual morph: Hyphomycetous. Caespituli fasciculate to sporodochial, brown to dark brown, thick-walled, predominantly epiphyllous. Conidiophores 90–215 × 4–7 μm ( x̄ = 160 × 5 μm, n = 20), aggregated in dense fascicles, pale brown, cylindrical, up to 6-septate, branched, roughened with scars, straight to curved. Conidiogenous cells 20–65 × 4–7 μm (x̄ = 45 × 6 μm, n = 20), holoblastic, integrated, cylindrical, pale brown, hyaline at the apex, thick-walled. Conidia 85–220 × 4–8 μm (x̄ = 151 × 6 μm, n = 20), cylindrical, base truncate with distinctive scar, apex rounded, solitary, hyaline, straight to slightly curved, guttulate, up to 15-septate, not constricted at septa, thick-walled, without a mucilaginous sheath.

 

Culture characteristics: Conidia germinating on MEA within 12 hr. Colonies on MEA, circular, entire edge, smooth, pulvinate, white grey in middle, white at margin, velvety.

 

Material examined: THAILAND, Chiang Mai Province, Mae Taeng District, Mushroom Research Foundation, on dead leaf of Pandanus amaryllifolius Roxb., 16 December 2017, S. Tibpromma P12 (MFLU 18– 0031, HKAS 101799); living culture, MFLUCC 18– 0117, GenBank numbers LSU: MH260285; ITS: MH275053; SSU: MH260331; TEF1: MH412762; RPB2: MH412752; TUB2: MH412741.

 

Notes: Cercospora sp. was recorded from Thailand on Pandanus amaryllifolius (Thongkantha et al. 2008). We also collected Cercospora from Pandanus amaryllifolius in Thailand, but unfortunately cannot compare the morphology with the species in Thongkantha et al. (2008) as it lacked a description. Cercospora capsici (MFLUCC 18– 0117) grouped with C. sojina (CPC 12322) and C. capsici (CBS 118712). Cercospora capsici has acicular conidia, 2–12-septate and subacute at the apex (Groenewald et al. 2013), while C. sojina has cylindrical to obclavate or fusiform conidia, with 1–5-septate (Crous et al. 2013). However, when comparing the nucleotide sequences our isolate is almost identifical with Cercospora capsici (CBS 118712 and CPC 12307) with three ITS base pair (0.59%) differences.

 

 

Figure X. Cercospora capsici (MFLU 18-0031). a Colonies on dead leaves of Pandanus amaryllifolius. b Conidiophores, conidiogenous cells and conidia. c-e Conidiogenous cells and conidia. f, g Conidia. h, i Colonies on MEA from above and below. Scale bars: b = 100 μm, c– g = 20 μm.

 

Reference: Tibpromma S, Hyde KD, McKenzie EHC, Bhat DJ, et al.  (2018) Fungal diversity notes 840–928: micro-fungi associated with Pandanaceae. Fungal Diversity 92:1–160.

 

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