Genus Cercospora in Thailand: Taxonomy and Phylogeny (with a ...

Distribution – China, Thailand (Crous &
Braun 2003, Meeboon et al. 2007c).
Notes – The first report of this species
from Thailand was made by Meeboon et al.
(2007c).
Cercospora barleriicola Payak & Thirum.,
Indian Phytopath. 2: 191 (1949).
= Cercospora barleriae-cristatae
Govindu & Thirum., Sydowia 10: 273 (1957).
(= C. apii s. lat.) (Fig. 13)
Leaf spots 5 – 8 mm diam., amphigenous,
dark to yellowish, only leaf decoloration. Caespituli
amphigenous. Stromata 20–24 μm diam.,
small, substomatal, composed of a few subglobose,
and dark brown cells. Conidiophores
85–209 × 3–4 μm, 5–7 in loose fascicles, 5–8septate,
arising from stromata, straight, unbranched,
cylindrical, slightly geniculate near
Plant Pathology & Quarantine
the apex, smooth, brown at the base, paler
towards the apex. Conidiogenous cells integrated,
holoblastic, polyblastic, sympodially
proliferating. Conidiogenous loci 2–3 μm diam.,
conspicuous, thickened, and darkened. Conidia
61–91 × 2–3 μm, solitary, acicular, straight,
hyaline, 6–13-septate, smooth, truncate at the
base, tapering toward a subacute apex, hila
1.5–2 μm diam., conspicuous, thickened and
darkened.
Specimens examined – THAILAND,
Chiang Mai Province, Chiang Dao District,
Huay Luek Royal Project, on leaves of
Barleria cristata L. (Acanthaceae), 6 February
2008, Jamjan Meeboon and Iman Hidayat
(BBH 23592); Uttradit Province, A. Nam Pad,
Sak Yai National Park, same host, 25
November 2004, Chiharu Nakashima and
Jamjan Meeboon (CMU 27885).
Fig. 13 – Line drawings of Cercospora barleriicola on Barleria cristata. a. Conidia. b. Stroma and
conidiophores. Bars = 25 µm. (Meeboon et al. 2007b).
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