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

Leaf spots 2–15 mm diam., amphigenous,
irregular, brown to dark brown, pale at
the center, with dark margin, limited by leaves
vein. Caespituli amphigenous. Stromata 10.5-
19 μm diam., substomatal to intraepidermal,
small, composed of few globose to subglobose,
brown-walled cells. Conidiophores 27.5–54 ×
2.5–5.5 μm, 3–8 in loose to dense fascicules,
1–3-septate, straight to decumbent, smooth,
brown at the base, paler toward the apex,
unbranched, cylindrical, strongly geniculate.
Conidiogenous cells integrated, terminal, holoblastic,
polyblastic, sympodially proliferating.
Conidiogenous loci 1.5–2.5 μm diam., conspicuous,
thickened and darkened. Conidia 46.5–
160 × 2–4 μm, solitary, obclavate to acicular,
straight, slightly curved, hyaline, 7–15-septate,
smooth, obconically truncate at the base,
tapering toward a subacute apex, hila 1–2.3 μm
diam., thickened and darkened.
Specimens examined – THAILAND,
Phetchabun Province, Num Nao National Park,
on leaves of Capsicum frutescens L.
Plant Pathology & Quarantine
(Solanaceae), 24 November 2004, Chiharu
Nakashima and Jamjan Meeboon (CMU
27965); the same host, Chiang Mai Province, A.
Sarapee, 28 November 2006, Jamjan Meeboon
(CMU 28065); Chiang Mai Province, Doi
Suthep-Pui National Park, on leaves of C.
annuum L., 2 October 2005, Jamjan Meeboon
(CMU 27938); Chiang Rai Province, Wiang Pa
Pao, on leaves of C. annuum var. acuminatum
Fingerh (Solanaceae), 2 February 2008, Jamjan
Meeboon (BBH 23602); Chiang Mai Province,
A. Mae Taeng, on leaves of Nicotiana tabacum
L. (Solanaceae), 6 February 2008, Jamjan
Meeboon (BBH 23668); Chiang Mai Province,
San Sai, Mae Fag, on leaves of C. annuum, 3
August 2008, Jamjan Meeboon (BBH 23750);
Chiang Mai Province, Chiang Mai University,
Multiple Cropping Centre, on leaves of
Solanum nigrum L. (Solanaceae), 1 August
2008, Jamjan Meeboon (BBH 23612); Chiang
Mai Province, Suthep-Pui National Park, on
leaves of S. verbascifolium L., 25 July 2008,
Jamjan Meeboon (BBH 23769).
Fig. 62 – Line drawings of Cercospora physalidis on Solanum nigrum. a. Conidiophores and
stromata. b. Conidia. Bars = 50 μm. (Meeboon 2009).
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