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

ase, paler toward the apex, unbranched,
cylindrical, geniculate, sinuous at the apex.
Conidiogenous cells integrated, terminal, holoblastic,
polyblastic, sympodially proliferating.
Conidiogenous loci 2–3 μm diam., conspicuous,
thickened and darkened. Conidia 25–280 × 1–3
μm, solitary, obclavate to acicular, straight,
hyaline, 5–24-septate, smooth, truncate at the
base, tapering toward a subacute apex, hila
0.5–2 μm diam., conspicuous, thickened and
darkened.
Specimens examined – THAILAND,
Doi Sa Ket, Chiang Mai Province, on leaves of
P. bifurcatum (Cav.) C. Chr., 5 July 2006,
Jamjan Meeboon (CMU 27904); Chiang Mai
Province, T. Sansai, on leaves of P. wallichii
Hook. (Polypodiaceae), 12 September 2007,
Parin Noiruang (BBH 23741); Chiang Mai
Province, Pang Da Royal Project, on leaves of
P. wallichii, 5 August 2008, Jamjan Meeboon
(BBH 23733).
Hosts – Platycerium bifurcatum, Platycerium
sp. (Polypodiaceae) (Crous & Braun,
2003, Meeboon et al. 2007b,c).
Distribution – Thailand, USA (Crous &
Braun 2003, Meeboon et al. 2007b,c).
Notes – The first record of C. platycerii
from Thailand was by Meeboon et al. (2007b, c)
on P. wallichii and P. bifurcatum.
Pteridaceae
Cercospora cyclosori Goh & W.H. Hsieh,
Trans. Mycol. Soc. R.O.C. 4: 26 (1989).
≡ Cercospora cyclosori Sarbajna &
Chattopadh., J. Mycopathol. Res. 28: 14 (1990)
(nom. illeg.), homonym of C. cyclosori Goh &
W.H. Hsieh (1989).
(= C. apii s. lat.) Fig 58
Leaf spots 2–8 mm diam., amphigenous,
irregular, white to pale at the center, with
brown margin, sometimes limited by vein.
Caespituli amphigenous. Stromata 23–55 μm
diam., substomatal, small to well-developed,
composed of a few subglobose, brown-walled
cells. Conidiophores 111–190 × 3–5 μm, 9–17
in loose fascicules, 5–7-septate, arising through
stromata, straight, smooth, brown at the base,
paler toward the apex, unbranched, cylindrical,
not geniculate. Conidiogenous cells integrated,
holoblastic, monoblastic, terminal, sympodially
proliferating. Conidiogenous loci 2–3 μm diam.,
Plant Pathology & Quarantine
Fig. 58 – Line drawings of Cercospora
cyclosori on Pteris biaurita. a. Conidia. b.
Conidiophores and stromata. Bars = 50 μm.
(Meeboon 2009).
conspicuous, thickened and darkened. Conidia
179–283 × 2.5–3.5 μm, solitary, acicular,
straight, hyaline, 14–25-septate, smooth, truncate
at the base, tapering toward a subacute
apex, hila 1.5–2 μm diam., conspicuous,
thickened and darkened.
Specimen examined – THAILAND,
Chiang Mai Province, Mae Jam District, Mae-
Hae Royal Project Area, on leaves of Pteris
biaurita L. (Pteridaceae), 12 February 2008,
Jamjan Meeboon and Iman Hidayat (BBH
23617).
Hosts – Cyclosorus acuminatus,
Cyclosorus sp. (Thelypteridaceae) (Crous &
Braun 2003), Pteris biaurita L. (Pteridaceae)
(Meeboon 2009).
Distribution – India, Taiwan, Thailand
(Crous & Braun 2003, Meeboon 2009).
Notes – This specimen is close to C.
cyclosori in having dark brown symptoms,
amphigenous caespituli, conidiophores in
divergent fascicles and long acicular conidia
with truncate base (Hsieh & Goh 1990). Crous
& Braun (2003) assigned this species to
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