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

smooth, pale brown to brown, unbranched,
subcylindrical, slightly geniculate. Conidiogenous
cells integrated, terminal, holoblastic,
monoblastic to polyblastic, sympodially proliferating.
Conidiogenous loci 2–3 μm diam.,
conspicuous, thickened, and darkened. Conidia
25–170 × 3–3.5 μm, solitary, narrowly
obclavate to subacicular, 3–12-septate, straight,
hyaline, smooth, base obconically truncate,
with acute apex, hila 2–3 μm diam., thickened
and darkened.
Specimen examined – THAILAND,
Chiang Mai Province, Royal Flora, on leaves
of Pentalinon luteum (L.) B.F. Hansen &
Wunderlin (Apocynaceae), 27 July 2008,
Jamjan Meeboon (BBH 23762).
Hosts – Tabernamontana coronaria, T.
divaricata (Apocynaceae) (Crous & Braun
2003), Pentalinon luteum (Meeboon 2009).
Distribution – India, Mexico, Pakistan,
Thailand, USA (Crous & Braun 2003,
Meeboon 2009).
Notes – This specimen is a typical of C.
apii s. lat fide Crous & Braun (2003) due to
long and slightly geniculate conidiophores, and
long acicular conidia with truncate base and
acute apex. Cercospora peregrina is the only
one C. apii s. lat. reported from plants family
Apocynaceae. This specimen was first reported
from Thailand by Meeboon (2009).
Arecaceae
Cercospora arecacearum Hidayat & Meeboon,
Mycol. Prog. 8: 115-121 (2009a).
MycoBank 510616 (Fig. 19)
Leaf spots – 1–10 cm diam., amphigenous,
irregular, brown to dull greyish brown,
finally pale greyish with a white center and
dark margins, spots usually overlapping. Caespituli
amphigenous, scattered, dark yellowish.
Stromata 30–100 µm diam., substomatal to
intraepidermal, well-developed, subglobular,
brown to blackish brown. Conidiophores 68.5–
310 × 4–5 µm, variable in length, in dense
fascicles, 2–8-septate, arising from stromata,
smooth, pale yellowish to brownish throughout,
sometimes paler at the apex, cylindrical, but
narrowed towards the apex, straight, branched,
strongly geniculate. Conidiogenous cells 24.5–
67 × 4–5 µm, integrated, terminal, sympodially
Plant Pathology & Quarantine
Fig. 18 – Line drawings of Cercospora
peregrina on Pentalinon luteum. a. Conidia. b.
Stromata and conidiophores. Bars: a = 50 μm,
b = 40 μm. (Meeboon 2009).
proliferating. Conidiogenous loci 2.5–3 µm
diam., conspicuous, thickened and darkened.
Conidia 140–320 × 4–5 µm, acicular, straight,
often curved at the apex, hyaline, 9–25-septate,
thin-walled, smooth, tapered towards a
subacute apex, base truncate, hila 2–3 µm
diam., thickened and darkened.
Specimen examined – THAILAND,
Chiang Mai province, Mae Taeng District, T.
Pa Pae, Mushroom Research Centre, on leaf
spots of Areca catechu L. (Arecaceae), 17
November 2006, Iman Hidayat (CMU 27946:
Holotype).
Habitat – Areca catechu (Arecaceae)
(To-anun et al. 2009).
Distribution – Thailand (type locality)
(To-anun et al. 2009).
Notes – According to Crous & Braun
(2003), this species belongs to Cercospora s.
str., which is characterized by having pigmented
conidiophores, thickened and darkened
conidiogenous loci, and hyaline scolecoid
conidia. This fungus is distinct from the
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