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

Fungi imperfecti parasitici 1. Hyphomycetes:
339 (1937).
= Cercospora hydrangeana Tharp,
Mycologia 9: 110 (1917).
≡ Cercosporina hydrangeana (Tharp)
Sacc., Syll. Fung. 25: 915 (1931).
= Cercospora arborscentis Tehon & E.
Daniels, Mycologia 17: 246 (1925).
(= C. apii s. lat.) Fig. 47
Leaf spots 3–15 mm diam., amphigenous,
irregular, pale olivaceous to light
brown, centre greyish brown to greyish white
with purplish brown to dark brown margins.
Caespituli amphigenous. Stromata lacking.
Conidiophores 111–227 × 3.5–5 μm, 3–11 in
loose fascicles, 1–3-septate, straight to decumbent,
unbranched, smooth, very dark brown at
the base, and paler toward the apex, cylindrical,
strongly geniculate. Conidiogenous cells integrated,
holoblastic, polyblastic, sometimes
monoblastic when young, sympodially proliferating.
Conidiogenous loci 2–3 μm diam.,
conspicuous, thickened and darkened. Conidia
113–278 × 2.5–3.5 μm, acicular, hyaline, 13–
27-septate, solitary, slightly curved at the apex,
base obconically truncate, hila 1.5–2.5 μm
diam., conspicuous, thickened and darkened.
Specimens examined – THAILAND,
Chiang Mai Province, Suthep-Pui National
Park, on leaves of Hydrangea macrophylla
(Thunb.) Ser. (Hydrangeaceae), 21 November
2004, Jamjan Meeboon (CMU 27921); Chiang
Mai Province, Sanpatong District, Mae Wang
Sub-district, T. Mae Win, Bahn Mae Sapok,
Mae Sapok Royal Project, on same host, 8
February 2008, Jamjan Meeboon and Iman
Hidayat (BBH 23567).
Hosts – Hydrangea angustisepala, H.
arborescens, H. hortensis, H. macrophylla, H.
opuloides, H. paniculata, H. serrata, Hydrangea
sp. (Hydrangeaceae) (Crous & Braun
2003).
Distribution – Argentina, Borneo, Brazil,
Brunei, China, Hong Kong, India, Iran, Japan,
Korea, Malawi, Malaysia, Myanmar, Nigeria,
Philippines, Puerto Rico, Romania, Russia
(Asian part), Sabah, Sierra, Leone, Singapore,
Taiwan, Thailand, USA, Virgin Islands,
Zimbabwe (Crous & Braun 2003).
Notes – The first record of this species
from Thailand was by Petcharat &
Plant Pathology & Quarantine
Fig. 47 – Line drawings of Cercospora
hydrangeae on Hydrangea macrophylla. a.
Conidiophores and stromata. b. Conidia. Bars
= 50 μm. (Meeboon 2009).
Kanjanamaneesathian (1989), but they did not
give any detailed morphological description
and illustration for this fungus. Braun (2000)
assigned this species to C. apii s.lat.
Literature – Chupp (1954, p. 517).
Lamiaceae
Cercospora kabatiana Allesch. ex Lindau,
Rabenh. Krypt.- Fl. ed. 2, 9: 130 (1910).
≡ Cercospora kabatiana (Allesch. ex
Lindau) Moescz, Magyar Biol. Kutatόint.
Munkái 3: 115 (1930). Fig.48
Leaf spots 15–30 mm diam., amphigenous,
circular or subcircular, at first pale
greenish to ochraceous, later become dull
brown, finally with pale to greyish white at the
centre, surrounded by a dark margin. Caespituli
amphigenous. Stromata lacking. Conidiophores
78–185 × 3–5 μm, numerous in loose
fascicules, 2–5-septate, arising from stromata,
simple, straight, erect to decumbent, smooth,
pale yellow to pale brown, rarely branched,
subcylindrical, geniculate. Conidiogenous cells
65