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

Hosts – Barleria cristata, B. prionitis,
Barleria sp. (Acanthaceae) (Crous & Braun
2003, Meeboon et al. 2007b).
Distribution – India, Jamaica, Thailand
(Crous & Braun 2003, Meeboon et al. 2007b).
Notes – This species belongs to C. apii s.
lat. fide Crous & Braun (2003). The first report
of this species from Thailand was carried out
by Meeboon et al. (2007b).
Literature – Chupp (1954, p. 22).
Adiantaceae
Cercospora adiantigena U. Braun & Crous,
CBS Biodiversity Series 1: 44–45 (2003).
(Fig. 14)
Leaf spots – 5–15 mm diam.,
amphigenous, solitary, circular, brown to dark
brown, with dark margin and grey at the center.
Caespituli amphigenous. Stromata 9–43 μm
32
diam., substomatal to intraepidermal, small to
well-developed, composed of few subglobose,
brown to blackish brown cells. Conidiophores
74–106 × 3–4 μm, 6–11 in loose fascicles, 1–3septate,
arising from stromata, straight to decumbent,
smooth, brown at the base, and paler
toward the apex, cylindrical, unbranched, geniculate.
Conidiogenous cells integrated, terminal,
holoblastic, mostly polyblastic, sympodially
proliferating. Conidiogenous loci 1.5–2.5 μm
diam., conspicuous, thickened and darkened.
Conidia 53–60 × 2–3 μm, solitary, obclavate,
straight to slightly curved, hyaline, 7–16septate,
smooth, obconically truncate at the
base, tapering toward a subacute apex, hila
1.5–2 μm diam., thickened and darkened.
Specimen examined – THAILAND,
Chiang Mai Province, A. Mae Rim, Nong Hoi
Royal Project Foundation, on leaves of
Doryopteris ludens J. Sm. (Adiantaceae), 12
September 2007, Parin Noiruang (BBH 23634)
Fig. 14 – Line drawings of Cercospora adiantigena on Doryopteris ludens. a. Conidia. b. Stroma
and conidiophores. Bars = 50 µm. (Meeboon 2009).