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Crous et al.
Fig. 11. Cercospora sojina (CPC 12322). A. Leaf spots on upper and lower leaf surface. B. Close-up of lesion. C–G. Fascicles with conidiophores and conidiogenous cells. H.
Conidia. Scale bars = 10 μm.
smooth, lobate margins. Surface folded, dark mouse-grey with
patches of dirty white; reverse fuscous black becoming greyish
sepia at margin. Colonies reaching 12 mm diam.
Specimens examined: South Korea, Chuncheon, on Eucommia ulmoides, 7 Oct.
2003, H.D. Shin, holotype CBS H-20839, cultures ex-type CPC 10802 = CBS
131932, CPC 10803, 10804; Chuncheon, on E. ulmoides, 11 Oct. 2002, H.D. Shin,
CBS H-20838, culture CPC 10047.
Notes: In the Korean material C. eucommiae occurred in mixed
infections with a Pseudocercospora species (conidia 22–160 ×
4–7 μm) that resembles P. eucommiae (conidia 15–75 × 2–4 um),
which is known from this host in China (Guo & Hsieh 1995). The
description of C. eucommiae reveals the genus Cercospora to be
paraphyletic. Morphologically C. eucommiae is distinct from other
species in Cercospora in that the conidial hila and conidiogenous
scars are different (thickened along the rim, not darkened and
planate), and conidia also tend to occur in unbranched chains,
which is not typical of Cercospora. Interestingly, it does not cluster
with C. eremochloae, which also forms conidia in chains (Crous et
al. 2011a). Although this species is not part of Cercospora s. str.,
we name it in this genus until further taxa are collected and studied
to resolve the status of this subclade in relation to Cercospora s. str.
Miuraea Hara, Byochugai-Hoten (Manual of Pests and
Diseases): 779. 1948.
Synonyms: See Braun (1995).
Foliicolous, phytopathogenic, causing leaf spots. Mycelium internal
and external, consisting of septate, branched, hyaline to subhyaline
hyphae. Conidiophores semi-macronematous, mononematous,
reduced to a single conidiogenous cell, integrated on hyphae, with
small lateral peg-like protuberances; conidiogenesis holoblastic,
monoblastic, determinate, occasionally polyblastic, proliferation
sympodial or percurrent; conidiogenous loci more or less truncate,
inconspicuous, unthickened, not darkened. Conidia solitary,
ellipsoid-ovoid, subcylindrical-vermiform, obclavate, subclavate,
somewhat asymmetrical, euseptate, transversely pluriseptate to
muriformly septate, hyaline to faintly pigmented, thin-walled; hila
truncate to somewhat convex, unthickened, not darkened (adapted
from Braun 1995).
Type species: Miuraea degenerans (Syd. & P. Syd.) Hara,
Byochugai-Hoten (Manual of Pests and Diseases): 260. 1948.
Notes: Morphologically Miuraea is intermediate between
Pseudocercospora and Pseudocercosporella, which explains
its phylogenetic position in this clade (Fig. 4). It differs from
Pseudocercosporella in having superficial mycelium, and very
broad, muriformly septate conidia.
Miuraea persicae (Sacc.) Hara, Byochugai-Hoten (Manual
of pests and diseases): 224. 1948. Fig. 13.
Basionym: Cercospora persicae Sacc., Hedwigia 15: 119. 1876.
Teleomorph: “Mycosphaerella” pruni-persicae Deighton, Trans.
Brit. Mycol. Soc. 50: 328. 1967.
Specimens examined: South Korea, Chuncheon, Prunus persica, 11 Oct. 2002,
H.D. Shin, CBS H-20841, culture CPC 10069; Chuncheon, 7 Oct. 2003, P.
armeniaca, H.D. Shin, CBS H-20840, CPC 10828–10830.
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