Cercospora cyperina Nguanhom, Crous & U. Braun, 2015
publication ID |
https://doi.org/ 10.11646/phytotaxa.233.1.2 |
DOI |
https://doi.org/10.5281/zenodo.13631920 |
persistent identifier |
https://treatment.plazi.org/id/03B08788-4E10-F164-94B8-C998EE4239D8 |
treatment provided by |
Felipe |
scientific name |
Cercospora cyperina Nguanhom, Crous & U. Braun |
status |
sp. nov. |
Cercospora cyperina Nguanhom, Crous & U. Braun , sp. nov. ( Fig. 4 View FIGURE 4 ). MycoBank MB812920
Type: — THAILAND. Chiang Mai: on leaves of Cyperus alternifolius ( Cyperaceae ), 12 May 2013, S. Seekanha (holotype CBS H-22291, culture ex-type CPC 23919 = CBS 140166).
Leaf spots amphigenous, pale brown to brown, margin indefinite, elongated to irregular. Mycelium internal. Caespituli amphigenous, punctiform, brown. Stromata none or composed of 2−3 brown cells. Conidiophores loosely fasciculate, with fascicles of 2−9 conidiophores, brown, paler towards the apex, cylindrical to geniculate, somewhat constricted at septa, branched, 2−6-septate, 73−138 × 5−6 μm. Conidiogenous cells proliferating sympodially 1−6 times, integrated, terminal and intercalary, 20–38 μm long; conidiogenous loci conspicuous, thickened and darkened, multi-local, formed apical or on shoulders caused by proliferation, 2.5−4 μm diam. Conidia solitary, hyaline, thin-walled, smooth, acicular to somewhat obclavate, subobtuse at the apex, truncate to slightly obconically truncate at the base, 55−155 × 2.5−4 μm, indistinctly 15–20-septate, hila slightly thickened, darkened and refractive, 2.5–3 μm diam.
Culture characteristics:— Colonies spreading, low convex, with sparse to moderate aerial mycelium, entire margin and folded surface, reaching 44 mm diam after 2 wk. On MEA surface whitish with patches of greyish rose; reverse olivaceous-black. On PDA surface whitish, pale grey at the centre with diffuse red pigment surrounding the colony; reverse olivaceous-black. On OA whitish with patches of pale grey, but red at the margin; reverse olivaceous-grey.
Etymology: —Epithet derived from the host genus, Cyperus .
Notes: — Cercospora cyperina is morphologically close to C. cyperi Sawada ( Braun et al. 2014) but distinct by having longer, distinctly geniculate conidiophores with constrictions and much larger conidiogenous loci, 3–4 μm diam [conidiophores (10–)20–90 μm long, without constrictions, loci (1–)1.5–2(–2.5) μm diam in C. cyperi ]. This taxon was also supported as a new species based on its distinct phylogenetic position. In the combined tree ( Fig. 1 View FIGURE 1 ), it is sister to C. cyperacearum and thus separate from other species occurring on Cyperus .
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.