Cercospora musigena Nguanhom, Crous & U. Braun, 2015
publication ID |
https://doi.org/ 10.11646/phytotaxa.233.1.2 |
DOI |
https://doi.org/10.5281/zenodo.13631926 |
persistent identifier |
https://treatment.plazi.org/id/03B08788-4E0F-F17A-94B8-C998E9633EF8 |
treatment provided by |
Felipe |
scientific name |
Cercospora musigena Nguanhom, Crous & U. Braun |
status |
sp. nov. |
Cercospora musigena Nguanhom, Crous & U. Braun , sp. nov. ( Fig. 5 View FIGURE 5 ). MycoBank MB812921
Type:— THAILAND. Chiang Mai: on leaves of Musa sp. ( Musaceae ), 27 May 2013, S. Seekanha (holotype CBS H-22292, culture ex-type CPC 24809 = CBS 140167, CPC 24831).
Leaf spots irregular, pale brown along the leaf margins, often surrounded by a yellow halo. Caespituli amphigenous, punctiform, brown. Stromata intraepidermal to subepidermal, brown, 30−45 μm diam. Conidiophores in moderately large fascicles (11−20 per fascicle), erumpent through the cuticle, brown, paler toward the apex, 3−5-septate, cylindrical, 1−3 times geniculate in upper part, tapering to flat-tipped loci, branched, 30−75 × 4−5 μm. Conidiogenous cells proliferating sympodially 1−4 times, integrated, terminal, rarely intercalary; conidiogenous loci distinct, apical or formed on shoulders due to sympodial proliferation, thickened and darkened, protruding, 2−3 μm diam. Conidia solitary, hyaline, straight to mildly curved, acicular, truncate at the base, obtuse at the apex, thin-walled, smooth, 15−130 × 3−5 μm, 2−20-septate, hila thickened, darkened, 2–2.5 μm diam.
Culture characteristics: —Colonies spreading, flat, with sparse to dense aerial mycelium, even margin, reaching 48 mm diam after 2 wk. On MEA surface pale purplish grey, with rosy buff outer region; reverse sepia. On PDA surface vinaceous-buff, with red diffuse pigment surrounding culture; reverse bay. On OA surface whitish, with patches of grey; reverse chestnut, with rust in outer region.
Etymology: —Named after the host from which it was isolated, Musa sp.
Notes: — Cercospora musigena is similar to C. hayi Calp. by its acicular conidia with truncate bases, being part of the C. apii complex ( Braun et al. 2014). In C. hayi , however, there are fewer conidiogenous loci per conidiogenous cell, and the conidial tips are acute to subacute ( Calpouzos 1955). C. apii s. lat. (including C. hayi ) on Musa spp. is genetically heterogeneous. Sequences retrieved from C. apii -like cultures isolated from banana clustered in three different clades ( Groenewald et al. 2013). However, the identity of the name C. hayi is still unresolved and will need to be clarified by means of epitypification ( Braun et al. 2014).
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