Cercospora musigena Nguanhom, Crous & U. Braun, 2015

Nguanhom, Jeerapa, Cheewangkoon, Ratchadawan, Groenewald, Johannes Z., Braun, Uwe, To-Anun, Chaiwat & Crous, Pedro W., 2015, Taxonomy and phylogeny of Cercospora spp. from Northern Thailand, Phytotaxa 233 (1), pp. 27-48 : 43

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).

S

Department of Botany, Swedish Museum of Natural History

CBS

Centraalbureau voor Schimmelcultures, Fungal and Yeast Collection

CPC

Culture collection of Pedro Crous

PDA

Royal Botanic Gardens

Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF