Alternaria redefined - CBS - KNAW

Alternaria redefined
Fig. 15. Alternaria sect. Japonicae: conidia and conidiophores. A–B. A. japonica. C–E. A. nepalensis. Scale bars = 10 µm.
Fig. 16. Alternaria sect. Nimbya: conidia and conidiophores. A–B. A. caricis. C–D. A. scirpicola. Scale bars = 10 µm.
Section Japonicae Woudenb. & Crous, sect. nov.
MycoBank MB803741. Fig. 15.
Type species: Alternaria japonica Yoshii
Diagnosis: Section Japonicae contains short to long, simple
or occasionally branched primary conidiophores with a single
conidiogenous locus. Conidia are short, to long-ovoid with
transverse and longitudinal septa, conspicuously constricted at
most of the transverse septa, in short chains. Apical secondary
conidiophores are produced with a single conidiogenous locus. The
species within this section occur on Brassicaceae.
Note: Alternaria japonica was previously connected to the A.
brassicicola species-group (Pryor & Gilbertson 2000, Pryor &
Bigelow 2003, Lawrence et al. 2013), but this association was
questioned by Hong et al. (2005).
Alternaria japonica Yoshii, J. Pl. Protect. 28: 17. 1941.
= Alternaria matthiolae Neerg., Danish species of Alternaria and Stemphylium:
184. 1945.
Alternaria nepalensis E.G. Simmons, CBS Biodiversity Ser.
(Utrecht) 6: 480. 2007.
Section Nimbya (E.G. Simmons) Woudenb. & Crous,
comb. et stat. nov. MycoBank MB803742. Fig. 16.
Basionym: Nimbya E.G. Simmons, Sydowia 41: 316. 1989.
Type species: Alternaria scirpicola (Fuckel) Sivan.
Diagnosis: Section Nimbya contains simple, short to moderately
long conidiophores, which may form one or a few short to long,
geniculate, sympodial proliferations. Conidia are narrowly elongateobclavate,
gradually tapering apically, solitary or in short chains,
with transverse disto- and eusepta, sometimes slightly constricted
near eusepta. Apical condiophores with a single conidiogenous
locus can be formed. Internal compartmentation occurs, cell lumina
tend to be broadly octagonal to rounded. A sexual morph may
occur.
Notes: Section Nimbya contains the type species of Nimbya, N.
scirpicola, and N. caricis (Simmons 1989). A more extensive study
on Nimbya (Lawrence et al. 2012) found that N. scirpinfestans and
N. scirpivora also belonged to this section based on sequences of
the GAPDH, ITS and Alt a 1 genes.
Alternaria caricis (E.G. Simmons) Woudenb. & Crous, comb.
nov. MycoBank MB803700.
Basionym: Nimbya caricis E.G. Simmons, Sydowia 41: 328. 1989.
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