Alternaria redefined - CBS - KNAW

Alternaria redefined
Fig. 3. Alternaria sect. Alternantherae: conidia and conidiophores. A–D. A. alternantherae. E–H. A. perpunctulata. Scale bars = 10 µm.
ALTERNARIA SECTIONS
Section Alternantherae D.P. Lawr., Gannibal, Peever
& B.M. Pryor, Mycologia 105: 540. 2013. Fig. 3.
Type species: Alternaria alternantherae Holcomb & Antonop.
Diagnosis: Section Alternantherae contains short to moderately
long conidiophores with a conidiogenous tip which can be enlarged.
Conidia are narrowly ellipsoid or ovoid, sometimes subcylindrical,
solitary or rarely paired, sometimes slightly constricted near some
septa, longitudinal or oblique septa occasionally occur, disto- and
euseptate, with a long apical narrow beak. The conidial beak is
unbranched, septate or aseptate, long filiform, and sometimes
swollen at the end. Internal compartmentation occurs, cell lumina
tend to be broadly octagonal to rounded.
Notes: Section Alternantherae was recently established by
Lawrence et al. (2013) after first being described as speciesgroup
A. alternantherae (Lawrence et al. 2012). The described
section consists of three former Nimbya species which formed
a separate clade amidst the Alternaria species-groups based
on sequences of the GAPDH, ITS and Alt a 1 genes (Lawrence
et al. 2012). Nimbya celosiae is placed in this section based
on the data of Lawrence et al. (2012), while N. gomphrenae is
placed in the section based on ITS sequence data from Chou
& Wu (2002).
Alternaria alternantherae Holcomb & Antonop., Mycologia 68:
1126. 1976.
≡ Nimbya alternantherae (Holcomb & Antonop.) E.G. Simmons & Alcorn,
Mycotaxon 55: 142. 1995.
Alternaria celosiicola Jun. Nishikawa & C. Nakash., J.
Phytopathol.: doi: 10.1111/jph.12108 (p. 3). 2013.
Basionym: Nimbya celosiae E.G. Simmons & Holcomb, Mycotaxon
55: 144. 1995.
≡ Alternaria celosiae (E.G. Simmons & Holcomb) D.P. Lawr., M.S. Park
& B.M. Pryor, Mycol. Progr. 11: 811. 2012. (nom. illegit., homonym of
Alternaria celosiae (Tassi) O. Savul. 1950).
Alternaria gomphrenae Togashi, Bull. Imp. Coll. Agric. 9: 6. 1926.
≡ Nimbya gomphrenae (Togashi) E.G. Simmons, Sydowia 41: 324. 1989.
Alternaria perpunctulata (E.G. Simmons) D.P. Lawr., M.S. Park &
B.M. Pryor, Mycol. Progr. 11: 811. 2012.
Basionym: Nimbya perpunctulata E.G. Simmons, Stud. Mycol. 50:
115. 2004.
Section Alternata D.P. Lawr., Gannibal, Peever & B.M.
Pryor, Mycologia 105: 538. 2013. Fig. 4.
Type species: Alternaria alternata (Fr.) Keissl.
Diagnosis: Section Alternata contains straight or curved primary
conidiophores, short to long, simple or branched, with one or several
apical conidiogenous loci. Conidia are obclavate, long ellipsoid, small
or moderate in size, septate, slightly constricted near some septa,
with few longitudinal septa, in moderately long to long, simple or
branched chains. The conidium body can narrow gradually into a
tapered beak or secondary conidiophore. Secondary conidiophores
can be formed apically or laterally with one or a few conidiogenous
loci.
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