Pleosporales » Pleosporaceae » Alternaria

Alternaria ethzedia

Alternaria ethzedia E.G. Simmons, Mycotaxon 25(1): 300 (1986)

Lewia ethzedia E.G. Simmons, Mycotaxon 25(1): 299 (1986)

Index Fungorum number: IF 103982; Facesofungi number: FoF 00918

            Saprobic on dead stem. Sexual morph: Ascomata 96–162 μm high × 138–226 μm diam. (x̄ = 131×193 μm, n = 10), scattered to clustered, semi-immersed to erumpent, dark brown to black, globose to subglobose, coriaceous, ostiolate. Ostiole central, papillate. Peridium 20–38 μm (x̄ = 26.8 μm, n = 10) wide, comprising 3–5 layers of light to dark brown thick-walled cells of textura angularis. Hamathecium of 1.5–3 μm wide, cellular, septate pseudoparaphyses, anastomosing between and above asci. Asci 73–90 × 11.5–13.5 μm (x̄ = 82 × 1 2.5 μm , n = 20), (4 –6 –)8-spored, bitunicate, fissitunicate, cylindrical to subcylindrical, straight or somewhat curved, with a short pedicel, apically rounded, with a minute ocular chamber. Ascospores 15.5–20 × 7–8.5 μm (x̄ = 18 × 7.8 μm, n = 30), overlapping uni to biseriate, pale brown, ellipsoid to fusoid, muriform, initially with 3 transverse septa, become 4–5 at maturity, central 4 rows with a single longitudinal septum, constricted at the central septum, slightly constricted at the other septa, smooth-walled, surrounded by a mucilaginous sheath . Asexual morph: see asexual morph description in Simmons (1986).

Material examined: ITALY, Forlì-Cesena Province, Fiumicello di Premilcuore, on dead stem of Brassica nigra (Brassicaceae), 13 January 2013, Erio Camporesi IT 1007 (MFLU 15-1411), ex-type living culture, MFLUCC 13-0404, CFTCC.

GenBank Numbers: LSU: KT281914, SSU: KT281916, ITS: KT281913, RPB2: KT281915.

Notes: Alternaria was introduced by Nees (1816) and is a ubiquitous genus that comprises saprobic, endophytic and pathogenic species, associated with a wide variety of substrates (Woudenberg et al. 2013, Ariyawansa et al. 2015). Alternaria ethzedia was introduced by Simmons (1986) and named as the sexual morph Lewia ethzedia.

 

Figure x. Alternaria ethzedia (MFLU 15-1411) a, b Appearance of ascomata on the host surfaces. c, d Sections through ascomata. e Ostiole f Pseudoparaphyses. g–j Bitunicate asci. k–n Ascospores. Scale bars: c–e=50 μm, f=10 μm, g–j=25 μm, k–n=10 μm.

 

References:

 

Ariyawansa HA, Hyde KD, Jayasiri SC, Buyck B et al. 2015 Fungal diversity notes 111252-taxonomic and phylogenetic contributions to fungal taxa. Fungal diversity: an international journal of mycology 75, 274.

Nees of Esenbeck CG 1816 Ichneumonides Adsciti, Nature of Research in Genera et Familias Divisi: magazine Society friends to Berlin. 7, 243–277.

Woudenberg JHC, Groenewald JZ, Binder M, Crous PW 2013 Alternaria redefined. Studies in Mycology 75, 171–212.

 

Last update: 03 Feb 2021

 

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