Alternaria Nees, Syst. Pilze (Würzburg): 72 (1816) [1816-17], Index Fungorum number: IF7106

Pathogenic or saprobic on wood and dead herbaceous stems or leaves. Sexual morph: Ascomata small, solitary to clustered, erumpent to (nearly) superficial at maturity, globose to ovoid, dark brown, smooth, apically papillate, ostiolate. Ostiole papilla short, blunt. Peridium thin. Hamathecium of cellular pseudoparaphyses. Asci (4–6–) 8-spored, bitunicate, fissitunicate, cylindrical to cylindro-clavate, straight or somewhat curved, with a short, furcate pedicel and minute ocular chamber. Ascospores ellipsoid to fusoid, slightly constricted at septa, muriform, yellow-brown, without guttules, smooth-walled. Asexual morph: Stroma rarely formed, setae and hyphopodia absent. Conidiophores macronematous, mononematous, simple or irregularly and loosely branched, pale brown or brown, solitary or in fascicles. Conidiogenous cells integrated, terminal becoming intercalary, polytretic, sympodial, or sometimes monotretic, cicatrized. Conidia catenate or solitary, dry, ovoid, obovoid, cylindrical, narrowly ellipsoid or obclavate, beaked or non-beaked, pale or medium olivaceous-brown to brown, smooth or verrucose, with transverse and with or without oblique or longitudinal septa (Woudenberg et al. 2013).

Type species: Alternaria alternata (Fr.) Keissl., Beih. bot. Zbl., Abt. 2 29: 434 (1912)