Aureobasidium Viala & G. Boyer, Rev. gén. Bot. 3: 371 (1891).
Aureobasis Clem. & Shear, Gen. fung., Edn 2 (Minneapolis): 343, 381 (1931)
Dematoidium Stautz, Phytopath. Z. 3: 204 (1931)
Pachybasidiella Bubák & Syd., Annls mycol. 13(1): 9 (1915)
Polyspora Laff., Scientific Proc. R. Dublin Soc., N.S. 16: 258 (1921) [1920-22]
Protocoronis Clem. & Shear, Gen. fung., Edn 2 (Minneapolis): 197, 344 (1931)
Protocoronospora G.F. Atk. & Edgerton, J. Mycol. 13(5): 185 (1907)
Pullularia Berkhout, De Schimmelgeslachten Monilia: 55, 64 (1923)
Parasitic or saprobic on plants, fruits and causes human skin diseases. Some plant pathogens form Kabatiella synanamorphs which cause leaf spots. They form sub circular irregular, amphigenous, necrotic, sunken, pale to medium brown leaf spots with a raised, dark brown margin. Stromata present or absent, visible in sub-stomatal cavity, hyaline or lightly pigmented, dark brown with globose to broadly ellipsoidal, round or elongated pseudo-parenchymatous cells when present. Colonies spreading, smooth, often covered with slimy masses of conidia, usually with sparse aerial mycelium; light brown, yellow, pink or black. Hyphae with cells commonly wider than long, hyaline, frequently soon becoming brown and thick-walled sometimes thin, smooth, transversely septate. Asexual state: Conidiomata acervular to sporodochial, amphigenous, substomatal, subepidermal, pulvinate, dry or crystaline in appearance, pale brown, discrete. Conidiogenous cells on hyaline hyphae, lateral, terminal or intercalary, cylindrical, clavate or globose, integrated, terminal, with holoblastic, polyblastic conidiogenesis, with numerous synchronously produced conidia. Conidia blastic, hyaline to dark brown, smooth-walled, aseptate, straight, ellipsoidal to spherical, reniform to sickle-shaped, sometimes cylindrical with obtuse ends and occasionally with a slightly truncate base, rather variable in shape and size. Secondary conidia common; endoconidia often present. Occasionally dark, one or two-celled arthroconidia are formed. Hyaline conidia one-celled, smooth, ellipsoidal, very variable in shape and size often with an indistinct hilum. Dark brown conidia 1–2 celled, two celled slightly constricted at septum. (Hermanides-Nijhof 1977; Zalar at al 2008). Sexual state: See notes.
Notes: Aureobasidium was introduced by Viala and Boyer (1891) and Aureobasidium vitis assigned as the type specimen. Thereafter a number of species were introduced by various authors and several Kabatiella species were also transferred to Aureobasidium considering morphological characters and ability to form leaf spots on a restricted host range (Hermanides-Nijhof 1977). The type specimen Aureobasidium vitis has not been preserved. De Bary (1884) introduced Dematium pullulans and Arnaud (1910) suggested that Dematium pullulans and Aureobasidium vitis are the same. Then Hermanides-Nijhof (1977) described A. pullulans as the oldest name for the type species of Aureobasidium designating CBS 584.75 as a ex-neotype strain (Zalar at al 2008). In this paper, we introduce a new family Aureobasidiaceae in order to accommodate species in the second major clade (Aureobasidiaceae) of our phylogenetic tree. The Aureobasidium clade consist of two putative strains of Discosphaerina (Columnosphaeria) fagi (CBS 171.93), Selenophoma mahoniae (CBS 388.92) and the ex-type strain of Kabatiella lini (CBS 125.21) in addition to Aureobasidium species. They might be considered to belong in Aureobasidium, but we retain Columnosphaeria fagi and Selenophoma mahoniae in related genera until the type specimens of Columnosphaeria and Selenophoma are collect and sequenced.
Type species: Aureobasidium pullulans (de Bary) G. Arnaud var. pullulans – Annales École Nat. Agric. Montpellier 16: 39, 1918.