Revision of the genus Bulbothrix (Parmeliaceae, lichenized Ascomycota) in NE Argentina, with a key to the species

Eight species belonging to Bulbothrix Hale from NE Argentina were studied. Among them, Bulbothrix affixa (Hale & Kurok.) Hale is a new continental record, and five species, viz. B. cassa Jungbluth, Marcelli & Elix, B. coronata (Fée) Hale, B. isidiza (Nyl.) Hale, B. laeviuscula (Räsänen) Benatti & Marcelli, and B. tabacina (Mont. & Bosch) Hale, are new citations for the country. The specimens are described, commented, and illustrated. A key for species identification is also presented.