Two new varieties, Annulohypoxylon moriforme var. macrosporum and Hypoxylon investiens var. magnisporum are proposed; Annulohypoxylon nitens, Hypoxylon crocopeplum, H. subrutilum and H. rubiginosum var. microsporum are described as new records from Argentina. A dichotomous key to hypoxyloid taxa so far known from Argentina is presented.