Hladki, A. I. & A. I. Romero. 2009. Novelties for the genera Annulohypoxylon and Hypoxylon (Ascomy- cota, Xylariaceae) from Argentina. Darwiniana 47(2): 278-288. 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.