Marasmiellus Paspali Var. Americanus, the Causal Agent of 'Borde Blanco' Disease of Maize in Latin America

The causal agent of borde blanco disease of maize in Central America is identified as a new variety of Marasmiellus paspali. Marasmiellus paspali var. americanus differs from var. paspali by paler coloration of the pileus, lamellae and stipe. Marasmiellus paspali var. paspali is found in India, Sri Lanka and from an intercept in New Guinea. A third variety in west Africa is distinguished by the near absence of lamellae. Marasmiellus paspali sensu lato is known to colonize Zea mays, Paspalum dilatatum and Pennisetum leonis.