521 Nova Hedwigia 88 3—4 521—530 Stuttgart, May 2009 DOI: 10.1127/0029-5035/2009/0088-0521 0029-5035/09/0088-0521 $ 2.00 © 2009 J. Cramer in der Gebrüder Borntraeger Verlagsbuchhandlung, D-14129 Berlin · D-70176 Stuttgart The family Diatrypaceae (Ascomycota) in Argentina: new species and new records by Cecilia C. Carmarán 1* , M. Belén Pildain 2 and Larissa N. Vasilyeva 3 1 PRHIDEB-CONICET, Departamento de Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales (UBA), Ciudad Universitaria, Pabellón II, 4to. Piso, CP1428EHA Buenos Aires, Argentina 2 Centro Forestal CIEFAP, C.C.14. 9200 Esquel, Chubut, Argentina 3 Institute of Biology & Soil Science, Far East Branch of the Russian Academy of Science, Vladivostok 690022, Russia With 16 figures and 1 table Carmarán, C.C., M.B. Pildain & L.N. Vasilyeva (2009): The family Diatrypaceae (Ascomycota) in Argentina: new species and new records. - Nova Hedwigia 88: 521–530. Abstract: Six diatrypaceous species occurring in Argentina are discussed in this paper. Three new species (Diatrype gigantospora, D. wrightii, Eutypa iguazensii) and a new variety (Eutypella corynostomoides var. argentinensis) are described and illustrated. To our knowledge, this is the first record of Diatrype costesi and Eutypa leptoplaca in this country. Key words: Argentina, Diatrypaceae, Eutypa leptoplaca, taxonomy. Introduction The family Diatrypaceae was established by Nitschke in 1867. Since then, several authors have reviewed both the family and the generic concepts (Tiffany & Gilman, 1965; Glawe & Rogers, 1984; Rappaz, 1987; Vasilyeva & Stephenson, 2004, 2005; Carmarán et al., 2006). Spegazzini (1898, 1910, 1925) began to study the biodiversity of the Diatrypaceae in Argentina and described 31 species and several varieties. In recent years, the knowledge of diatrypaceous fungi in this country has increased substantially (Carmarán & Romero, 1991; Carmarán, 2002; Romero & Carmarán, 2003; Pildain et al., 2005; Carmarán et al., 2006). *corresponding author