Contribución al conocimiento del género Helvella (Ascomycota: Pezizales) en México: descripción de especies poco conocidas Contribution to the study of the genus Helvella (Ascomycota: Pezizales) in Mexico: description of poorly known species

Palabras clave: taxonomia, Helvella, distribucion, Mexico. Abstract. A taxonomic review of the specimens of the genus Helvella housed at FCME (UNAM) Herbarium was carried out; 14 species were determined. The knowledge of this genus in the states of Chihuahua, Distrito Federal, Estado de Mexico, Guanajuato, Guerrero, Michoacan, Nayarit, Oaxaca, Queretaro and Tlaxcala is widened. A sinoptical key is provided for the species cited from Mexico, as well as the morphological description of selected taxa.