Adiciones al conocimiento de Xylaria (Ascomycota, Xylariales) en México

although several works have been published on xylaria in mexico, some states of the country have few records of this genus. the present work recorded 18 species of xylaria from 15 states, the species are: x. arbuscula, x. brevipes, x. corniculata, x. curta, x. enterogena, x. fockei, x. gracillima, x. guyanensis, x. hypoxylon, x. laevis, x. longipes, x. mellissi, x. microceras, x. multiplex, x.nigrescens, x. pallide-ostiolata, x. polymorpha and x. schwenitzii.