the preliminary result of a survey conducted on xylaria species in the north of iran is presented. based on morphological examination of fungal specimens collected from guilan, mazandaran and golestan provinces, eight species including xylaria arbuscula, x. cubensis, x. filiformis, x. hypoxylon, x. longipes, x. multiplex, x. pannosa, and x. polymorpha were identified. among the identified speci...