A mycological survey in four sectors from National Park Conguillío (IX Region - Chile) was performed. The material collection was done according to the presence of symptoms and signs on plants growing in each of the defined sector for collecting; the identification of the organisms related with every problem was performed by direct observations of morphological characteristics and when necessary, observations of related cultures. Every description contains the identity of the organism, information of the substrate where found, annotated ecological rol on the substrate and date of collection. All the information from the field is complemented with bibliographic comments.