Abstract: Since 1980, the investigation on pathogenic microfungi was made trees and shrubs in diversely structured forests in northern slope of Changbai Mountain, including a few saprophytic, in 2100 samples gathered, 213 fungal species were identified belonging to 97 genera, 23 families, 13 orders of 6 classes. Among them, 7 new species have been reported. The distributions and compositions of the fungal species, and relations between major fungal diseases and natural conditions were discussed.

Key words: Changbai Mountain, Tree-microfungi, Species and composition