Abstract: Survey was made on the VA mycorrhizal states of 256 pteridophtes species in the tropi- cal and subtropical areas of Yunnan. Twenty five species of VA mycorrhizal fungi were isolated and identified from the fern roots and rhizosphere soil of mycorrhized pteridophytes. The 25 spe- cies of fungi belong to the genera of Acaulospora, Gthespra, Glomus, Sclerocystis and Scutellospora respectly, among which, 8 species were new record of China. Concerning mycorrhizal states and their evolution of these pteridophytes was disussed, and the taxonomic characters of the 25 fungi species were described in this article.

Key words: VA mycorrhizal fungi