Abstract: A survey of ectomycorrhizal fungi was carried out under 7 chief forest types in alpine coniferous forests between altitudes from 3000 to 4000 m. in the northwestern part of Yunnan Province in Summers of 1985 and 1986 by use of method of observation in standard stands. During the 2 years, 26 stands were investigated, which were grouped into 7 forest types. Under these forests were also collected more than 500 higher fungal specimens, 140 ectomycorrhizal specimens and 20 soil samples. There are 33 genera about 140 species of ectomycorrhizal fungi listed under these 7 forest types. Their distribution shows a certain regularity, it varies with the tree species, soils and topographic factors, such as altitude, aspects, slope position and steepness of slopes. The common ectomycorrhizal fungi presenting in all the forest types are those of genera Amanita, Cortinarius, Russula, Lactarius, Laccaria, Cantharellus, Boletus and Suillus, but their species and abundance in the different forests may be different. this paper is also attached a list of ectomycorrhizal fungi and their distribution under these 7 forest types.

Key words: Alpine coniferous forests, Ectomycorrhizal fungi, Larix potaninii var. macrocarpa, Picea likiangensis, Pinus densata