外生菌根菌是与植物共生的真菌,多数是以担子菌为主的高等真菌,主要与松科、壳斗科、桦木科和杨柳科等树木的营养根,在土中形成二叉状或珊瑚状的共生体。由于外生菌根菌在林木生长上的重要性,以及由它形成的子实体大部分乃是美味可口的.因此,七十年代后期国内外对外生菌根菌的研究已从实验室的描述进入到田间应用试验。如美国乔治亚州的菌根研究与开发研究所,自1977年～1980年在美国和加拿大进行了大规模接种菌根制剂促进苗木生长的试验。并选用分布广、生长快、广寄主的彩色豆马勃(Pisolithus tinctorius)菌种为材料,以(石至) Ectomycorrhizal fungi and plant symbiosis fungi, most of which are basidiomycete-based higher fungi, mainly with Pinaceae, Fagaceae, Betulaceae and willow families and other trees of the nutrient root in the soil to form a binary Or coral-like symbiont. Because of the importance of ectomycorrhizal fungi in the growth of trees and the majority of the fruiting bodies formed by them, the researches on ectomycorrhizal fungi at home and abroad in the late seventies have been described in the laboratory Into the field application test. For example, mycorrhizal research and development institute in Georgia, USA, conducted experiments on large-scale inoculation of mycorrhiza to promote seedling growth in the United States and Canada from 1977 to 1980. And use widely distributed, fast growing, wide host color of Pisolithus tinctorius species as material, with (Shi to)