内生菌根普通存在于自然界中。Meyer(1973)估计,有外生菌根的只占3％,而绝大多数的显花植物都有内生菌根。与国民经济有重要关系的栽培植物,除十字花科和黎科植物外,都有内生菌根。Hayman(1978)预言未来的十年,内生菌根的研究将会有一个突飞猛进的发展。Satyanarayana(1979)发现,茶树根系中也有丛枝状内生菌根存在,这是茶树栽培业中的新发现。近年来,我国的严学成等对茶树根的显微观察中,也先后观察到 Endomycorrhizae commonly exist in nature. Meyer (1973) estimates that there are only 3% of ectomycorrhizae, and most of the flowering plants have endogenous mycorrhizae. Cultivated plants that have an important relationship with the national economy have endomycorrhizae except for the crucifer and the legumes. Hayman (1978) predicted that in the coming ten years, the research of endomycorrhiza will have a rapid development. Satyanarayana (1979) found that there are also arbuscular mycorrhizal roots in the root system of tea trees, which is a new discovery in tea plantation industry. In recent years, China’s Yan Xuecheng and other microscopic observations of the roots of tea, has also observed