Abstract:

Cross section of Usneaantarctica Du Rietz, Usnea aurantiaco atra (Jacq.)Bory. and Cladonia sp. at upper, middle and base position were done. The element composition and relative content were determined by SEM and EDS at surface, intermediate and inner layer in each position. The result is that the composition of element is similar same in this three kinds of lichen. The relative content of Al,Si,K and Ca elements are high,and the relative content of P is close at each position.The relative content of every element is different at different position and different layer of lichens. The result is benefit to study the stucture and physiological characteristics of lichens, and to analyze geological environment in Antarctica.