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Effect of grazing rate on biomass and element composition of Xanthoparmelia camtschadalis Contributions to the Lichen Flora of the Hengduan Mountains, China (6): Revisional Study of the Genus Canoparmelia (Lichenized Ascomycota, Parmeliacaea) CHEMICAL CONSTITUENTS FROM PARMELIA TINCTORUM STUDIES ON THE CHEMICAL CONSTITUENTS OF PARMELIA CIRRHATA FR. Element Composition of Nostoc commune and Xanthoparmelia camtschadalis under Grazing Pasture and Their Relations with Stocking Rates