Effects of arsenic and calcium on metal accumulation and translocation in Pteris vittata L. New Record of Pteris vittata L. From Jiangsu Province and a Tentative Analysis of Its Dispersal Mechanism Effects of harvesting on As accumulation and removal efficiency of As by Chinese brake (Pteris vittata L.) Phosphorus availability in soil-Pteris vittata L. system affected by arsenic Ultrastructure and subcellular distributions of arsenic and calcium in Pteris vittata L.