Spermatocyte and Spermatozoid Ultra-structures of Dryopteris crassirhizoma Spore Germination of Dryopteris crassirhizoma(Dryopterydaceae) Correlative Study on Storage Time and Quality of Rhizoma Dryopteris Crassirhizomae Ultrastructure of Oogenesis in Dryopteris crassirhizoma Nakai Separation and purification of total poly phenol from Dryopteris crassirhizoma with anion exchange resin