Pharmacognostical Studies on the Chinese Drug Guanzhong Produced in Middle-South China A PRELIMINARY STUDY ON BIOMASS OF WOODWARDIA JAPONICA COMMUNITY UNDER A CONIFEROUS PLANTATION IN SUBTROPICAL CHINA Paleocene Wuyun flora in Northeast China: Woodwardia bureiensis, Dryopteris sp. and Osmunda sachalinensis Studies on the Allelopathy of the Maceration Extracts of Woodwardi japonica and Hicriopteris glauca Ultrastructure of the sporoderm development in Woodwardia japonica Pharmacognostical Studies on the Chinese Drug Guanzhong Produced in East China Studies on the Chemical Constituents of Woodwardia japonica In vitro Antibacterial Activities Extracts from Four Plants Used as Traditional Chinese Medicine Guanzhong