Flavonoids from Onychium contiggum Flavonoids of Onuchium lucidum Gametophytic Development and Apogamy of the Fern Onychium siliculosum(Desv.) C. Chr. Phylogenetic Analysis of Onychium Based on Five Chloroplast DNA Sequences STUDIES ON THE SPORE MORPHOLOGY OF ONYCHIUM FROM CHINA Chemical consitituents from Onychium japonicum Gametophyte development in Onychium japonicum and its systematic significance