Comparative Morphology of Development of the Gametophyte and Juvenile Sporophyte of Phymatopteris A new flavanol glycoside from Phymatopteris hastata with effect on glucose metabolism Ecological significance of leaf appendage in the fern genus Phymatopteris Pichi Serm.(Polypodiaceae) Taxonomic significance of scale characteristics in the fern genus Phymatopteris(Polypodiaceae) Chemical constituents from Phymatopteris hastate Comparative Morphology of Leaf Epidermis in the Fern Genus Phymatopteris (Polypodiaceae)