Abstract: The surface ornamentation of sporoderm has been studied under SEM in 21 species of 9 genera of Sinopteridaceae. Sporoderm ornamentation is a stable genetic character. The characters of the ornamentation of genera vary remarkbly. Thus, the palynological evidence for the taxonomy of the family may be provided. These types are in keeping with the sections which are divided morphologically by Wu Shiew-hung and Ching Ren chang (1991). We provide useful and palynological data for Leptolepidium Hsing et S. K. Wu. The paper also discusses the phylogenetic tree of Sinopteridaceae.

Key words: Spore morphology