Abstract:
Tanah Putih Subdistrict Rokan Hilir Regency is one of the fern distribution area in Riau
Province. The purpose of this study was to compare the morphological characteristics of
three fern species belonged to Lygodiaceae family, that had been collected from Tanah
Putih Rokan Hilir Regency of Riau Province. The species used in this study were
Lygodium circinatum, Lygodium microphyllum, and Lygodium salicifolium. The
observation of morphological character showed that Lygodium species could be
distinguished based on the leaf and sporangia character. L. cicrcintum has elongated
pinnae arranged in a circular position. L. microphyllum was characterized by having
small leaf with rounded tip, had rounded triangle pinnae. While L. salicifolium had
pinnae arranged in an alternate position, with an elongated cluster of sporangia
