Pekanbaru City is one of the epiphytic ferns distribution areas. This study aims to determine the diversity of epiphytic ferns in Pekanbaru, Riau based on the morphology of the stomata. All samples from the field were collected by exploration method. Morphological data were scaled and analyzed using NTSys PC 2.02i. A total of 20 species of epiphytic ferns (11 genera and 7 families) were identif…