The various ways in which gemmae and gemmalings of Radula flaccida Lindenb. & Gottsche react to leachates and extracts from leaves of phorophytes have been studied. Leachates and extracts were found to affect extension growth of shoots of gemmaling, their leaf-size and production of rhizoids, but they do not affect initiation of growth from gemmae. The effect of the leachates and extracts on the establishment and later growth of the epiphyllous liverwort was found to be a function of the phorophyte leaf involved. The important role of leachates in the successful establishment and later growth of epiphyllous bryophytes, especially in the tropics where there is abundant annual rainfall, was discussed.