Abeywickrema, B.A.: The genera of Ceylon Pteridophytes (Ceyl. J. Sc. A. Bot. 13, 1956, 1-30). Keys & descr. – & M.D. Dassanayake: Crenidomonas bilabiatum (Nees & Bl.) Copel., a fern new to Ceylon from Ritigala (Ceyl. J. Sc. A. Bot. 13, 1956, 41-42, t. 2).