Three new bibenzyl derivatives were isolated from the Australian liverwort Frullania falciloba and their structures were established to be 3,4-methylenedioxy-3′-methoxybibenzyl, 3-hydroxy-4,3′-dimethoxybibenzyl and 3-[4′-methoxybenzyl]-5,6-dimethoxyphthalide by spectral methods and synthesis. The present species belongs to the bibenzyl-type, Chemotype III, in the Frullaniaceae.