The previously known cyclic bis(bibenzyls), marchantin C and H, and riccardin C have been isolated from the South African liverwort Marchantia polymorpha, together with two sesquiterpenoids, (-)-cuparene and (-)-2 hydroxycuparene, and p-hydroxybenzaldehyde, This is the first report of the isolation of marchantin H from Marchantia species. The South African species differs chemically from the Japanese, Indian French and German species.