Abstract
Marchantins A, B and C, three new cyclic bisbibenzyls with two ether links have been isolated from the liverworts Marchantia polymorpha, M. paleacea var. diptera and M. tosana (Marchantiales). Riccardia multifida (Metzgeriales) also contained two new cyclic bisbibenzyls, riccardins A and B, with an ether and a biphenyl link. The presence of cyclic bisbibenzyls has not been confirmed in Dumortiera hirsuta and Preissia quadrata (Marchantiales). The present chemical data support that D. hirsuta and P. quadrata are not closely allied to Marchantia by flavonoid chemistry and some species of Marchantiales have close affinities to those of Metzgeriales.
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