A novel linear dihydrodichromene derivative, metacalypogin, was identified from the Taiwanese liverwort Metacalypogeia alternifolia. Together with data from M. cordifolia, the chemical marker of the genus Metacalypogeia is obvious chroman derivatives, which is far different from that of Calypogeia, the other genus in the same family. In addition, two isomeric diterpenoids of cembrane‐type were identified from the Chinese liverwort Chandonanthus hirtellus. The relative stereostructures of the latter two isomers were proved by X‐ray crystallography. Both compounds were unstable in chloroform solution and further oxidized to the corresponding peroxy hemiacetal derivatives.

Two new oxygenated diterpenes, fusicoccanin and neofusicoccantriepoxide, were isolated and identified from the Taiwanese liver wort Plagiochila peculiaris. The latter compound possesses a methyl‐rearranged fusicoccane skeleton. In addition, known secoaromadendranes and macrocyclic chloro‐bisbibenzyls were also isolated from the polar fraction. P. peculiaris rep resents a very complex chemo‐type of this genus.