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Frullania (order Jungermanniales) A genus of leafy liverworts, which have a characteristic type of leaf. Each leaf consists of 2 parts, the smaller of which is pitcher-like; these tiny pitchers hold water and often contain a characteristic microscopic fauna, including rotifers, which may in some way aid in the nutrition of the liverwort. The thallus is often dark green to copper-brown or purplish in colour. F. dilatata and F. tamarisci are both common British species; F. tamarisci grows on rocks, on the ground, or less frequently on trees, while F. dilatata generally grows on trees.