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liverwort
A member of a group of primitive prostrate plants growing in moist habitats and occasionally in water. Liverworts form the class Hepaticae of the division Bryophyta (see bryophyte), which also includes the mosses and hornwort. The most familiar types have a flat, lobed thallus attached to the ground by root-like rhizoids. Other types have a thallus bearing leaf-like expansions.
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