Liverworts are classified as bryophytes, and are distinguished from the other members of this order (mosses and hornworts) by having either flat-lobed leaf-stem structures or small leaves in rows of three. They can be found on tree trunks or growing on exposed soil, often in association with mosses. As such, they can become a troublesome weed in some horticultural situations (e.g., Lunularia cruciata).
An example of one such phytochemical is Marchantin A. This bis(bibenzyl) is commonly found in Marchantiales species such as Marchantia polymorpha and shows antifungal, antimicrobial and muscle relaxing and cytotoxic activities.