Liverwort shoot. Fluorescence light micrograph of the ventral side of a shoot of a Lepidozia reptans liverwort. This gametophyte stage is the dominant part of the life cycle of a liverwort, in contrast to the spore-producing stage. Hornworts, liverworts and mosses are non-vascular plants collectively known as bryophytes. This sample has been stained with berberine, which fluoresces under ultraviolet (UV) light. Magnification: x140 when printed at 10 centimetres across.