Calypogeia fissa, commonly known as Calypogeia fissa, is a liverwort species native to moist, shaded habitats across temperate regions, particularly in parts of Europe and North America. This plant typically grows in low, prostrate forms, reaching heights of only a few centimeters, and often forms dense mats on the forest floor or among mosses. Its notable characteristics include lobed, green leaves that are arranged in a rosette pattern, and it reproduces through both vegetative means and sporophytes, which are less commonly observed. The sporophytes are elongated and can be found emerging from the leafy thallus, producing spores that aid in its propagation.

Ecologically, Calypogeia fissa plays a significant role in nutrient cycling and soil formation, contributing to the overall health of forest ecosystems. It provides habitat and moisture retention for various microfauna and is an important component of the understory flora. While not widely utilized by humans, it can be of interest in ecological studies and conservation efforts due to its sensitivity to environmental changes. Adaptations such as its ability to thrive in low-light conditions and its resilience to fluctuating moisture levels make it a fascinating subject for research in plant ecology and adaptation strategies.