Asterella californica (California asterella)

Asterella californica is a complex thallic liverwort in the phylum Marchantiophyta. A. california often grows as colonies of flat rosettes of light green, rigid thalli, with undersides dark wine-red to nearly black. The receptacles are rounded, with four lobes each bearing a single sporangium sheathed by a white tattered skirt. A. california is dioecious with separate male plants often intermingled with female plants. This species is found throughout California from San Francisco southward to San Diego…

— Wikipedia