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Riella is a genus in the liverwort family Riellaceae, and includes about eighteen species. Plants in the genus are small and grow submerged in shallow temporary pools. Although the genus is widely distributed in the Northern Hemisphere, locating populations is often difficult. Its occurrence is sporadic and local, and the tiny plants are ephemeral. The ornamented spores remain viable for several years, allowing the plants to survive annual drying of their habitat. The plants are easily grown in laboratory cultures.
Although found nearly worldwide, Riella populations are sporadic and limited to only a few known localities. The plants are never common, and are found most often in places where the summer is dry and the winter is wet and mild.
Text excerpted from the Wikipedia article Riella by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
