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Geothallus is a monotypic genus of liverwort in the family Sphaerocarpaceae. Its sole species, Geothallus tuberosus, is a critically endangered species endemic to California in the United States. Described in 1896 by American botanist Douglas Houghton Campbell, it is commonly known as Campbell's liverwort.
Endemic to California in the United States, Geothallus tuberosus is known only from San Diego County and Riverside County. It can be found in small, isolated populations on mesas, coastal hills, and the Peninsular Ranges, where it grows in sandy or gravelly soil, at the edges of vernal pools, and on flat and gently sloping areas in and near chaparral. It requires semi-shaded, moist conditions, and is considered very rare within its range.
Text excerpted from the Wikipedia article Geothallus by its contributors, under CC BY-SA 4.0; the excerpts are shared under the same licence.
