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Geothallus
Conservation status
Critically Endangered  (IUCN 3.1)
Scientific classification
Kingdom:	Plantae
Division:	Marchantiophyta
Class:	Marchantiopsida
Order:	Sphaerocarpales
Family:	Sphaerocarpaceae
Genus:	Geothallus Campb.
Species:	G. tuberosus
Binomial name
Geothallus tuberosus Campb.

Geothallus is a monotypic genus of liverwort in the family Sphaerocarpaceae family. It includes only the single species Geothallus tuberosus. Its common name is Campbell's liverwort. It is endemic to California, where it is known only from San Diego and Riverside Counties.

This liverwort grows in moist coastal scrub habitat and vernal pools. At least one population occurs on the grounds of Marine Corps Base Camp Pendleton, and it has also been noted on the Santa Rosa Plateau.

References

1. ^ Doyle, W.T. (2012). "Geothallus tuberosus". IUCN Red List of Threatened Species. 2012: e.T39242A2895685. doi:10.2305/IUCN.UK.2012-1.RLTS.T39242A2895685.en. Retrieved 14 November 2021.
2. ^ Campbell, D. H. (1896). "A new Californian Liverwort". Botanical Gazette. 21: 9–13, pl. 2. doi:10.1086/327288.
3. ^ Geothallus tuberosus. CNPS, Rare Plant Program. 2015. Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society. Accessed 31 August 2015.

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• IUCN Red List critically endangered species
• Sphaerocarpales
• Liverwort genera
• Endemic flora of California
• Bryophyta of North America
• Natural history of the California chaparral and woodlands
• Natural history of Riverside County, California
• Natural history of San Diego County, California
• Natural history of the Peninsular Ranges
• Monotypic bryophyte genera
• Critically endangered flora of California
• Bryophyte stubs