Geothallus

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.[2]

Geothallus tuberosus
Conservation status
Critically Endangered  (IUCN 3.1)
Scientific classification
Kingdom:	Plantae
Division:	Marchantiophyta
Class:	Marchantiopsida
Order:	Sphaerocarpales
Family:	Sphaerocarpaceae
Genus:	Geothallus Campb.[1]
Species:	G. tuberosus
Binomial name
Geothallus tuberosus Campb.[1]

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,[2] and it has also been noted on the Santa Rosa Plateau.[3]

References

1. Campbell, D. H. (1896). "A new Californian Liverwort". Botanical Gazette. 21: 9–13, pl. 2. doi:10.1086/327288.
2. 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.
3. Doyle, W.T. 2012. Geothallus tuberosus. The IUCN Red List of Threatened Species. Version 2015.2. Downloaded on 31 August 2015.