Taxon Report

Geothallus tuberosus Campb.

Campbell's liverwort

Print Report

Taxon Summary

Geothallus tuberosus, commonly known as Campbell's liverwort, is a ephemeral liverwort in the Sphaerocarpaceae that is found only in California. It occurs within Coastal scrub (mesic), and Vernal pools, growing at elevations from 10 to 600 meters. Geothallus tuberosus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Geothallus tuberosus Campb.
Common Name:	Campbell's liverwort
Family:	Sphaerocarpaceae
Element Code:	NBHEP1C010
USDA Plants Symbol:	GETU3
Synonyms/Other Names:

Ecology and Life History


Lifeform:	ephemeral liverwort
Blooming Period:
Elevation:	10-600 (35-1970)
General Habitats:	Coastal scrub, Vernal pools
Microhabitat:
Microhabitat Details:	soil

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	IUCN_CR
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	12
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	12

Location


California Endemic: True
California Counties and Islands: Name (Code)
Riverside (RIV), San Diego (SDG)
Quads: Name (Quad Code)
Del Mar (3211782), Fallbrook (3311743), La Jolla (3211772), National City (3211761), Point Loma (3211762), Poway (3211781), Wildomar (3311753)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	%

Notes



Most suitable historic habitat lost to urbanization. Need quads for RIV Co. Monotypic genus. See Botanical Gazette 21:13 (1896) for original description.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 29 October 2025].