Taxon Report

Jaffueliobryum raui (Austin) Thériot

Rau's jaffueliobryum moss

Print Report

Taxon Summary

Jaffueliobryum raui, commonly known as Rau's jaffueliobryum moss, is a moss in the Grimmiaceae that is found in California and elsewhere. It occurs within Alpine dwarf scrub, Chaparral, Mojavean desert scrub, and Sonoran desert scrub, growing at elevations from 490 to 2100 meters. Jaffueliobryum raui is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Jaffueliobryum raui (Austin) Thériot
Common Name:	Rau's jaffueliobryum moss
Family:	Grimmiaceae
Element Code:	NBMUS97010
USDA Plants Symbol:	JARA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	moss
Blooming Period:
Elevation:	490-2100 (1610-6890)
General Habitats:	Alpine dwarf scrub, Chaparral, Mojavean desert scrub, Sonoran desert scrub
Microhabitat:	Carbonate, Dry, Openings, Rock crevices
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.3
Global Rank:	G4
State Rank:	S2
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 2B.3 on 2014-05-15

Occurrence Data from the CNDDB


Total Occurrences:	7
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	6

Location


California Endemic: False
California Counties and Islands: Name (Code)
Inyo (INY), Mendocino (MEN), Riverside (RIV), San Bernardino (SBD), Tehama (TEH)
Quads: Name (Quad Code)
Butterfly Peak (3311655), Clark Lake NE (3311643), Greenwater Canyon (3611625), Horn Spring (3411427), Indian Cove (3411612), Martinez Mtn. (3311653), Mendocino Pass (3912278), Savahia Peak SW (3411436), Vidal Nw (3411426)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	14 %
ORV activity	1	14%
Road/trail construction/maint.	1	14%

Notes



Discovered in California by J. A. Harpel in 1980.
Threats:
Potentially threatened by vehicles. Possibly threatened by road or trail construction and maintenance, and mining.
Taxonomy:
Similar to J. wrightii.

Selected References

Proposed Addition to California Rare Plant Rank 2B.3, G4? / S2?

Memoirs of the New York Botanical Garden 45:691-708 (1987)

Jaffueliobryum raui profile for potential Species of Conservation Concern evaluation (2018)

Madroño 46(4):215 (1999) [CA Discovery Information]

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 30 October 2025].