Taxon Report

Mobergia calculiformis (W.A. Weber) H. Mayrhofer & Sheard

light gray lichen

Print Report

Taxon Summary

Mobergia calculiformis, commonly known as light gray lichen, is a crustose lichen (saxicolous) in the Physciaceae that is found in California and elsewhere. It occurs within Coastal scrub, growing at elevations from 10 to 10 meters. Mobergia calculiformis is ranked 3, Plants About Which We Need More Information, A Review List.

Classification


Scientific Name:	Mobergia calculiformis (W.A. Weber) H. Mayrhofer & Sheard
Common Name:	light gray lichen
Family:	Physciaceae
Element Code:	NLT0018660
USDA Plants Symbol:	MOCA5
Synonyms/Other Names:

Ecology and Life History


Lifeform:	crustose lichen (saxicolous)
Blooming Period:
Elevation:	10-10 (35-35)
General Habitats:	Coastal scrub
Microhabitat:
Microhabitat Details:	On rocks

Conservation Status


CA Rare Plant Rank:	3
Global Rank:	G3
State Rank:	SH
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 3 on 2014-03-01

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
La Jolla (3211772), Point Loma (3211762)

Threat List Data from the CNDDB


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

Notes



Added to CRPR 3 based on prior inclusion in CNDDB; CALS Conservation Committee sponsorship is pending. See The Bryologist 95(4)436 (1992) 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 23 November 2025].