Taxon Report

Platismatia lacunosa (Ach.) W. L. Culb. & C. F. Culb.

crinkled rag lichen

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Taxon Summary

Platismatia lacunosa, commonly known as crinkled rag lichen, is a foliose lichen (epiphytic) in the Parmeliaceae that is found in California and elsewhere. It occurs within North Coast coniferous forest, and Riparian woodland, growing at elevations from 20 to 2000 meters. Platismatia lacunosa is ranked 2B.3, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Platismatia lacunosa (Ach.) W. L. Culb. & C. F. Culb.
Common Name:	crinkled rag lichen
Family:	Parmeliaceae
Element Code:	NLLEC2Q010
USDA Plants Symbol:	PLLA6
Synonyms/Other Names:

Ecology and Life History


Lifeform:	foliose lichen (epiphytic)
Blooming Period:
Elevation:	20-2000 (65-6560)
General Habitats:	North Coast coniferous forest, Riparian woodland
Microhabitat:
Microhabitat Details:	Usually growing on Alnus

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 2022-09-28

Occurrence Data from the CNDDB


Total Occurrences:	4
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	4

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM)
Quads: Name (Quad Code)
Blue Creek Mtn. (4112347), Fern Canyon (4112441), Iaqua Buttes (4012368), Lonesome Ridge (4112346), Owl Creek (4012358), Requa (4112451)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	25 %
Other	1	25%

Notes




Threats:
Habitat disturbance, frequent wildfires.
Taxonomy:

Selected References

Proposed Addition to California Rare Plant Rank 2B.3, G4 / S1

Methododus qua Omnes Detectos Lichenes (1803)

Contributions from the United States National Herbarium 34: 449–558

Species Fact Sheet for Survey and Manage Species: Platismatia lacunosa. Bureau of Land Management and USDA Forest Service.

USFS Potential Species of Conservation Concern Profile

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].