Taxon Details

Thamnolia vermicularis

whiteworm lichen

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Taxon Summary:

Thamnolia vermicularis, commonly known as whiteworm lichen, is a fruticose lichen (terricolous) in the Icmadophilaceae that is found in California and elsewhere. It occurs within Chaparral, and Valley and foothill grassland, growing at elevations from 90 to 90 meters. Thamnolia vermicularis is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

Classification

Scientific Name: Thamnolia vermicularis (Swartz) Ach. ex Schaerer
Common Name: whiteworm lichen
Family:	Icmadophilaceae
Element Code:	NLTES43860
USDA Plants Symbol:	THVE60
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.1
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S1
Other Status:
CRPR Changes:
Add Date:	2014-03-01
Date Edited:	2022-06-08

Ecology and Life History

Lifeform: fruticose lichen (terricolous)

Blooming Period:

Elevation:
90 - 90 meters
295 - 295 feet

General Habitats:

Chaparral
Valley and foothill grassland

Microhabitat Details: On rocks derived from sandstone

Microhabitat:

Rocky
Sandstone

Notes

Notes: Known in CA only from near Dillon Beach. Preferred habitat may exist on Mt. Shasta; needs field surveys. Possibly threatened by trampling and foot traffic. See Bulletin of the California Lichen Society 16(2):21-26 (2009) for CALS Conservation Committee sponsorship.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	1	100 %
Agriculture	1	100%
Development	1	100%
Foot traffic/trampling	1	100%
Road/trail construction/maint.	1	100%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					1
A	B	C	D	X	U
0	0	0	0	0	1

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	1

Presence:
Presumed Extant	1
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Alaska (AK), California (CA), Colorado (CO), Connecticut (CT), Idaho (ID), Montana (MT), New Hampshire (NH), New York (NY), Oregon (OR), Vermont (VT), Washington (WA), Wyoming (WY)

California Counties and Islands: Name (Code)
Marin (MRN)

Quads: Name (Quad Code)
Tomales (3812228), Valley Ford (3812238)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory