Taxon Report

Hypogymnia schizidiata McCune

island tube lichen

Print Report

Taxon Summary

Hypogymnia schizidiata, commonly known as island tube lichen, is a foliose lichen in the Parmeliaceae that is found in California and elsewhere. It occurs within Chaparral, and Closed-cone coniferous forest, growing at elevations from 360 to 405 meters. Hypogymnia schizidiata is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Hypogymnia schizidiata McCune
Common Name:	island tube lichen
Family:	Parmeliaceae
Element Code:	NLT0032640
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	foliose lichen
Blooming Period:
Elevation:	360-405 (1180-1330)
General Habitats:	Chaparral, Closed-cone coniferous forest
Microhabitat:
Microhabitat Details:	On bark and wood of hardwoods and conifers

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G2G3
State Rank:	S2
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 1B.3 on 2014-03-01

Occurrence Data from the CNDDB


Total Occurrences:	10
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	0
Fair (C)	1
Poor (D)	0
None (X)	2
Unknown (U)	5

Location


California Endemic: False
California Counties and Islands: Name (Code)
Marin (MRN), Mendocino (MEN), San Mateo (SMT), Santa Barbara (SBA)
Quads: Name (Quad Code)
Drakes Bay (3812218), Inverness (3812217), Montara Mountain (3712254), Point Arena (3812386), San Francisco North (3712274), Santa Cruz Island B (3311986), Santa Rosa Island North (3312081), Santa Rosa Island South (3312071)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	3	30 %
Improper burning regime	3	30%

Notes



Often occurs on Juniperus, Pinus, Quercus, and Simmondsia. See Bulletin of the California Lichen Society 13(2):42-44 (2006) for CALS Conservation Committee sponsorship.
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 5 November 2025].