Taxon Report

Discelium nudum (Dicks.) Brid.

naked flag moss

Print Report

Taxon Summary

Discelium nudum, commonly known as naked flag moss, is a ephemeral moss in the Disceliaceae that is found in California and elsewhere. It occurs within Coastal bluff scrub (clay banks, and soil), growing at elevations from 10 to 50 meters. Discelium nudum is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Discelium nudum (Dicks.) Brid.
Common Name:	naked flag moss
Family:	Disceliaceae
Element Code:	NBMUS2E010
USDA Plants Symbol:	DINU5
Synonyms/Other Names:

Ecology and Life History


Lifeform:	ephemeral moss
Blooming Period:
Elevation:	10-50 (35-165)
General Habitats:	Coastal bluff scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.2
Global Rank:	G4G5
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.2 to 2B.2 on 2013-06-12

Occurrence Data from the CNDDB


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

Location


California Endemic: False
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM)
Quads: Name (Quad Code)
Requa (4112451), Trinidad (4112412)

Threat List Data from the CNDDB


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

Notes



Very rare throughout its range in the Northern Hemisphere. See Pl. Crypt. Brit. Fasc. 4:7-10 (1801) for original description, and Bryol. Univ. 1:366 (1826) for revised nomenclature.
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 17 November 2025].