Taxon Report

Asplenium trichomanes L. ssp. trichomanes

maidenhair spleenwort

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Taxon Summary

Asplenium trichomanes ssp. trichomanes, commonly known as maidenhair spleenwort, is a perennial rhizomatous herb in the Aspleniaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, growing at elevations from 185 to 200 meters. Asplenium trichomanes ssp. trichomanes is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Asplenium trichomanes L. ssp. trichomanes
Common Name:	maidenhair spleenwort
Family:	Aspleniaceae
Element Code:	PPASP021K2
USDA Plants Symbol:	ASTRT
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: May-Jul	May-Jul
Elevation:	185-200 (605-655)
General Habitats:	Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.1
Global Rank:	G5T5
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.1 to 2B.1 on 2013-06-12 changed from 2.3 to 2.1 on 2012-10-31

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)
Del Norte (DNT)
Quads: Name (Quad Code)
Hiouchi (4112471)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Recreational use (non-ORV)	1	100%
Road/trail construction/maint.	1	100%

Notes



Known in CA only from near Hiouchi.
Threats:
Extirpated in ID.
Taxonomy:

Selected References

Asplenium trichomanes ssp. trichomanes profile for potential Species of Conservation Concern evaluation (2018)

Madroño 29(1):57 (1982) for first CA record

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 4 November 2025].