Taxon Details

Riella americana

American riella

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Taxon Summary:

Riella americana, commonly known as American riella, is a liverwort (aquatic) in the Riellaceae that is found in California and elsewhere. It occurs within Lower montane coniferous forest, and Pinyon and juniper woodland, growing at elevations from 1615 to 1615 meters. Riella americana is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Riella americana M. Howe & Underw.
Common Name: American riella
Family:	Riellaceae
Element Code:	NBHEP31020
USDA Plants Symbol:	RIAM6
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G2G3
State Rank:	S1
Other Status:
CRPR Changes: added to 2.2 on 2011-03-23
Add Date:	2011-03-23
Date Edited:	2024-03-06

Ecology and Life History

Lifeform: liverwort (aquatic)

Blooming Period: Aug-Sep

Elevation:
1615 - 1615 meters
5300 - 5300 feet

General Habitats:

Lower montane coniferous forest
Pinyon and juniper woodland

Microhabitat Details: Arid and semiarid regions as a submerged aquatic in mud flats. In temporary pools and streams. Also in reservoirs and stock ponds.

Microhabitat:

Notes

Notes: Similar to R. affinis.
Threats:
Taxonomy:

Threat List Data from the CNDDB

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

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)
California (CA), New Mexico (NM), South Dakota (SD), Texas (TX)

California Counties and Islands: Name (Code)
Modoc (MOD)

Quads: Name (Quad Code)
Big Sage Reservoir (4112056), Mahogany Ridge (4112055)

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

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Status Review:	Proposed New Add to Rank 2.2, G2? / S1?
Species Account:	Riella americana profile for potential Species of Conservation Concern evaluation (2018)
Other:	USFS Potential Species of Conservation Concern Profile

CNPS Rare Plant Inventory