Rhizomnium nudum (E. Britton & R.S. Williams) T.J. Kop.:
Japan (Asia)
Canada (North America)
United States (North America)

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

Global Range: Amphiberingian distribution. Russian Far East, Japan, Alaska, British Columbia, Alberta, Washington, Idaho, Montana, Oregon. (Records from northern California reportedly based on misidentifications.)

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: > 300

Comments: Estimated more than 300 occurrences worldwide. The University of Alberta database has the most complete listing with 97 records, mostly from Alaska and British Columbia. The ISMS database has 190 records representing 127sites.

Canada

Rounded National Status Rank: N4 - Apparently Secure

United States

Rounded National Status Rank: NNR - Unranked

Rounded Global Status Rank: G4 - Apparently Secure

Reasons: Estimated more than 300 occurrences worldwide. Estimated 100 occurrences worldwide with good viability. Estimated 25,000 individuals worldwide. Estimated range 10,000 square miles worldwide (amphiberingian distribution). Estimated area of occupancy 100 acres worldwide. Long-term and short-term trends relatively stable. Slightly threatened worldwide. Estimated 40 sites protected worldwide. Moderately vulnerable. Narrow environmental specificity (moist but not wet substrates, somtimes along streams or by late-persisting snow beds).

Environmental Specificity: Narrow. Specialist or community with key requirements common.

Comments: Narrow environmental specificity. On moist but not wet organic soil, rocks, or rotten logs in damp shaded sites, sometimes along streams or by late-persisting snow beds.

Global Short Term Trend: Relatively stable (=10% change)

Comments: Short-term trend worldwide stable.

Global Long Term Trend: Increase of 10-25% to decline of 30%

Comments: Long-term trend worldwide relatively stable. There may be some declines near the southern end of its range where it is affected by logging.

Comments: Slightly threatened worldwide. Logging and trampling by hikers, horses and cows at stream crossings and watering holes could endanger some populations.