• Proposed
  • Under Assessment
  • ENPreliminary Assessed
  • 4Assessed
  • 5Published

Rhizoplaca idahoensis Rosentr. & McCune

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Scientific name
Rhizoplaca idahoensis
Author
Rosentr. & McCune
Common names
 
IUCN Specialist Group
Lichens
Kingdom
Fungi
Phylum
Ascomycota
Class
Lecanoromycetes
Order
Lecanorales
Family
Lecanoraceae
Assessment status
Preliminary Assessed
Preliminary Category
EN B1ab(iii,v)+2ab(iii,v)
Proposed by
Jessica Allen
Assessors
Jason Hollinger, Roger Rosentreter
Comments etc.
Jessica Allen

Assessment Notes

Justification

Restricted to EOO 649km2, AOO 48km2, 2 locations, and ongoing decline in quality of habitat and total number of individuals.


Taxonomic notes

Steve Leavitt et al. (2019) confirmed species status.


Why suggested for a Global Red List Assessment?


Geographic range

Restricted to two valleys in eastern Idaho.
EOO = 649 km2
Area of Occupancy = 48 km2


Population and Trends

Can be very locally abundant, with subpopulation sizes in the thousands. But subpopulations are very isolated.  Subpopulations have probably been fragmented by sheep grazing and road construction.  Probably over 20 subpopulations. Only two locations if sheep grazing can affect an entire valley.

Population Trend: Decreasing


Habitat and Ecology

Deep gravel calcareous alluvium basins and benches between 2100 and 2400 m.

Boreal Shrubland

Threats

The main threat is from sheep grazing.  Cattle apparently do not impact this species. Road construction fragments subpopulations because these vagrant lichens tend to be trapped by and accumulate into road ditches which are unfavorable microsites. Some invasive species may tend to exclude this lichen.

Agro-industry farmingRoads & railroads

Conservation Actions

This species is state listed in Idaho as S2.  Is there a way to mitigate the obstruction of gravel roads in the area?

Site/area protectionInvasive/problematic species control

Research needed

More on the ground surveys to locate possible additional locations (e.g. other valleys with similar geology).  Monitoring projects to quantify the rate of decline in population sizes.

Population size, distribution & trendsArea-based Management PlanPopulation trends

Use and Trade

There are no known commercial uses of this lichen.


Bibliography


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted