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ASSESSMENT JUSTIFICATION [criteria: B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v)]

Idaho Grouse Pellet (Rhizoplaca idahoensis) is narrowly endemic to the Little Lost River and Birch Creek Valleys in Idaho, United States of America. Its total area of occupancy is 48 km², and its extent of occurrence is 996 km². It grows over deep gravel calcareous alluvium soils and remains unattached to any substrates. The most serious threats to this species are sheep grazing, which reduces the population size and area of occupancy, and road building, which fragments subpopulations and reduces the population size (Rosentreter 1997). Both threats have reduced the extent and quality of habitat for the species over the past decade and are expected to continue to do so. Thus, R. idahoensis is Endangered B1ab(ii,iii,iv,v)+2ab(ii,iii,iv,v).

Assessor/s: Root, H., Rosentreter, R. & Hollinger, J.; Reviewer/s: Allen, J.

Bibliography:

IUCN (2021) The IUCN Red List of Threatened Species. Version 2021-2. Available at: www.iucnredlist.org. (Accessed: 04 September 2021).

Leavitt, S.D., Kueller, R., Newberry, C.C., Rosentreter, R. & St. Clair, L. (2019) Shotgun sequencing decades-old lichen specimens to resolve phylogenomic placement of type material. Plant and Fungal Systematics 6(2): 237-247.

McCune, B. & Rosentreter, R. (2007) Biotic Soil Crust Lichens of the Columbia Basin. Northwest
Lichenologists, Corvallis.

Rosentreter, R. (1993) Vagrant lichens in North America. The Bryologist 96(3): 333-338.

Rosentreter, R. (1997) Conservation and management of vagrant lichens in the northern Great Basin, USA. In: Kaye, T.N., Liston, A., Love, R.M., Luoma, D.L., Meinke, R.J. & Wilson, M.V. (eds) Conservation and Management of Native Plants and Fungi, pp. 242-248. Native Plant Society of Oregon, Corvallis.

Rosentreter, R., & McCune, B. (1992) Vagrant Dermatocarpon in western North America. The Bryologist 95(1): 15-19.

Thomas, A. & Rosentreter, R. (1992) Antelope utilization of lichens in the Birch Creek Valley of Idaho. In: Riddle, P. (ed.) Proceedings of the 15th Biennial Pronghorn Antelope Workshop, pp. 58-66. Rock Springs, WY.

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