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

Texosporium sancti-jacobi (Tuck.) Nádv. ex Tibell & Hofsten

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Scientific name
Texosporium sancti-jacobi
(Tuck.) Nádv. ex Tibell & Hofsten
Common names
IUCN Specialist Group
Assessment status
Preliminary Assessed
Preliminary Category
EN B2ab(i,ii,iii,iv,v)
Proposed by
Jessica Allen
Jason Hollinger, Daphne Stone
Jason Hollinger
Comments etc.
Jessica Allen, Amanda Chandler

Assessment Notes


AOO is 204 km² is very restricted, with severely fragmented distribution and on-going decline in EOO, AOO, extent of habitat (owing to fire and development), subpopulations, and overall population.

Taxonomic notes

Why suggested for a Global Red List Assessment?

Geographic range

Widespread disjunct populations in western North America, from California to Washington and Idaho.
EOO = 649,455 km2
AOO = 204 km2

Population and Trends

At least in Idaho, many known subpopulations have been extirpated by grazing, road construction, ...  Some chaparral subpopulations have been extirpated by fire?

In WA grazing has made a huge impact that we cannot document because there is no baseline. However, after seeing one site with large thalli we realized how fragmented and degraded the thalli are in grazed areas.

Possibly severely fragmented because dispersal mechanism of spores is unknown and likely very limited.
Cattle trampling fragments thalli and degrades what is left.

Population Trend: Stable

Habitat and Ecology

Oldgrowth, stable sagebrush and chaparral habitats. In these habitats, lithosols, where rock cobble protects thalli from grazing in 2 ways; physically and by discouraging grazing (grass doesn’t grow there).

Temperate ShrublandTemperate GrasslandTemperate


Grazing, fire, development, agriculture, cheatgrass invasive species, misguided restoration activities, fuel breaks.

Housing & urban areasAgro-industry farmingNomadic grazingAgro-industry grazing, ranching or farmingRoads & railroadsRecreational activitiesIncrease in fire frequency/intensityNamed speciesNutrient loadsSoil erosion, sedimentation

Conservation Actions

Listed G3, N3 in US (United States Rare Lichen Project (ISSSSP website)
Oregon ORBIC S2, Sensitive
Washington S1, Threatened
Recommendations: limit grazing time on leases, terminate leases where TESA is declining and do not reopen grazing on BLM lands that are ungrazed or have not been grazed for 20 years or more. Do not place feed, salt or water troughs in areas with TESA.

Site/area protectionInvasive/problematic species controlHabitat & natural process restorationAwareness & communications

Research needed

Estimates of population size and trend would be helpful for improving threat assessment.
Possible use of exclosures to understand its ecology better. Terminate grazing leases to understand recovery better.

Population size, distribution & trendsLife history & ecologyThreatsArea-based Management PlanPopulation trends

Use and Trade

This species has no known commerical or cultural uses.


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted