University of Washington Herbarium
Catalog #: WTU-L-033689
Occurrence ID (GUID): 729188fd-d698-41d0-b240-97d5fa5bf608
Secondary Catalog #: Other: S 465 A, Other: S 465 A
Taxon: Psora rubiformis (Ach.) Hook.
Family: Psoraceae
Determiner: G. Y. McHenry (2002-04-02)
ID Remarks: Determined at the University of Washington.
ID References: Esslinger & Egan 1995: Bryologist 98(4): 467-549
Show Determination History
Collector: S. Shushan, W. A. Weber   23   
Date: 1959-03-12
Verbatim Date: 1959-3-12
Locality: U.S.A., Colorado, Boulder, West base of Steamboat Mountain, foothills of Front Range 2 miles N. W. of Lyons.
Elevation: 1900 meters Verbatim Elevation: 1900 m.
Habitat: On shelving horizontal surfaces of sandstone ledges.
Notes: Forms with pale greenish thalli are characteristic of alpine sites, while the rufous cortical color is developed in stable habitats at lower altitudes with high insolation. The development of a white edge to the thallus is variable in both habitats. Desert forms occurring exclusively on soil have a pale thallus which becomes heavily pruinose. There are no morphological characters of any value to consistently separate these forms. Deeply concave squamules with recurved margins are characteristic of the soil forms. Substrate: saxicolous.
Specimen Images
Rights Holder: University of Washington Herbarium
Record ID: 9bfcffaf-1faa-4b65-a796-736956785fb8
For additional information on this specimen, please contact: David Giblin (
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