E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Common Name: The Rock-olive Lichens. Describes the habitat and colour of the upper surface.
Minute, stratified foliose lichens (in BC), umbilicate, rotund to subrotund, corticate above and below, sorediate (in BC), usually without distinct lobes, thallus averaging to 3–10 mm across, rather thick. Upper surface pale olivegrey, with down-rolled margins. Lower surface pale brown, lacking rhizines. Photobiont blue-green.
Apothecia are unknown in the B.C. material.
Over vertical rock.
Notes: Peltula, with approximately 18 species worldwide, occurs primarily at temperate latitudes in arid regions. Of the 15 species reported for North America, only one is known to occur in B.C.

Reactions:
All spot tests negative.

Contents:
No lichen substances reported.