[Navel Lichens: The Genus Umbilicaria East of the Cascade Mountains of Oregon and Washington]

What apears to be Umbilicaria phaea as seen on rock outcrops at the ridgetop of Kamiak Butte, Kamiak Butte County Park, Whitman County, Washington...........April 29, 2013. Two navel lichen species may be shown here, so can anyone verify their identities?

Navel lichen growing on a lichen encrusted basalt rock along the Cherry Orchard Trail about one mile east of Lyle, Washington...........February 9, 2013. The whitish foliose lichen to the left appears to be a Physcia sp.

Navel lichen growing on a lichen encrusted basalt rock on Chenoweth Table near The Dalles, Oregon...........March 28, 2013.

What might be navel lichen (Umbilicaria phaea?) on a basal outcrop along Major Creek, Columbia River Gorge............May 2, 2013.