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Ron Thill: Lichen covered fence - - Castle Creek Rd., CO/09
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Ron Thill: Lichen covered fence - - Castle Creek Rd., CO/09
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Ron Thill: Rock lichens - - Castle Creek Road, south of Aspen, CO
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Ron Thill: Lichens on igneous rock - - Steens Mountain, OR/07
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Ron Thill: Lichens - - Chiricahua National Monument, AZ/11
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Ron Thill: Lichens - - Wind Cave National Park, SD/06
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Ron Thill: Lichens - - Iron Mountain Road, Custer State Park, SD/05
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Ron Thill: Lichens - - Charles M. Russell NWR, MT/06
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Ron Thill: Lichen - - National Bison Range, MT/06