 Grey lichen on a granite stone in Paltsevo Rock Massif near Svetogorsk Highway near Vyborg. Russia, July 20, 2024
 Resupinate polypore mushroom on a fallen spruce branch in a rocky mountainous area around Paltsevo, near Vyborg. Russia, July 20, 2024
 Rock shield lichen (Xanthoparmelia) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Eroded granite rock formations. Independence Rock west from Casper, Wyoming, July 22, 2010
 Echo Canyon and Little Rock from a slope of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Little Rock from a slope of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Climbing Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Peppered rock-shield lichen (Xanthoparmelia conspersa) on a rock at Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, February 14, 2024
 Peppered rock-shield lichen (Xanthoparmelia conspersa) with apothecia on a rock at Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, February 14, 2024
 Peppered rock-shield lichen (Xanthoparmelia conspersa) with moss on a rock at Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, February 14, 2024
 Round patch of peppered rock-shield lichen (Xanthoparmelia conspersa) on a rock at Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, February 14, 2024
 Growth of peppered rock-shield lichen (Xanthoparmelia conspersa) on a sandstone rock at Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, February 14, 2024
 Rock-shield lichen Xanthoparmelia in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Rock-shield lichen Xanthoparmelia in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 A rock in the middle of Bell Rock Road in Freetown - Fall River State Forest. Massachusetts, August 24, 2003
 Rock-shield lichen (Xanthoparmelia) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Rock abrasion made by visiting tourists in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Rock-shield lichen (Xanthoparmelia) on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Rock-shield lichen Xanthoparmelia in shaded place in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Pedestal rock (differential weathering) near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Rock shield lichen (Xanthoparmelia) on a mossy limestone rock in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Rock shield lichen (Xanthoparmelia)(?) on a limestone rock in a forest in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Mexican yolk lichen (Candelina submexicana) together with Aspicilia on a rock edge in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Rock-shield lichen (Xanthoparmelia) on cracked pink granite of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 Rock-shield lichen Xanthoparmelia and a broken limb of Christmas cactus (Tasajillo, Cylindropuntia leptocaulis) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Buzzard s Roost from Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 View to the north from Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Weathered surface of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Standing on a granite dome of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 The dome of Enchanted Rock from Echo Canyon. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Dome of Enchanted Rock from the top of Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Crass (product of weathering) on Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 The dome of Enchanted Rock from Moss Lake. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 View in direction of Enchanted Rock from the top of Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Slope of the dome of Enchanted Rock, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Erosion of the dome of Enchanted Rock, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Base of the dome of Enchanted Rock, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 - a trip to Mineral Wells with SMU rock climbing club 2/13/97 - downtown Fort Worth (Mineral Wells, Dallas, Texas Hill Country, February 23 - March 14, 1997)
 Exfoliation of slope of the dome of Enchanted Rock, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Peppered rock-shield lichen (Xanthoparmelia conspersa) on a sandstone rock at an overlook point in Bastrop State Park. Bastrop, Texas, February 23, 2020
 Exfoliation of granite slabs from the dome of Enchanted Rock, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Large slabs of granite at the base of the dome of Enchanted Rock, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Granite rocks and a boat in Vyborg Bay from Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Vyborg Bay from Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Moss Lake camping area from a slope of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Slope of the dome of Enchanted Rock in area of Turkey Pass, view from Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Peppered rock-shield lichen (Xanthoparmelia conspersa) on a rock at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
 Peppered rock-shield lichen (Xanthoparmelia conspersa) on a rock on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, December 21, 2023
 Apothecia of peppered rock-shield lichen (Xanthoparmelia conspersa) on a rock at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
 Texture of peppered rock-shield lichen (Xanthoparmelia conspersa) on a rock on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, December 21, 2023
 Granite boulders in Vyborg Bay near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Granite stones on a beach of Vyborg Bay near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Large granite stone in Vyborg Bay near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Large granite boulders in Vyborg Bay near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Peppered rock-shield lichen (Xanthoparmelia conspersa) and sunken rim-lichen (Lecanora oreinoides) on a rock at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, January 25, 2019
 Stony beach of Vyborg Bay near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Map lichen Rhizocarpon petraeum on the surface of a rock in Zakhodskoe, 50 miles north from Saint Petersburg. Russia, July 10, 2016
 Peppered rock-shield lichen (Xanthoparmelia conspersa) and rock-dwelling fern Cheilanthes lindheimeri (Myriopteris lindheimeri, lipfern)(?) on sandstone on Lake Somerville Trailway near Nails Creek Unit of Somerville Lake State Park. Texas, December 21, 2023
 Massif Timna and Timna Valley from western cliffs near Berekh ascent, 13 miles north from Eilat. The Middle East, November 7, 2002
 Yellow daisy in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Skullcap (Scutellaria) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Black and grey map lichen Rhizocarpon petraeum on the surface of a rock in Zakhodskoe, 50 miles north from Saint Petersburg. Russia, July 10, 2016
 Sea bluebells (oysterleaf, Mertensia maritima) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Blue flax (Linum perenne) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Tiny greenish paronychia like flowers in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Stones scattered on a granite base on a beach of Vyborg Bay on Storozhok Peninsula near granite quarry near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 - White Rock Creek Park (Dallas, July 7 - 14, 1996)
 - White Rock Creek Park (Dallas, July 7 - 14, 1996)
 Pine trees growing among granite stones on a beach of Vyborg Bay on Storozhok Peninsula near granite quarry near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Globe thistle (Echinops, Russian name Mordovnik) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Broken slabs of petrified wood on sandstone rock in Old Baylor Park. Independence, Texas, February 7, 2024
 - White Rock Lake (Dallas - Norman OK, July 7 - September 23, 1996)
 - White Rock Lake (Dallas - Norman OK, July 7 - September 23, 1996)
 - White Rock Lake (Dallas - Norman OK, July 7 - September 23, 1996)
 Landscape from Independence Rock west from Casper. Wyoming, July 22, 2010
 - White Rock Lake (Dallas - Norman OK, July 7 - September 23, 1996)
 Autumn catchfly (Silene schafta, Russian name Smoliovka) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Railroad from a bridge above granite cliffs in Vyborg. Russia, May 24, 2019
 Winter rosette of stork s bill (Erodium texanum) on sandstone rock in Old Baylor Park. Independence, Texas, February 7, 2024
 Reddish leaves of stork s bill (Erodium texanum) on sandstone rock in Old Baylor Park. Independence, Texas, February 7, 2024
 Rock-rose (Helianthemum carolinianum) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Silvery-grey leaves of rabbit-head wormwood (Artemisia lagosefala) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Yellow flower of aster family Senecio pseudoarnica (seaside ragwort)(?) in rock garden in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, July 22, 2015
 Rock near Yellowstone Park, view from East Entrance Road. Wyoming, July 24, 2010
 Rock rose (Pavonia) in ultraviolet light behind Nature Center in Lick Creek Park. College Station, Texas, October 6, 2024
 Compact winter rosette of stork s bill (Erodium texanum) on sandstone rock in Old Baylor Park. Independence, Texas, February 7, 2024
 Buellia(?) lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Yellow flower of rock-rose (Helianthemum carolinianum) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Sample of a mineral syenite rock rich with fluorescent sodalite (Yooperlite) glowing under ultraviolet light. College Station, Texas, February 29, 2024
 Two pebbles of a mineral Yooperlite (syenite rock rich with fluorescent sodalite) glowing under ultraviolet light. College Station, Texas, February 29, 2024
 Narva River and Rybatskaya Naberezhnaya Street in Ivangorod (Russia) from Friendship Bridge at Kingiseppsoe Highway. Estonia, July 14, 2024
 Ammunition storehouse in a cave near Vyborg. Russia, July 20, 2024
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