 Close-up of crustose lichen Lecanora muralis (Protoparmeliopsis muralis) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Grey crustose lichen Aspicilia on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Rosette of yellow map lichen (Rhizocarpon geographicum) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Yellow map lichen (Rhizocarpon geographicum) and another crustose yellow lichen on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Physcia lichen on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Yellow map lichen (Rhizocarpon geographicum) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Rock shield lichen (Xanthoparmelia) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Brown crustose lichen on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Growth of yellow map lichen (Rhizocarpon geographicum) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Rosette lichen (Physcia) with Lecanora muralis (Protoparmeliopsis muralis) on sandstone of Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Patch of rosette lichen (Physcia) with Lecanora muralis (Protoparmeliopsis muralis) on sandstone of Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Circular round patch of yellow map lichen (Rhizocarpon geographicum) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Rosette lichen Physcia on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Close-up of rosette lichen Physcia on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Elegant sunburst lichen Rusavskia elegans (formerly Xanthoria elegans) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Close-up of elegant sunburst lichen Rusavskia elegans (formerly Xanthoria elegans) on a granite boulder on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) in Pedernales Falls State Park. Johnson City, Texas, January 11, 2019
 Various crustose lichens on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) with caloplaca on sandstone in Bastrop State Park. Bastrop, Texas, October 13, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on a horizontal surface of a tomb in Calvert Cemetery. Calvert, Texas, January 8, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone at Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, October 13, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on a sandstone rock at an overlook point in Bastrop State Park. Bastrop, Texas, February 23, 2020
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone bench at Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, October 13, 2019
 Patch of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Close up of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone of Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone bench near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, February 28, 2021
 Texture of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on a sandstone rock at an overlook point in Bastrop State Park. Bastrop, Texas, February 23, 2020
 Close-up of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on a sandstone rock at an overlook point in Bastrop State Park. Bastrop, Texas, February 23, 2020
 Apothecia of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone of Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on Caloplaca on sandstone of Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) with caloplaca on sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Close up of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Diploschistes actinostomus together with stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on a sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Close-up of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone bench near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, February 28, 2021
 Texture of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone bench at Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, October 13, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) among Acarospora on sandstone bench near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, February 28, 2021
 Apothecia of stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on sandstone bench near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, February 28, 2021
 Diploschistes actinostomus and stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) on a sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) with Squamulea squamosa (Caloplaca squamosa) on sandstone of Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Stonewall rim-lichen (Lecanora muralis, Protoparmeliopsis muralis) with Squamulea squamosa (Caloplaca squamosa) on sandstone near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Diploschistes actinostomus(?) and Lecanora muralis (Protoparmeliopsis muralis) together with other lichens near Lost Pines Overlook in Bastrop State Park. Bastrop, Texas, March 14, 2019
 Texture of elegant sunburst lichen Rusavskia elegans (formerly Xanthoria elegans) on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Close-up of green moss on granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Texture of green moss on granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Xanthoparmelia and Rhizocarpon geographicum lichens on a granite shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Rapakivi granite with large round crystals on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Granite rocks and a boat in Vyborg Bay from Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Common groundsel (Senecio vulgaris) on granite of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Flowers of stonecrop (Sedum, Hylotelephium telephium(?)) on shore of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Vyborg Bay from Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Shores of Gvardeysky Island. Vyborg, Russia, July 20, 2024
 A house at 40 Geroev Street in Gvardeysky Island. Vyborg, Russia, July 20, 2024
 Black Lecanora like lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Black apothecia of Lecanora like lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Some crustose lichen at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 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
 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
 Grey lichen on a granite stone in Paltsevo Rock Massif near Svetogorsk Highway near Vyborg. Russia, July 20, 2024
 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
 Mexican yolk lichen (Candelina submexicana) together with granite rosette lichen (Physcia halei) at the edge of a granite stone in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Map lichen Rhizocarpon petraeum on a granite boulder in Zakhodskoe (Lounatjoki), 50 miles north from Saint Petersburg. Russia, May 22, 2021
 Interior of a small granite cave near Vyborg. Russia, July 20, 2024
 Crustose lichen with bright orange fluorescence on a granite tomb when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight in Odd Fellow Cemetery. Anderson, Texas, November 9, 2024
 Round patches of crustose lichen with bright orange fluorescence on a granite tomb both in natural light and under 365 nm ultraviolet (UV-A) blacklight in Odd Fellow Cemetery. Anderson, Texas, November 9, 2024
 Examining a granite cliff during a geological tour near Vyborg. Russia, July 20, 2024
 Golden lichen Xanthoria parietina with another grey crustose lichen on a stone in Pavlovsk Park. Pavlovsk, suburb of Saint Petersburg, Russia, July 31, 2024
 Crater lichen Diploschistes scruposus together with dark-brown lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Grey crustose lichen Aspicilia with firedot lichen Caloplaca on granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Grey crustose lichen Aspicilia with orange firedot lichen Caloplaca on granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Common grey crustose lichen Aspicilia (sunken disk lichen) on granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Ivy-Leaved Toadflax (Cymbalaria muralis) in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, May 10, 2016
 Diploschistes lichen on granite in Monrepos Park in Vyborg. Russia, May 24, 2019
 Gold cobblestone lichen Pleopsidium flavum (Pleopsidium oxytonum)(?) mixed with a grey crustose lichen on granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Buellia(?) lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Yellow map lichen (Rhizocarpon geographicum) on granite in Monrepos Park in Vyborg. Russia, May 24, 2019
 Some black Buellia(?) lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Cladonia lichen at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Some brown Acarospora(?) lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Powdered sunshine lichen (Vulpicida pinastri) and another crustose lichen on a conifer log in Petiayarvi, north from Saint Petersburg. Russia, August 3, 2024
 Some grey folios lichen at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Yellowish dust-like lichen on vertical granite surface in Monrepos Park in Vyborg. Russia, May 24, 2019
 Some grey sorediate Parmelia(?) lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Thick crust of some greenish lichen on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Yellowish dust-like lichen at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Crater lichen Diploschistes scruposus on a granite cliff in Monrepos Park in Vyborg. Russia, May 24, 2019
 Crater lichen Diploschistes scruposus on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Folious lichens on a stone on Storozhok Peninsula near granite quarry near Stony Trail (Kamenistaya Tropa) in Kivi Park south from Chulkovo, west from Vyborg. Russia, July 27, 2024
 Dark brown Acarospora(?) lichen at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Yellow map lichen (Rhizocarpon geographicum) at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Crater lichen Diploschistes scruposus at the foot of granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Small foliose lichen Cladonia incrassata(?) on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Close up of crater lichen Diploschistes scruposus on granite cliffs in Monrepos Park in Vyborg. Russia, May 24, 2019
 Salted shield lichen (crottle, Parmelia saxatilis) on granite in Monrepos Park in Vyborg. Russia, May 24, 2019
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