 Sabinal River from East Trail in Lost Maples State Natural Area. Vanderpool, Texas, December 30, 2007
 Maples near East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Water stream of Can Creek from West Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Hillside view west from East Trail in Lost Maples State Natural Area, close to parking. Vanderpool, Texas, November 8, 2008
 Ponds of Can Creek from an overlook of East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Ponds of Can Creek from western section of East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Rocks and Can Creek from western section of East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Rock shelters of Hale Hollow Creek near East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Western section of East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Stones and trees in Lost Maples State Natural Area, on East Trail. Vanderpool, Texas, November 7, 2008
 Back-lit trees on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Pond with rocks in Lost Maples State Natural Area, on East Trail. Vanderpool, Texas, November 7, 2008
 Rock shelters of Hale Hollow Creek East Trail in Lost Maples State Natural Area, at evening. Vanderpool, Texas, November 8, 2008
 Prickly pears cactus on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 East Trail crowded by park visitors in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Foliage on western section of East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Red foliage of bigtooth maple on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Red foliage of maple trees in Lost Maples State Natural Area, on East Trail. Vanderpool, Texas, November 7, 2008
 Reddish maple leaves in Lost Maples State Natural Area, on East Trail. Vanderpool, Texas, November 7, 2008
 Fall foliage of bigtooth maple on East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 East Trail on a grassy terrace in Lost Maples State Natural Area, close to parking. Vanderpool, Texas, November 8, 2008
 Rocks and trees near western section of East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Bigtooth maple in Lost Maples State Natural Area, near parking. Vanderpool, Texas, November 7, 2008
 Sabinal River in Lost Maples State Natural Area, near parking. Vanderpool, Texas, November 7, 2008
 Ball moss (Tillandsia recurvata) on a maple tree in Lost Maples State Natural Area, on East Trail. Vanderpool, Texas, November 7, 2008
 Rocks, a pond and a foot bridge of Maple Trail, view from East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Ball moss (Tillandsia recurvata) in tangled balls around a tree branch in Lost Maples State Natural Area, on East Trail. Vanderpool, Texas, November 7, 2008
 Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
 Passage between stones on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
 Cacti on a slope of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 24, 2007
 Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Weathering of rocks near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Rocks east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Lichens on rocks near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Cacti east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Prickly pear cactus on Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Rocks on a slope of Freshman Mountain east from Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Pedestal rock (differential weathering) near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Climbing Turkey Peak in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Buds of maples, in Delaware and Raritan Canal State Park, near Carnegie Lake. Princeton, New Jersey, May 5, 2007
 Weathered stones on a slope of Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Heathcote Farm (1857, a former State juvenile detention center, now Withington Estate) in Cook Natural Area. Kingston, New Jersey, May 11, 2007
 Trail around Hamilton Pool and waterfall. West from Austin, Texas, December 20, 2008
 Area of Echo Canyon in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Lost Falls near Blue Trail in DeSoto State Park on Lookout Mountain. Fort Payne, Alabama, May 19, 2007
 A deer on Linear Park Trail (former railroad) in Cook Natural Area, near Ridge Road. Kingston, New Jersey, May 11, 2007
 Green moss in area of water seepage in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Mushroom rocks (differential weathering of shaded sides of rocks) in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Lost Pines Trail in Bastrop State Park. Bastrop, Texas, November 4, 2007
 Lost Pines Trail in mist in Bastrop State Park. Bastrop, Texas, November 4, 2007
 Close up of leather lichen Dermatocarpon luridum in water seepage area on granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 "Natural entrance" to Carlsbad Caverns. New Mexico, December 26, 2007
 Dry squamulous lichen Cladonia growing on moss Grimmia with hyaline hairpoints in shady area in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Dry trees in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Many Warts mushroom (Amanita polypyramis) on Lost Pines Trail in Bastrop State Park. Bastrop, Texas, November 4, 2007
 Weathered surface of Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 View to the north from 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
 Crass (product of weathering) on Enchanted Rock in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Serpentine path of "Natural entrance" to Carlsbad Caverns. New Mexico, December 26, 2007
 Lichens covering granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Various lichens on a granite stone in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Firedot lichen (Caloplaca) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 A boardwalk in Cook Natural Area in fog. Princeton, New Jersey, March 23, 2007
 Moonglow lichen (Dimelaena oreina)(?) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Buzzard s Roost from the top of Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Yellow stonecrop (Sedum nuttallianum) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Hamilton Creek below the waterfall, in Hamilton Pool Preserve. West from Austin, Texas, December 20, 2008
 Hamilton Pool and waterfall. West from Austin, Texas, December 20, 2008
 A waterfall of a creek flowing from Sunfish Pond, near Mine Road. Delaware Water Gap, New Jersey, May 12, 2007
 Cypress on Hamilton Creek below the waterfall, in Hamilton Pool Preserve. West from Austin, Texas, December 20, 2008
 Pools of Hamilton Creek below the waterfall, in Hamilton Pool Preserve. West from Austin, Texas, December 20, 2008
 A marsh in Cook Natural Area at sunset. Kingston, New Jersey, April 2, 2007
 A marsh boardwalk in Cook Natural Area. Princeton, New Jersey, March 23, 2007
 A boardwalk in Cook Natural Area through a marsh in fog. Princeton, New Jersey, March 23, 2007
 View of the granite dome from Echo Canyon. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Weathered pedestal rocks at the top of Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Sunken disk lichen Aspicilia (grey) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Peruvian spike-moss (Selaginella peruviana) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Blooming dwarf vervain (Glandularia pumila) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Brownish leather lichen Dermatocarpon luridum in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 The most common grey crustose lichen Aspicilia in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Seedlings of yellow stonecrop (Sedum nuttallianum) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Firedot lichen Caloplaca on granite stone in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Cypress trees in Hamilton Creek below the waterfall, in Hamilton Pool Preserve. West from Austin, Texas, December 20, 2008
 Cypress knees in Hamilton Creek below the waterfall, in Hamilton Pool Preserve. West from Austin, Texas, December 20, 2008
 A waterfall of the creek going fron Sunfish Lake, near Woodcock Bar campground. Delaware Water Gap, New Jersey, April 14, 2007
 A small waterfall of Dunnfield Creek south from Sunfish Pond. Delaware Water Gap, New Jersey, March 31, 2007
 Cypress trees and roots in Hamilton Creek below the waterfall, in Hamilton Pool Preserve. West from Austin, Texas, December 20, 2008
 Dark brown crustose lichen Caloplaca on granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Lace cactus (Echinocereus reichenbachii) on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Blue-edged scale lichen (Psorula rufonigra) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Pigtail moss (Weissia controversa) in a shady place in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Speckled shield lichen (Punctelia) in a shady place in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Yellow cobblestone lichen Acarospora socialis on pink granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Brown lichen Caloplaca with other crustose lichens on pink granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Narrow lobes of granite rosette lichen (Physcia halei) in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Tiny yellow flower of aster family on pink granite in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Dry leather lichen (Dermatocarpon) on a horizontal granite surface in shade in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
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