 Hedgehog cactus near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Guadalupe spring from El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain from a trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain Trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 Rocks and El Capitan Mountain from a trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 Split rock and El Capitan Mountain from a trail near Guadalupe Spring in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain and Trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Trail and Mountain in Guadalupe Mountains National Park. Texas, December 27, 2007
 View from beginning of El Capitan Trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Prickly pears near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Cactus on rocks of El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Agaves and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Dead tree from El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Agave, cacti and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Cushion cactus and El Capitan Mountain from a trail in Guadalupe Mountains National Park. Texas, December 27, 2007
 Prickly pears and yucca near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 Alligator juniper (Juniperus deppeana) near El Capitan Trail. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain (zoomed), view to the west in Guadalupe Mountains National Park. Texas, December 27, 2007
 El Capitan Mountain from a trail at the foot of the mountain. Guadalupe Mountains National Park, Texas, December 27, 2007
 Echinocereus cacti growing on ruins of Hunter Line shack in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Magenta tinged prickly pears cactus on northern hill in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 El Capitan Mountain after sunset, view from lower Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain at sunset, view from lower Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain, view from lower Roadside Park at morning. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain, view from upper Roadside Park at morning. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain with cholla cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain from southern foot of the mountain. Guadalupe Mountains National Park, Texas, December 27, 2007
 El Capitan Mountain with prickly pears cactus in foreground, view from upper Roadside Park. Guadalupe Mountains National Park, Texas, December 28, 2007
 El Capitan Mountain at sunset, view from lower Roadside Park south from the mountain. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hedgehog cactus (Echinocereus viridiflorus) on northern hill in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Agave on McKittrick Canyon Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Slopes of Frijole Mountain from McKittrick Canyon Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Rocks on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Dead juniper on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hiker s staircase in Pine Spring Canyon, on Devils Hall Trail. Guadalupe Mountains National Park, Texas, December 28, 2007
 Frozen McKittrick Creek. Guadalupe Mountains National Park, Texas, December 28, 2007
 Grotto in McKittrick Canyon, with icicles. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hunter Line Cabin in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Bark of alligator juniper in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Rocks in Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Big rocks near Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Peeling bark of Texas madrone on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Texas madrone (Arbutus xalapensis) on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Smooth white bark of Texas madrone on Devils Hall Trail in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Upper section of Hiker s Staircase near Devil s Hall in Pine Spring Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Texas madrone in McKittrick Canyon. Guadalupe Mountains National Park, Texas, December 28, 2007
 Hedgehog, or claret cup cactus (Echinocereus triglochidiatus) on the top of Freshman Mountain. Enchanted Rock State Natural Area, Fredericksburg, Texas, December 25, 2018
 Magenta tinged seedling of a desert plant Tetraena qatarense (Zygophyllum qatarense) on Jebel Fuwairit. Qatar, October 3, 2014
 Thorny cluster of hedgehog, or claret cup cactus (Echinocereus triglochidiatus) on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 Purple-tinged prickly pear cactus in the middle part of Smokey Creek Trail. Big Bend National Park, Texas, November 25, 2007
 Purple-tinged prickly pear cactus on Smokey Creek Trail near Trap Spring east from Mule Ear Overlook. Big Bend National Park, Texas, November 25, 2007
 Indian Lodge in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Cliff above Indian Lodge in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 A view from Newfound Gap Road. Smoky Mountains National Park, Tennessee, May 18, 2007
 A view from Clingmans Dome. Smoky Mountains National Park, Tennessee, May 18, 2007
 On a hill south from Indian Lodge in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Yucca on a hill west from entrance in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Oconaluftee River near Newfound Gap Road. Smoky Mountains National Park, Tennessee, May 18, 2007
 Rocks near parking at Clingmans Dome. Smoky Mountains National Park, Tennessee, May 18, 2007
 Purple spineless prickly pears cactus in Davis Mountains State Park. Fort Davis, Texas, December 29, 2007
 Terracotta hedgehog mushrooms (Hydnum rufescens) on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, December 5, 2021
 Chisos Mountains with snow, view from Castalon Highway. Big Bend National Park, Texas, November 25, 2007
 Large wood hedgehog mushrooms (Hydnum repandum) under pines on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, December 5, 2021
 Terracotta hedgehog mushrooms (Hydnum rufescens) with cross section on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, December 5, 2021
 Hericium erinaceus (also called Lion s Mane Mushroom, Bearded Tooth Mushroom, Hedgehog Mushroom, Satyr s Beard, Bearded Hedgehog Mushroom, pom pom mushroom, or Bearded Tooth Fungus) on a tree in Huntsville Park. Texas, December 28, 2013
 Cross section of large wood hedgehog mushroom (Hydnum repandum) on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, December 5, 2021
 Caps of large wood hedgehog mushrooms (Hydnum repandum) under pines on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, December 5, 2021
 Chisos Mountains with traces of snow, view from Castalon Highway (Ross Maxwell Scenic Drive). Big Bend National Park, Texas, November 25, 2007
 Near Macey Lakes Trail in Sangre de Cristo Mountains. Colorado, July 3, 2007
 Appalachian Trail on a ridge of Kittatinny Mountains. Delaware Water Gap, New Jersey, May 12, 2007
 Aspens near Horn Creek trail in Sangre de Cristo Mountains. Colorado, June 30, 2007
 Lace cactus (Echinocereus reichenbachii) on Freshman Mountain in Enchanted Rock State Natural Area. Fredericksburg, Texas, December 25, 2018
 View of a slope of Colony Baldy Mountain from Macey Lakes Trail in Sangre de Cristo Mountains. Colorado, July 2, 2007
 A group of people from Dallas Sierra Club near Macey Lake Trail in Sangre de Cristo Mountains. Colorado, July 2, 2007
 Lace cactus (Echinocereus reichenbachii) near a trail in Bastrop State Park. Bastrop, Texas, April 15, 2023
 Violet (magenta) coral mushrooms (Clavaria zollingeri) or may be Clavulina amethystina in Big Creek Scenic Area of Sam Houston National Forest. Shepherd, Texas, October 28, 2018
 Lace cactus (Echinocereus reichenbachii) at Lost Pines Loop Trail in Bastrop State Park. Bastrop, Texas, July 28, 2018
 Southern slope of El Capitan behind spruce trees from a bus on Northside Drive in Yosemite National Park. California, March 17, 2024
 Echinocereus reichenbachii (lace cactus) with fire ant mounds at Lost Pines Trail in Bastrop State Park. Bastrop, Texas, March 19, 2022
 El Capitan and valley of Merced River from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 - trip to Wichita Mountains with OU Timberline Explorers club Nov. 22, 23 (Norman, Wichita Mountains, November 15 - December 1, 1996)
 Claret cup cactus (Echinocereus triglochidiatus) north from Capulin Canyon in Bandelier National Monument. New Mexico, near Los Alamos, May 24, 2008
 El Capitan, Half Dome and valley of Tenaya Creek from Tunnel View overlook on Wawona Road in Yosemite National Park. California, March 17, 2024
 Caps of wood hedgehog mushrooms (Hydnum repandum)(?) on Kirby Trail in Big Thicket National Preserve. Warren, Texas, November 10, 2018
 Terracotta hedgehog mushrooms (Hydnum sect. Rufescentia) on Kirby Trail in Big Thicket National Preserve. Warren, Texas, November 10, 2018
 Wood hedgehog mushrooms (Hydnum repandum) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 4, 2022
 Underside of wood hedgehog mushrooms (Hydnum repandum) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, May 4, 2022
 Southern slope of El Capitan from a bus on Northside Drive west from Yosemite Village in Yosemite National Park. California, March 17, 2024
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