 Trunk of dead hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Peeling bark of dead hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Drying hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Rotten hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Warty texture of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Texture of dried hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Warts on the bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Trunk of dried hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Texture of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Peeling bark of dry hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Gnarl on a dead tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 17, 2012
 Bark of dead hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Blackened trunk of dead hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Detail of bark of dead hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 White fringe lichen (Heterodermia albicans) (or may be H. japonica, H. casarettiana) on hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Leaves of hackberry tree with Asian woolly hackberry aphids Shivaphis celti (Homoptera: Aphididae) and sooty black mold (fungal growth) in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 5, 2019
 Trunk of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 30, 2010
 Scar of a trunk of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 30, 2010
 Lecanora lichen on hackberry(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020
 A twig of hackberry tree with fruits in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 20, 2012
 Tree bark in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Mistletoe on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Some green liverwort and lichens on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Mixed crustose lichens on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 Script lichen (Graphis) on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Tiny green liverwort on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Dirinaria(?) lichen on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Texture of bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 17, 2012
 Rough tree bark in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Fringe lichen (Heterodermia) on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Blackened bark of dried tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Common button lichen (Buellia stillingiana) on hackberry(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020
 Script lichen Graphis lineola(?) on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 White fringe lichen (Heterodermia albicans) on a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Medallion lichen (Dirinaria confusa) on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Saucer lichen Ochrolechia pallescens on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 Medallion lichen (Dirinaria confusa) on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 Script lichen Graphis lineola on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 Sooty black mold fungus on leaves of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Saucer lichen Ochrolechia pallescens on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Details of script lichen (Graphis) on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Texture of script lichen (Graphis) on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Warty texture of bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 17, 2012
 Detail of a dead tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Medallion lichen (Dirinaria confusa) on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Saucer lichen Ochrolechia pallescens on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Warts on bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2010.
 Apothecia of saucer lichen Ochrolechia pallescens on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Sunken bloodspot lichen (Haematomma persoonii) on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 Saucer lichen Ochrolechia pallescens with apothecia on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Tiny green liverwort and Graphis lichen on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Close up of medallion lichen (Dirinaria confusa) on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 White fringe lichen (Heterodermia albicans) on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Apothecia of medallion lichen (Dirinaria confusa) on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Close up of medallion lichen (Dirinaria confusa) on hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Bark at the base of large black willow tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Script lichen Graphis lineola and other crustose lichens on bark of a hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 29, 2018
 Common button lichen (Buellia stillingiana) (black) together with Lecanora on hackberry(?) tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020
 Texture of white fringe lichen (Heterodermia albicans) on bark of hackberry tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 28, 2019
 Smooth shadow-crust lichen (Hyperphyscia syncolla) on a hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 12, 2019
 Warty texture with corky ridges of bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2010.
 Black Sordariomycetes fungi on an old dead osage orange tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020
 Turtle skeleton and a half-rotten horse apple (osage orange) among leaves of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 20, 2012
 Olive patch of smooth shadow-crust lichen (Hyperphyscia syncolla) on a hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 12, 2019
 Close-up of black Sordariomycetes fungi on an old dead barkless osage orange tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 24, 2020
 Line of small holes with sap oozing from them bored by birds (Yellow-Bellied Sapsucker, Sphyrapicus varius) in trunk of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 3, 2010.
 Dry leaves of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, July 10, 2011
 Detail of hackberry bark in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 12, 2020
 Texture of tree bark in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 20, 2012
 Grasshopper on a tree trunk in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 17, 2012
 Bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Tiny liverwort on bark of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Bark of dry hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Shoot of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, March 17, 2019
 Hebeloma mushrooms under oak and hackberry trees in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 25, 2020
 Close up of a grasshopper on a tree trunk in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 17, 2012
 Rotting tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 16, 2011
 Detail of trunk of dry hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Warts on bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Lichen Dirinaria confusa(?) on bark of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Corky bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 30, 2010
 Decomposing bark of dry hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Script lichen (Graphis) on bark of hackberry in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Detail of bark of dry hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Warty bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Corky ridges of bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 16, 2010
 Dry leaves of hackberry (Celtis occidentalis) on roadside in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 6, 2013
 Stump of dried cedar tree near Loop Trail in Washington-on-the-Brazos State Historic Site. Washington, Texas, May 8, 2012
 Fibrous tree trunk in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 16, 2011
 Lichens in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Sapsucker holes in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 8, 2012
 Map-like texture of lichens on bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, November 3, 2020
 Corky ridges of bark of hackberry (Celtis occidentalis) in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 30, 2010
 Berries of hackberry (Celtis occidentalis) in animal droppings in Washington-on-the-Brazos State Historic Site. Washington, Texas, December 10, 2011
 Alligator texture of rotting tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 16, 2011
 Fibrous tree trunk of cedar in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 16, 2011
 Fringe lichen (Heterodermia) on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, January 23, 2019
 Gulf fritillary (Agraulis vanillae) butterfly on a tree in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 20, 2012
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