 Yellow thistle (Bull thistle, Cirsium horridulum) on Richards Loop Trail in Sam Houston National Forest. Texas, April 13, 2024
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2018
 Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 11, 2018
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 6, 2022
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 12, 2024
 Flower of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
 Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 14, 2019
 Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 5, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) on a recently built pipeline in Lick Creek Park. College Station, Texas, April 12, 2021
 Metallic beetles in yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline right-of-way in Lick Creek Park. College Station, Texas, April 12, 2021
 Flower of yellow thistle (Bull thistle, Cirsium horridulum) with a bronze beetle in Lick Creek Park. College Station, Texas, April 5, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum)(?) in Bastrop State Park. Bastrop, Texas, March 17, 2018
 Flower bud of yellow thistle (Bull thistle, Cirsium horridulum) on Post Oak Trail in Lick Creek Park. College Station, Texas, March 26, 2019
 Yellow thistle (Bull thistle, Cirsium horridulum) on Whitman Road, near Washington. Texas, March 22, 2009
 Yellow thistle (Bull thistle, Cirsium horridulum) on a forest opening over a sewage line in Lick Creek Park. College Station, Texas, March 31, 2023
 Yellow thistle (Bull thistle, Cirsium horridulum)(?) on mulch in a tree utilization site in Bastrop State Park. Bastrop, Texas, March 17, 2018
 Blooming yellow thistle (Bull thistle, Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 2021
 Yellow spiny thistle (Bull thistle, Cirsium horridulum) at sunrise in Lake Bryan Park. Bryan, Texas, April 13, 2010
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, March 31, 2024
 Rosette of leaves of yellow thistle (Bull thistle, Cirsium horridulum) in Lick Creek Park. College Station, Texas, January 10, 2024
 Seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Arrangement of seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Fluffy seeds of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Blooming bull thistle (Cirsium horridulum) on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
 Top view of Bull thistle (Cirsium horridulum) on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
 Immature seed head of yellow thistle (Bull thistle, Cirsium horridulum) on sewage line right-of-way in Lick Creek Park. College Station, Texas, May 2, 2023
 Basal leaves of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
 Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
 Winter rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 11, 2021
 Large thorny rosette of yellow thistle (Bull thistle, Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, February 25, 2021
 Yellow thistle (Bull thistle, Cirsium horridulum) in Lake Bryan Park. Bryan, Texas, March 20, 2010.
 Yellow flower of bull thistle (Cirsium horridulum) in Lick Creek Park. College Station, Texas, April 18, 2022
 Bull thistle (Cirsium horridulum) on a forest clearing on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, April 11, 2021
 Rosette of leaves of thistle (Cirsium) in a pine forest on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, May 19, 2018
 Yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Fluffy seeds of bull thistle (Cirsium horridulum) in Lick Creek Park. College Station, Texas, May 7, 2018
 Rosette and yellow flowers of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Side view of a large yellow flower of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Bull thistle (Cirsium horridulum) in Bastrop State Park. Bastrop, Texas, April 25, 2021
 Winter rosette of bull thistle (Cirsium horridulum) with freeze in Lick Creek Park. College Station, Texas, January 3, 2022
 Opening flower of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Large flower bud of bull thistle (Cirsium horridulum) on a pipeline clearing in Lick Creek Park. College Station, Texas, March 24, 2021
 Bull thistle (Cirsium horridulum) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, April 5, 2020
 Leaves of bull thistle (Cirsium horridulum) in ultraviolet light on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Rosette of bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Icy rosettes of bull thistle (Cirsium horridulum)(?) on a golf course on campus of Texas A and M University. College Station, Texas, February 14, 2021
 Rosette of basal leaves of bull thistle (Cirsium horridulum) in ultraviolet light on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Leaves of bull thistle (Cirsium horridulum) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
 Rosette of leaves of bull thistle (Cirsium horridulum) in area of a former pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, February 20, 2022
 Thorny leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Basal leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Winter rosette of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Smaller rosette of basal leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Central area of rosette of basal leaves of bull thistle (Cirsium horridulum) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on a sewage line right of way in Lick Creek Park. College Station, Texas, November 15, 2024
 Thistle (Cirsium) on Richards Loop Trail in Sam Houston National Forest. Texas, April 21, 2022
 Some yellow and white web-like fungus on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Black caterpillar with yellow stripes fallen from a tree on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Yellow patches (yellow-dust, or orange) Amanita mushroom (Amanita flavoconia) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, July 7, 2018
 Some pale yellow gilled mushrooms on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, September 15, 2018
 Thistle flower (Cirsium) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 21, 2018
 Thistle (Cirsium engelmannii) in Washington-on-the-Brazos State Historic Site. Washington, Texas, April 12, 2018
 Climacodon pulcherrimus (Donkia pulcherrima) mushrooms on Lone Star Trail in Sam Houston National Forest, near Huntsville. Texas, April 8, 2018
 Yellow-dust Amanita mushroom (Amanita flavoconia) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, July 7, 2018
 Yellow-dust Amanita mushrooms (Amanita flavoconia) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville. Texas, October 21, 2018
 Lentinus arcularius mushrooms on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Side view of yellow-dust Amanita mushroom (Amanita flavoconia) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, July 7, 2018
 Deceiver mushrooms (Laccaria laccata) in a pine and oak forest on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Mushroom Amanita lavendula group in a pine forest on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 A pink brittlegill mushroom (Russula) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Mushroom Amanita lavendula group on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Deceiver mushrooms Laccaria bicolor(? on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 28, 2018
 Pink brittlegill mushroom (Russula) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Common selfheal (Prunella vulgaris) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 28, 2018
 Brown resupinate Hydnaceae mushrooms on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Cap of bolete mushroom Suillus hirtellus(?) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Deceiver mushrooms (Laccaria laccata) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Red brittlegill mushroom Russula flavisiccans on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Pink brittlegill mushroom Russula flavisiccans(?) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Dissected red brittlegill mushroom Russula flavisiccans on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Sweet tooth mushrooms (Hydnum repandum) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Group of bolete mushrooms Suillus hirtellus(?) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Dissected bolete mushroom Suillus hirtellus(?) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Mycetinis mushrooms growing from a fallen oak leaf on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Death cap mushrooms (Amanita sect. Phalloideae) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Young deceiver mushrooms (Laccaria laccata) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Tarcrust fungus (Biscogniauxia) on a fallen branch on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Close up of small milkcap mushrooms Lactarius neotabidus on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 28, 2018
 Close up of tarcrust fungus (Biscogniauxia) on a fallen branch on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Brown crust Hydnaceae fungus on a fallen oak branch on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Rosette of leaves of elephant foot (Elephantopus carolinianus) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 28, 2018
 Cinnabar-red chanterelle mushrooms (Cantharellus cinnabarinus or may be C. texensis) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Some porous crust fungus on underside of a fallen tree on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Young sweet tooth mushrooms (Hydnum repandum) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 22, 2018
 Small milkcap mushrooms Lactarius neotabidus on wet burnt soil on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville, Texas, April 28, 2018
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