 Violet wood sorrel (Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 3, 2024
 Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Violet wood sorrel (shamrock, Oxalis violacea) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Flowers of Violet Wood Sorrel (Oxalis violacea) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Flower of Violet Wood Sorrel (Oxalis violacea) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Back lit Violet Wood Sorrel (Oxalis violacea) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Violet Wood Sorrel (Oxalis violacea) blooming at fall without leaves in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 22, 2011
 Cap of a brittlegill (Russula) mushroom both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Cross section of a bolete mushroom both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Underside of a brittlegill (Russula) mushroom both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Section of a brittlegill (Russula) mushroom both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Violet wood sorrel (Oxalis violacea) on Lone Star Hiking Trail in Sam Houston National Forest west from Richards. Texas, April 9, 2019
 Blooming mountain mint (Pycnanthemum tenuifolium) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Shoots of loblolly pine (Pinus taeda) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Flower of violet wood sorrel (Oxalis violacea) on Lone Star Hiking Trail in Sam Houston National Forest west from Richards. Texas, April 9, 2019
 Elegant gayfeather (pinkscale, Liatris hesperelegans, former L. elegans) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Flowers of St. Andrew cross (Hypericum, Ascyrum hypericoides) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Violet wood sorrel (Oxalis violacea) on Sundew Trail in Big Thicket National Preserve. Kountze, Texas, August 2, 2014
 Caps of polypore mushrooms Ganoderma sessile both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, September 13, 2024
 Soft green-eyes (Berlandiera pumila) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, October 19, 2024
 Yellow wood sorrel (shamrock, Oxalis dillenii?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Violet wood sorrel (shamrock, Oxalis violacea?) in Big Thicket park on Sundew Trail. Texas, October 11, 2008
 Violet wood sorrel (shamrock, Oxalis violacea?) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, April 5, 2009
 Violet wood sorrel (Oxalis violacea, shamrock) on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, February 15, 2020
 Violet wood sorrel (shamrock, Oxalis violacea?) near a pond in Washington-on-the-Brazos State Historic Site. Washington, Texas, September 21, 2008
 Pink flower of Violet wood sorrel (Oxalis violacea, shamrock) on Prairie Trail in Brazos Bend State Park. Needville, Texas, April 22, 2008
 Bloomin violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Flowers of violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Pink flowers of Violet wood sorrel (Oxalis violacea, shamrock) on Hoots Hollow Trail in Brazos Bend State Park. Needville, Texas, February 15, 2020
 Pink flowers of violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Back lit flowers of violet wood sorrel (Oxalis violacea, shamrock) in Little Thicket Nature Sanctuary. Cleveland, Texas, March 25, 2023
 Basket grass (Oplismenus hirtellus) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, October 10, 2024
 Flowers of Virgin s Bower (Clematis virginiana) both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on Stubblefield section of Lone Star hiking trail in Sam Houston National Forest. Texas, September 15, 2024
 Inflorescence of Virgin s Bower (Clematis virginiana) both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on Stubblefield section of Lone Star hiking trail in Sam Houston National Forest. Texas, September 15, 2024
 Pineapple bolete mushroom (Boletellus ananas) both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on Stubblefield section of Lone Star hiking trail in Sam Houston National Forest. Texas, September 15, 2024
 Seeds of beefsteak plant (Perilla frutescens) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, October 10, 2024
 White flowers of aster Symphyotrichum drummondii both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, October 10, 2024
 Fertile fronds of bead fern (Onoclea sensibilis) both in natural light and under 365 nm ultraviolet (UV-A) blacklight collected on Stubblefield section of Lone Star hiking trail in Sam Houston National Forest. Texas, September 15, 2024
 Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Flowers of yellow wood sorrel (Oxalis stricta) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Yellow wood sorrel (shamrock, Oxalis dillenii?) in Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, May 26, 2012
 Dark brown-violet pinkgill mushrooms (Entoloma or Nolanea, Leptonia) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 7, 2024
 Gills of dark brown-violet pinkgill mushrooms (Entoloma or Nolanea, Leptonia) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 7, 2024
 Violet Wood Sorrel (Oxalis violacea) in dew blooming at fall without leaves in Washington-on-the-Brazos State Historic Site. Washington, Texas, October 20, 2013
 Blooming yellow wood sorrel (shamrock, Oxalis dillenii?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 29, 2009
 Blooming yellow wood sorrel (shamrock, Oxalis dillenii?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 13, 2012
 Yellow flower of wood sorrel (shamrock, Oxalis dillenii?) on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, October 13, 2012
 Mountain mint (Pycnanthemum tenuifolium) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Violet woodsorrel (Oxalis violacea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Section of a false truffle (Rhizopogon) with a parasitic fungus Hypomyces chrysospermus in ultraviolet light from Richards Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 6, 2024
 Fallen fruits of trifoliate orange (Poncirus trifoliata) with citrus blue mold fungus Penicillium italicum both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest north from Montgomery. Texas, October 10, 2024
 Leaves of violet woodsorrel (Oxalis violacea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Underside of a leaf of violet woodsorrel (Oxalis violacea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Carpet of leaves of violet woodsorrel (Oxalis violacea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Pattern of leaves of violet woodsorrel (Oxalis violacea) on Lone Star Hiking Trail near Pole Creek in Sam Houston National Forest. Richards, Texas, March 1, 2019
 Dissected dyeball mushroom (Pisolithus arhizus) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Greenway Trail. College Station, Texas, September 19, 2024
 Pink wood sorrel (shamrock, Oxalis violacea?) in Mercer Arboretum and Botanical Gardens. Humble (Houston area), Texas, February 8, 2009
 Section of fruit of pomegranate both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Kroger supermarket. College Station, Texas, September 12, 2024
 Close-up of fruit of pomegranate both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Kroger supermarket. College Station, Texas, September 12, 2024
 Pencil flower (Stylosanthes biflora) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Orange milkweed (Asclepias tuberosa) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Wild petunia (Ruellia caroliniensis(?)) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Mountain mint (Pycnanthemum tenuifolium) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Tiny purple flower of Violet wood sorrel (shamrock, Oxalis) on Deer Run Trail in Lick Creek Park. College Station, Texas, September 30, 2008
 Flower of powderpuff (Mimosa strigillosa) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Bee Creek Park. College Station, Texas, September 23, 2024
 St. Andrew cross (Hypericum, Ascyrum hypericoides) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Southern prairie aster (Eurybia hemispherica)(?) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Purple gerardia (Agalinis purpurea) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Flowers of frostweed (Verbesina virginica) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Buffalo gourd both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024
 Sweet everlasting (Pseudognaphalium obtusifolium, cudweed, Gnaphalium) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Richards Loop Trail in Sam Houston National Forest. Texas, September 21, 2024
 Pore surface of turkeytail mushrooms (Trametes versicolor) in ultraviolet light from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Mushrooms Gerronema strombodes when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 7, 2024
 Salt-marsh fleabane (Pluchea odorata) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Water primrose (Ludwigia) with flower buds both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Flowers of bastard pennyroyal (Trichostema dichotomum) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 17, 2024
 Dissected buffalo gourd both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024
 Close-up of narrowleaf marsh elder (Iva angustifolia) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Grass leaves in ultraviolet light on Richards Loop Trail in Sam Houston National Forest. Texas, October 5, 2024
 Young leaf of mustang grape (Vitis mustangensis) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Blooming salt-marsh fleabane (Pluchea odorata) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Flowers of cocklebur (Xanthium strumarium) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Birch Creek Unit of Somerville Lake State Park. Texas, September 14, 2024
 Flowers of smartweed (Persicaria, Polygonum) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Nails Creek Unit of Somerville Lake State Park. Texas, September 22, 2024
 Elegant gayfeather (pinkscale, Liatris hesperelegans, former L. elegans) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 17, 2024
 Annual broomweed both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Greenway Trail. College Station, Texas, October 18, 2024
 Acorns from oaks both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Greenway Trail. College Station, Texas, October 18, 2024
 Cross section of a young Amanita mushroom when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Caps of turkeytail mushrooms (Trametes versicolor) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Underside of polypore mushrooms Nigroporus vinosus when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 7, 2024
 Top view of polypore mushrooms Nigroporus vinosus when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 7, 2024
 Gills of tiny white Marasmius-like mushrooms when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Pore surface of mushrooms Nigroporus vinosus when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 7, 2024
 Leaf of an aquatic plant in ultraviolet light from Richards Loop Trail in Sam Houston National Forest. Texas, October 27, 2024
 Close-up of fluffy seeds of wand blackroot (Pterocaulon virgatum) both in natural light and under 365 nm ultraviolet (UV-A) blacklight from Lick Creek Park. College Station, Texas, September 11, 2024
 Tiny white Marasmius-like gilled mushrooms on a twig when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Caps of ochre bracket mushrooms (Trametes ochracea) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Top and underside surfaces of turkeytail mushrooms (Trametes versicolor) when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight from Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
 Underside of ochre bracket mushrooms (Trametes ochracea) on a log when exposed to regular daylight as well as when illuminated by a 365 nm ultraviolet (UV-A) blacklight on Sand Branch Loop Trail in Sam Houston National Forest near Montgomery. Texas, September 2, 2024
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