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3615-12. Violet wood sorrel (Oxalis violacea) 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

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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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