 Young wrinkled leaves of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Wrinkled young leaves of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Leaves of sassafras on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Red young leaves of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Spider on leaves of beautyberry on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Fresh green leaves of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Back lit leaves of sassafra on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Back lit leaves of willow oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young orange leaves of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Red young leaves of mustang grape on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young leaves and flowers of hawthorn on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Leaves of farkleberry (Vaccinium arboreum)(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Reddish young leaves and flowers of hawthorn on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Red leaves and flower buds of mustang grape on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young leaves of rattan vine (Berchemia scandens) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Fresh leaves of bracken fern (Pteridium aquilinum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young oak leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young red leaves of an oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Rosettes of cudweed (Gnaphalium spicatum) with silvery leaves on Road FS 203 near Richards Loop Trail in Sam Houston National Forest. Texas, February 18, 2023
 Young leaves of sweetgum on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of sassafras on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Shoot with glossy leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young reddish leaves of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Young leaves of sumac(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Some young glossy leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of sumac(?) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Tiny mushrooms Marasmius epiphyllus(?) on petioles and veins of rotting oak leaves on Richards Loop Trail in Sam Houston National Forest. Texas, September 17, 2023
 Shoot of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Winged elm on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young leaves of hickory on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Fresh leaves of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Young leaves of Virginia creeper on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Phylloxera galls on hickory leaves on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Some fresh leaves at Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2019
 Young leaves of elm on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Rusty shoot of oak on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Flowers of hawthorn on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Some rusty oak seedling on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Forest Service Road 203 on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young leaves of hawthorn at Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2019
 Fresh leaves of blackjack oak on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 8, 2020
 Young leaves of blackjack oak (Quercus marilandica) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Some young hairy leaves on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 29, 2009
 Pines near Forest Service Road 203 on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Rosette with smooth green leaves of smallhead doll s daisy (Boltonia diffusa) on Road FS 203 near Richards Loop Trail in Sam Houston National Forest. Texas, February 18, 2023
 Close-up of luna moth on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Fiddlehead of bracken fern on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Early blooming hawthorn on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Wrinkled loop lichen (Hypotrachyna livida) on tree bark on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest near Huntsville. Texas, March 2, 2019
 Patch of wrinkled loop lichen (Hypotrachyna livida) on a tree on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest near Huntsville. Texas, March 2, 2019
 Rock-rose on Forest Service Road 203 on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Young leaves of mustang grape (Vitis mustangensis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Hairy leaves of beaked hawkweed (Hieracium gronovii) on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Young red leaves of mustang grape on Little Lake Creek Loop Trail in Sam Houston National Forest. Richards, Texas, March 29, 2009
 Trilobed leaves of paper mulberry (Broussonetia papyrifera) on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Young leaves of Muscadine Grape (Vitis rotundifolia) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2020
 Green milkweed (Asclepias viridis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Carolina buckthorn (Frangula caroliniana) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Rattan vine (Berchemia scandens) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Malformed leaves of bracken fern (Pteridium aquilinum) on Road FS 203 near Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Greenbrier leaves with rust fungus Puccinia smilacis, collected on Richards Loop Trail in Sam Houston National Forest. Texas, March 9, 2022
 Blooming rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Fiddleheads of bracken fern (Pteridium aquilinum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Blooming rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Black swallowtail butterfly (Papilio polyxenes) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Shoot of bracken fern (Pteridium aquilinum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Underside of greenbrier leaves with rust fungus Puccinia smilacis, collected on Richards Loop Trail in Sam Houston National Forest. Texas, March 9, 2022
 Rust fungus Puccinia smilacis on greenbrier leaves under a microscope, collected on Richards Loop Trail in Sam Houston National Forest. Texas, March 9, 2022
 Irregularly grown leaves of bracken fern (Pteridium aquilinum) on Road FS 203 near on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Leaves of summer spiderlily (woodland spider-lily, Hymenocallis occidentalis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 21, 2021
 Yellow flower of rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Head of black swallowtail butterfly (Papilio polyxenes) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Uncurling leaf of bracken fern (Pteridium aquilinum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Yellow flower of rock-rose (Helianthemum carolinianum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Urediniospores of rust fungus Puccinia smilacis on greenbrier leaves under a microscope, collected on Richards Loop Trail in Sam Houston National Forest. Texas, March 9, 2022
 Urediniospores of rust fungus Puccinia smilacis on greenbrier leaves under a microscope, collected on Richards Loop Trail in Sam Houston National Forest. Texas, March 9, 2022
 Shoot of oak with red leaves on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 12, 2023
 Young red leaves of oak on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 12, 2023
 Leaves of littlehip hawthorn (Crataegus spathulata) with pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
 Pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) on leaves of littlehip hawthorn (Crataegus spathulata) on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
 Pattern of a young leaf of bracken fern (Pteridium aquilinum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Wrinkled loop lichen (Hypotrachyna livida) on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville. Texas, March 2, 2019
 Back lit young red leaves of oak on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 12, 2023
 Young leaves of sweetgum on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 12, 2023
 Young leaves of greenbrier (Smilax) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 4, 2023
 Close-up of a tail section of black swallowtail butterfly (Papilio polyxenes) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Wrinkled loop lichen (Hypotrachyna livida) on a tree on Caney Creek section of Lone Star Hiking Trail in Sam Houston National Forest near Huntsville. Texas, March 2, 2019
 Young leaves of jumpseed (knotweed, Persicaria virginiana) on Caney Creek Trail (Little Lake Creek Loop Trail) in Sam Houston National Forest north from Montgomery. Texas, March 4, 2023
 Rusty blackhaw viburnum (Viburnum rufidulum) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Pycnia of Juniper-hawthorn rust fungus (Gymnosporangium globosum) under a microscope in KOH, from upper surface of leaves of littlehip hawthorn (Crataegus spathulata), collected on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
 Underside of an orange mushroom Gliophorus psittacinus (Gliophorus perplexus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Viscid orange mushroom Gliophorus psittacinus (Gliophorus perplexus) on Richards Loop Trail in Sam Houston National Forest. Texas, March 18, 2023
 Tissues infected by Juniper-hawthorn rust fungus (Gymnosporangium globosum) under a microscope in KOH, from upper surface of leaves of littlehip hawthorn (Crataegus spathulata), collected on Richards Loop Trail in Sam Houston National Forest. Texas, July 23, 2023
 Orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on basal leaves of gayfeather (Liatris) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Basal leaves of gayfeather (Liatris) with orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Underside of basal leaves of gayfeather (Liatris) with orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Close-up of orange-yellow rust fungus Puccinia poarum (Puccinia liatridis) on basal leaves of gayfeather (Liatris) on Richards Loop Trail in Sam Houston National Forest. Texas, March 26, 2020
 Young leaves of oak on Richards Loop Trail in Sam Houston National Forest. Texas, April 9, 2022
|