 Red velvety patches on a birch leaf caused by the velvet erineum gall eriophyid mite in Sosnovka Park. Saint Petersburg, Russia, June 29, 2017
 Red velvety patches on a birch leaf caused by the eriophyid mite in Sosnovka Park. Saint Petersburg, Russia, June 29, 2017
 Red velvety patches on a birch leaf (velvet erineum galls) in Sosnovka Park. Saint Petersburg, Russia, June 29, 2017
 Persimmon leaf blister galls caused by bead gall mite Aceria theospyri on leaves of persimmon (Diospyros virginiana) on Richards Loop Trail in Sam Houston National Forest. Texas, May 26, 2022
 Fleshy gall on a cowberry leaf caused by the fungus Exobasidium vaccinii taken from Posiolok near Vyritsa, south from Saint Petersburg, Russia, July 9, 2017
 Galls (numerous pale green warts) on leaves of common ragweed (Ambrosia artemisiifolia) caused by eriophyid gall mites at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, July 30, 2021
 Puckered, irregular, wart-like galls on leaf surfaces of poison ivy produced by the eriophyid mite Aculops rhois (A. toxicophagus) in Bee Creek Park. College Station, Texas, June 10, 2019
 Reddish-green bladder galls on upper leaf surfaces of poison ivy produced by the eriophyid mite, Aculops rhois (A. toxicophagus, family Eriophyidae) in Bee Creek Park. College Station, Texas, June 10, 2019
 Irregular, wart-like light green to reddish-green bladder galls on leaf surfaces of poison ivy produced by leaf gall mite Aculops toxicophagus in Bee Creek Park. College Station, Texas, June 10, 2019
 Underside of a leaf with coltsfoot rust gall fungus, Puccinia poarum, in Sosnovka Park. Saint Petersburg, Russia, May 27, 2019
 Leaves of common ragweed (Ambrosia artemisiifolia) damaged by eriophyid gall mites at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 3, 2021
 Poison ivy leaf gall mite (irregular, wart-like light green to reddish-green bladder galls) in Bee Creek Park. College Station, Texas, June 10, 2019
 Leaves of common ragweed (Ambrosia artemisiifolia) with galls caused by eriophyid mites at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 3, 2021
 Galls caused by eriophyid mites on leaves of common ragweed (Ambrosia artemisiifolia) at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 3, 2021
 Distorted leaves of common ragweed (Ambrosia artemisiifolia) with galls caused by eriophyid mites at Lake Somerville Trailway near Birch Creek Unit of Somerville Lake State Park. Texas, August 3, 2021
 Patches of raspberry slime mold (Tubifera ferruginosa) on a log in Sosnovka Park. Saint Petersburg, Russia, June 30, 2017
 Leaf parachute mushrooms (Marasmius epiphyllus) on a rotten leaf of birch taken from Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 Some small velvet brown fibrecap mushrooms (Inocybe) in Sosnovka Park. Saint Petersburg, Russia, June 30, 2017
 Group of small velvet brown fibrecap mushrooms (Inocybe) in Sosnovka Park. Saint Petersburg, Russia, June 30, 2017
 Caps of artist s bracket mushrooms (Ganoderma applanatum) on a birch in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017
 Flat-topped goldenrod (Euthamia leptocephala) with leaf tar spots caused by gall midge Asteromyia euthamiae with a symbiotic fungus Botryosphaeria dothidea in Lick Creek Park. College Station, Texas, June 1, 2022
 Flat-topped goldenrod (Euthamia leptocephala) with leaf tar spots caused by gall midge Asteromyia euthamiae with a symbiotic fungus Botryosphaeria dothidea in Lick Creek Park. College Station, Texas, September 29, 2022
 Young purple toothed polypore mushrooms (Trichaptum biforme) on a birch log in Sosnovka Park. Saint Petersburg, Russia, August 14, 2017
 Gall on a stem of Solidago caused by a parasitic goldenrod gall fly Eurosta solidaginis on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Glasswort (Salsola imbricata) with fluffy growth caused by gall midges (gall gnats, Cecidomyidae) on rocky ridge of Jebel Fuwairit. Qatar, January 31, 2015
 Gall on a stem of Solidago caused by a parasitic goldenrod gall fly Eurosta solidaginis on Richards Loop Trail in Sam Houston National Forest. Texas, March 30, 2024
 Woolly growth on glasswort (Salsola imbricata) caused by gall midges (gall gnats, Cecidomyidae) taken from Purple Island (Jazirat Bin Ghanim). Al Khor, Qatar, May 29, 2015
 Gall-forming fungus Nodulisporium cecidiogenes on a fallen oak on a beach in Tarkhovka Park, west from Saint Petersburg. Russia, August 26, 2017
 Clumps of white hair caused by gall midges (gall gnats, Cecidomyidae) on glasswort Salsola imbricata on rocky ridge of Jebel Fuwairit. Qatar, January 31, 2015
 Glasswort (Salsola imbricata) with fluffy growth caused by gall midges (gall gnats, Cecidomyidae) in a village of Al Mashrab in area of Ras Laffan Farms. Northern Qatar, October 6, 2014
 Close up of gall-forming fungus Nodulisporium cecidiogenes on a fallen oak on a beach in Tarkhovka Park, west from Saint Petersburg. Russia, August 26, 2017
 Distorted leaves of common ragweed (Ambrosia artemisiifolia) with galls caused by eriophyid mites in David E. Schob Nature Preserve at 906 Ashburn Street. College Station, Texas, August 25, 2021
 Cinnamon bracket mushroom (Hapalopilus rutilans, Hapalopilus nidulans) on a birch log in Sosnovka Park. Saint Petersburg, Russia, August 14, 2017
 Glasswort Salsola imbricata with clumps of white hair caused by gall midges (gall gnats, Cecidomyidae) in a village of Al Mashrab in area of Ras Laffan Farms. Northern Qatar, October 6, 2014
 Velvety milk cap mushrooms (Lactarius lignyotus) near Oselki, north from Saint Petersburg. Russia, August 25, 2017
 Glasswort Salsola imbricata with dense growth of white hairs caused by gall midges (gall gnats, Cecidomyidae) in a village of Al Mashrab in area of Ras Laffan Farms. Northern Qatar, October 6, 2014
 Tar rot fungus (Rhytisma acerinum) on a maple leaf taken from Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Young leaf of mountain ash (Sorbus aucuparia, Russian name Ryabina) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Back lit leaf of mountain ash (Sorbus aucuparia, Russian name Ryabina) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Silver leaf fungus (Chondrostereum purpureum mushrooms) in Sosnovka Park. Saint Petersburg, Russia, March 13, 2017
 Black blotches on underside of the leaf of persimmon (Diospyros virginiana) caused by Cercospora leaf spot fungus Pseudocercospora diospyricola in Bee Creek Park. College Station, Texas, August 31, 2023
 Coltsfoot rust gall fungus, Puccinia poarum, in Sosnovka Park. Saint Petersburg, Russia, May 27, 2019
 Close up of a young leaf of mountain ash (Sorbus aucuparia, Russian name Ryabina) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Leaf parachute mushrooms (Marasmius epiphyllus) on a maple leaf taken from Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 Velvety milkcap mushrooms Lactarius lignyotus in area of Lembolovo - Orekhovo, 35 miles north from Saint Petersburg. Russia, August 8, 2017
 Velvet twiglet mushrooms (Simocybe sumptuosa) growing from cracks of bark on a birch log near Lisiy Nos. West from Saint Petersburg, Russia, August 26, 2018
 Birch forest in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Birch trees in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch trees in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Young leaves on a birch in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, April 16, 2017
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Birch trees at snowfall in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch and maple trees in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Birch trees with snow in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch alley with snow in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch forest with snow in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Gall (Woolly growth) on a dry oak leaf in Wolf Pen Creek Park. College Station, Texas, November 30, 2017
 Birch trees in northern part of Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Birch leaves covering a road in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Mushrooms Panellus ringens on a birch in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Corticioid fungus on birch tree in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Birch trees in northern part of Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Birch alley in north area in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Fall colors of birch alley in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Winter mushrooms (velvet foot, Flammulina velutipes) on a willow in Sosnovka Park. Saint Petersburg, Russia, November 23, 2016
 Group of winter mushrooms (velvet foot, Flammulina velutipes) in Sosnovka Park. Saint Petersburg, Russia, November 23, 2016
 Birch alley in eastern part of Sosnovka Park. Saint Petersburg, Russia, August 14, 2007
 Timber mushrooms Lentinellus castoreus on a birch log in Sosnovka Park. Saint Petersburg, Russia, September 2, 2017
 Slime mold Fuligo leviderma on a birch in Sosnovka Park. Saint Petersburg, Russia, March 13, 2017
 Antrodiella or may be Trametes mushrooms on a fallen birch in Sosnovka Park. Saint Petersburg, Russia, June 25, 2017
 Some crustous fibrillous fungus on a birch tree in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017
 Timber mushrooms Pycnoporellus fulgens on a birch log in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017
 Some crustous fungus at the base of a birch tree in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017
 Chaga (Inonotus obliquus) on a birch behind a shooting range in Sosnovka Park. Saint Petersburg, Russia, May 11, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, September 16, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, June 22, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, June 30, 2017
 Winter mushrooms (velvet foot, Flammulina velutipes) on a rotten stump in Sosnovka Park. Saint Petersburg, Russia, November 23, 2016
 Winter mushrooms (velvet foot, Flammulina velutipes) on a mossy stump in Sosnovka Park. Saint Petersburg, Russia, November 23, 2016
 Black blotches on the leaf of persimmon (Diospyros virginiana) caused by Cercospora leaf spot fungus Pseudocercospora diospyricola on Richards Loop Trail in Sam Houston National Forest. Texas, August 21, 2020
 Black blotches on the leaf of persimmon (Diospyros virginiana) caused by Cercospora leaf spot fungus Pseudocercospora diospyricola on Richards Loop Trail in Sam Houston National Forest. Texas, August 18, 2022
 Birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, August 25, 2016
 Some small white shield like mushrooms on rotten birch in Sosnovka Park. Saint Petersburg, Russia, April 4, 2017
 Brown birch bolete mushroom (Leccinum scabrum) in Sosnovka Park. Saint Petersburg, Russia, July 30, 2017
 Texture of chaga (Inonotus obliquus) on a birch behind a shooting range in Sosnovka Park. Saint Petersburg, Russia, May 11, 2017
 Group of birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, September 16, 2017
 Dog vomit slime mold (Fuligo septica) on a birch log in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017
 Caps of timber mushrooms Lentinellus castoreus on a birch log in Sosnovka Park. Saint Petersburg, Russia, September 2, 2017
 Fall colors of birch alley in north area in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Red-Belt Conk (polypore mushroom Fomitopsis pinicola) on a birch in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in swampy area in Sosnovka Park. Saint Petersburg, Russia, July 6, 2017
 Birch polypore mushroom Fomitopsis betulina (Piptoporus betulinus) in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Birch milkcap mushrooms (Lactarius tabidus) on peat soil in Sosnovka Park. Saint Petersburg, Russia, June 22, 2017
 Tinder bracket mushrooms Pycnoporellus fulgens on birch logs in Sosnovka Park. Saint Petersburg, Russia, July 6, 2017
 Pores of Red-Belt Conk mushroom ( Fomitopsis pinicola) from a birch in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Club foot mushrooms (Ampulloclitocybe clavipes) in a birch forest in Sosnovka Park. Saint Petersburg, Russia, September 16, 2017
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