 Soft porous fungus covering rotten birch bark in Sosnovka Park. Saint Petersburg, Russia, September 2, 2017
 Prostrate form of purple toothed polypore fungus (Trichaptum biforme) covering a birch log in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Autumn leaves covering a road in Monrepo (Mon Repos) Park. Vyborg, north from Saint Petersburg, Russia, October 7, 2016
 Young leaves on a birch in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Birch alley with maple leaves in Sosnovka Park. Saint Petersburg, Russia, October 20, 2016
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Birch forest in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Alley with yellow leaves in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Coral slime mold Ceratiomyxa fruticulosa var. porioides among dry birch leaves in Sosnovka Park. Saint Petersburg, Russia, June 30, 2017
 Birch and maple trees in Sosnovka Park. Saint Petersburg, Russia, October 3, 2017
 Fall colors of birch alley in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Birch trees in northern part of Sosnovka Park. Saint Petersburg, Russia, October 3, 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
 Fungus (mushroom) Cylindrobasidium evolvens growing on fallen birch leaves taken from peat area in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Fungus (mushroom) Cylindrobasidium evolvens growing on fallen birch leaves on peat in swampy area of Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Fall colors of birch alley in north area in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Orange leaves on demolished garages in area of former prisoner of war camps in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Yellow leaves on demolished garages in area of former prisoner of war camps in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Yellow leaves carpeting demolished garages in area of former prisoner of war camps in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Sidera lenis (Skeletocutis lenis) fungus (mushroom) covering a trunk of a broken pine tree in Sosnovka Park. Saint Petersburg, Russia, February 27, 2017
 Road in a birch forest in Sosnovka Park. Saint Petersburg, Russia, May 17, 2011
 Road through birch forest in Sosnovka Park. Saint Petersburg, Russia, May 17, 2011
 Some young leaves in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Road with birch trees in Sosnovka Park. Saint Petersburg, Russia, September 29, 2015
 Road through birch forest in Sosnovka Park. Saint Petersburg, Russia, September 29, 2015
 Maple leaves covering ground in Botanic Gardens of Komarov Botanical Institute. Saint Petersburg, Russia, October 20, 2016
 Birch trees 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, April 22, 2017
 Birch trees in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Maple leaves in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016
 Road in birch forest in fresh snow in Sosnovka Park. Saint Petersburg, Russia, November 25, 2016
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 Birch trees in Sosnovka Park. Saint Petersburg, Russia, October 25, 2016
 Birch trees in Sosnovka Park. Saint Petersburg, Russia, October 20, 2016
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 25, 2016
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 20, 2016
 Birch alley in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016
 Birch trees at snowfall in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch alley with snow in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch trees with snow in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Birch forest with snow in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Leaves in a pool of water in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016
 Frozen maple leaves in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 Snow on yellow leaves in Sosnovka Park. Saint Petersburg, Russia, October 25, 2016
 Yellow maple leaves in Sosnovka Park. Saint Petersburg, Russia, October 20, 2016
 Corticioid fungus Hyphodontia abieticola(?) covering a completely rotten log in lower Sergievka Park. Old Peterhof, west from Saint Petersburg, Russia, October 5, 2017
 Corticioid fungus on birch tree in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Mushrooms Panellus ringens on a birch in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Tar rot on maple leaves (Rhytisma acerinum) in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016
 Fungus Hypomyces armeniacus on rotting leaves in Sosnovka Park. Saint Petersburg, Russia, August 14, 2017
 Birch alley in swampy area in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 Snowy road in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Road at snowfall in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 Road and pines in Sosnovka Park. Saint Petersburg, Russia, April 22, 2017
 A road near a shooting range in Sosnovka Park. Saint Petersburg, Russia, May 11, 2017
 Some crustous fibrillous fungus on a birch tree in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017
 Antrodiella or may be Trametes mushrooms on a fallen birch in Sosnovka Park. Saint Petersburg, Russia, June 25, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, September 16, 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, June 22, 2017
 Some crustous fungus at the base of a birch tree in Sosnovka Park. Saint Petersburg, Russia, September 13, 2017
 Timber mushrooms Lentinellus castoreus on a birch log in Sosnovka Park. Saint Petersburg, Russia, September 2, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, June 30, 2017
 Slime mold Fuligo leviderma on a birch in Sosnovka Park. Saint Petersburg, Russia, March 13, 2017
 Timber mushrooms Pycnoporellus fulgens on a birch log in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017
 Tar rot fungus (Rhytisma acerinum) on fallen maple leaves in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Tar rot fungus (Rhytisma acerinum) on last year maple leaves in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017
 Fungus Hypomyces armeniacus on rotting leaves on the ground in Sosnovka Park. Saint Petersburg, Russia, August 14, 2017
 Fresh leaves of mountain ash (Sorbus aucuparia, Russian name Ryabina) in Sosnovka Park. Saint Petersburg, Russia, May 20, 2017
 Some small white shield like mushrooms on rotten birch in Sosnovka Park. Saint Petersburg, Russia, April 4, 2017
 Texture of chaga (Inonotus obliquus) on a birch behind a shooting range in Sosnovka Park. Saint Petersburg, Russia, May 11, 2017
 Dog vomit slime mold (Fuligo septica) on a birch log in Sosnovka Park. Saint Petersburg, Russia, July 19, 2017
 Group of birch milkcap mushrooms (Lactarius tabidus) in Sosnovka Park. Saint Petersburg, Russia, September 16, 2017
 Caps of timber mushrooms Lentinellus castoreus on a birch log in Sosnovka Park. Saint Petersburg, Russia, September 2, 2017
 Brown birch bolete mushroom (Leccinum scabrum) in Sosnovka Park. Saint Petersburg, Russia, July 30, 2017
 Bonnet mushrooms (Mycena sp.) growing on small leaves taken from Sosnovka Park. Saint Petersburg, Russia, October 24, 2016
 Some white agaric mushroom (Amanita sp.) found under leaves in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 Rust fungus Puccinia urticata on leaves of common (stinging) nettle in Sosnovka Park. Saint Petersburg, Russia, May 27, 2017
 Hydnoid fungus Mycoacia aurea(?) on the underside of a rotten birch log in Sosnovka Park. Saint Petersburg, Russia, September 2, 2017
 Birch polypore mushroom Fomitopsis betulina (Piptoporus betulinus) in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Red velvety patches on a birch leaf (velvet erineum galls) in Sosnovka Park. Saint Petersburg, Russia, June 29, 2017
 Birch milkcap mushroom (Lactarius tabidus) in swampy part in Sosnovka Park. Saint Petersburg, Russia, June 29, 2017
 Birch milkcap mushrooms (Lactarius tabidus) in swampy area in Sosnovka Park. Saint Petersburg, Russia, July 6, 2017
 Birch milkcap mushrooms (Lactarius tabidus) on peat soil in Sosnovka Park. Saint Petersburg, Russia, June 22, 2017
 Purple toothed polypore mushrooms (Trichaptum biforme) on a birch log in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Red-Belt Conk (polypore mushroom Fomitopsis pinicola) on a birch in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Pores of Red-Belt Conk mushroom ( Fomitopsis pinicola) from a birch in Sosnovka Park. Saint Petersburg, Russia, March 20, 2017
 Red velvety patches on a birch leaf caused by the eriophyid mite in Sosnovka Park. Saint Petersburg, Russia, June 29, 2017
 Club foot mushrooms (Ampulloclitocybe clavipes) in a birch forest in Sosnovka Park. Saint Petersburg, Russia, September 16, 2017
 Tinder bracket mushrooms Pycnoporellus fulgens on birch logs in Sosnovka Park. Saint Petersburg, Russia, July 6, 2017
 Caps of artist s bracket mushrooms (Ganoderma applanatum) on a birch in Sosnovka Park. Saint Petersburg, Russia, August 4, 2017
 Tar rot fungus on fallen maple leaves, Rhytisma acerinum mushroom, in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
 An alley in Sosnovka Park. Saint Petersburg, Russia, October 8, 2017
 Warty cavalier mushrooms (Melanoleuca verrucipes) on a pile of rotten leaves in Sosnovka Park. Saint Petersburg, Russia, August 14, 2017
 Warty cavalier mushrooms (Melanoleuca verrucipes) on rotting pile of dry leaves in Sosnovka Park. Saint Petersburg, Russia, September 16, 2017
 Yellowing curtain crust mushrooms (Stereum subtomentosum) on a birch log in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016
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