Sidera lenis (Skeletocutis lenis) fungus (mushroom) covering a trunk of a broken pine tree in Sosnovka Park. Saint Petersburg, Russia, February 27, 2017
ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214Synonyms: Amyloporia lenis, Antrodia lenis, Antrodiella lenis, Cinereomyces lenis, Diplomitoporus lenis, Physisporus lenis, Polyporus bullosus, Polyporus chakasskensis, Poria bullosa, Poria calcea, Poria chakasskensis, Poria consimilis, Poria earlei, Poria lenis, Poria lunata, Poria lunulispora, Poria minutipora, Poria montana, Poria subvulgaris, Poria tenuipora, Skeletocutis lenis.
Russian name: Skeletokutis nezhnyy.
Sidera lenis is a rare fungus species in the family Repetobasidiaceae. It has been found in St. Petersburg and Leningrad Oblast, typically growing on decaying wood, particularly coniferous tree trunks and stumps. In north-western Russia, Sidera lenis tends to thrive in moist, shaded environments with rich organic matter. The fungus produces small, resinous, and odontioid basidiocarps, usually 1-5 mm in size, with a smooth to velvety surface and white to cream-colored spines.
Sidera lenis (Skeletocutis lenis) fungus (mushroom) covering a trunk of a broken pine tree in Sosnovka Park. Saint Petersburg, Russia, February 27, 2017ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
Dense white cover of Sidera lenis (Skeletocutis lenis) poroid fungus (mushroom) on a broken trunk of a pine tree in Sosnovka Park. Saint Petersburg, Russia, February 27, 2017ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
Close up of Sidera lenis (Skeletocutis lenis) tinder poroid fungus (mushroom) taken from a rotten pine tree in Sosnovka Park. Saint Petersburg, Russia, February 27, 2017pr. Raevskogo, 24, Sankt-Peterburg, Russia, 194064
Texture of Sidera lenis (Skeletocutis lenis) tinder fungus (mushroom) taken from a rotten pine tree in Sosnovka Park. Saint Petersburg, Russia, February 27, 2017pr. Raevskogo, 24, Sankt-Peterburg, Russia, 194064
Sidera lenis (Skeletocutis lenis)(?) poroid fungus on a broken pine tree in Sosnovka Park. Saint Petersburg, Russia, March 27, 2017ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
Spreading poroid fungus Sidera lenis (Skeletocutis lenis)(?) on a broken pine tree in Sosnovka Park. Saint Petersburg, Russia, March 27, 2017ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
White pores of poroid fungus Sidera lenis (Skeletocutis lenis)(?) on a broken pine tree in Sosnovka Park. Saint Petersburg, Russia, March 27, 2017ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
Sidera lenis (Skeletocutis lenis)(?) poroid fungus on rotten wood of a pine tree in Sosnovka Park. Saint Petersburg, Russia, March 27, 2017ul. Zhaka Dyuklo, 67, Sankt-Peterburg, Russia, 194214
Spreading poroid fungus Sidera lenis (Skeletocutis lenis)(?) on a spruce log near Shchuchye Lake in Komarovo, north-west from Saint Petersburg. Russia, April 28, 2017Ozyornaya ul., 45, Russia, 197733
Corticioid fungus Sidera lenis (Skeletocutis lenis)(?) on a spruce log near Shchuchye Lake in Komarovo, north-west from Saint Petersburg. Russia, April 28, 2017Ozyornaya ul., 45, Russia, 197733
Resupinate polypore mushroom Sidera lenis (Skeletocutis lenis)(?) on a fallen pine in wet area in Sosnovka Park. Saint Petersburg, Russia, May 8, 2021Unnamed Road, Sankt-Peterburg, Russia, 194064
Texture of resupinate polypore mushroom Sidera lenis (Skeletocutis lenis)(?) on a fallen pine in wet area in Sosnovka Park. Saint Petersburg, Russia, May 8, 2021Unnamed Road, Sankt-Peterburg, Russia, 194064
Close-up of resupinate polypore mushroom Sidera lenis (Skeletocutis lenis)(?) on a fallen pine in wet area in Sosnovka Park. Saint Petersburg, Russia, May 8, 2021Unnamed Road, Sankt-Peterburg, Russia, 194064
White resupinate polypore mushroom Sidera lenis (Skeletocutis lenis)(?) on a dry pine in Sosnovka Park. Saint Petersburg, Russia, July 30, 2024Лиственная аллея, округ Сосновское, Санкт-Петербург, Северо-Западный федеральный округ, 194291, РоссияObservations of the fungus Sidera lenis in Leningrad Oblast and north-western Russia reveal its growth patterns and habitats. The fungus was found covering trunks of broken pine trees, forming a dense white cover with poroid structures. It was also observed on rotten wood and spruce logs, spreading and forming corticioid and resupinate polypore shapes. The texture of the fungus varied, with white pores and a smooth surface. Observations were made in Sosnovka Park, Saint Petersburg, and near Shchuchye Lake in Komarovo, with the fungus growing in both wet and dry areas. The fungus was found on fallen pines, spruce logs, and dry pine trees, indicating its ability to adapt to different environments. The observations spanned several years, from 2017 to 2024, providing a comprehensive understanding of the fungus's growth and distribution in the region.
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