Synonyms: Boletus albidus, Boletus amarus, Boletus candicans, Boletus constrictus, Boletus pachypus, Boletus radicans, Boletus sanguineipes, Boletus subtomentosus, Boletus vitellinus, Dictyopus amarus, Dictyopus pachypus, Suillus amarus, Suillus radicans, Versipellis radicans.
Common name: rooting bolete.
Russian names: Borovik korenyashchiysya, Borovik korenastyy, Bolet glubokoukorenyaiushchiysya, Borovik belovatyy, Borovik gorkiy gubchatyy, Borovik ukorenyaiushchiysya, Bolet gorkiy gubchatyy.
Extract from Wikipedia article: Caloboletus radicans, also known as the rooting bolete or whitish bolete, is a large, rare ectomycorrhizal fungus found in Europe under deciduous trees in summer and autumn. It has a pale buff or white cap, yellow pores and a stout stipe, and stains blue when bruised or cut. Bitter and inedible, it can cause severe vomiting and diarrhoea when eaten. Until 2014 it was known as Boletus radicans.
Caloboletus radicans is a rare and poorly known fungus found in northern Europe. In St. Petersburg and Leningrad Oblast, it typically grows in coniferous forests, often associated with pine trees. Records from north-western Russia indicate that the species prefers acidic soils and can be found fruiting from late summer to early autumn. The fungus has a brown cap and yellowish pores, with a radicating mycelium that distinguishes it from other boletes. Collections in the region are scarce, but available data suggest that Caloboletus radicans is a locally rare and potentially endangered species in north-western Russia.
Rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017
Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) reminiscent large stones on a lawn near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) reminiscent large stones on a lawn near Dvortsovaya Street with a cut mushroom staining blue in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Cross section of bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn near Kukhonny Pond in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn under maple and linden trees near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Blue staining rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn under maple and linden trees near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Pale buff caps of rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn under maple and linden trees near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn under maple and linden trees near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) reminding stones on a lawn near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601
Dissected blue stained cap of rooting bolete mushrooms (Caloboletus radicans, Boletus radicans) on a lawn near Dvortsovaya Street in Alexander Park in Pushkin, former Tsarskoe Selo, near Saint Petersburg. Russia, September 7, 2017Dvortsovaya ul., 23, Pushkin, Sankt-Peterburg, Russia, 196601In Leningrad Oblast and north-western Russia, observations of Caloboletus radicans were made on lawns in Alexander Park, Pushkin, near Saint Petersburg. The mushrooms were found growing under maple and linden trees, resembling large stones due to their shape and color. When cut, the mushrooms stained blue, a distinctive characteristic of the species. The caps were pale buff in color and the cross-section of the mushrooms showed a typical bolete structure. Multiple observations were made on September 7, 2017, with photographs taken near Dvortsovaya Street and Kukhonny Pond. The mushrooms were abundant in the area, with some specimens showing blue staining on the cap and others having a more stone-like appearance. Overall, the observations highlight the presence of Caloboletus radicans in this region of Russia.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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