Rooting bitter boletus
| Rooting bitter boletus | ||||||||||||
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Bitter boletus ( Caloboletus radicans ) with roots |
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| Caloboletus radicans | ||||||||||||
| ( Pers .: Fr. ) Vizzini |
The rooting bitter boletus or bitter sponge ( Caloboletus radicans , syn. Boletus radicans , B. albidus ) is a type of fungus from the family of the thick boletus relatives (Boletaceae).
features
Macroscopic features
The hat has a diameter of 6–20, occasionally up to 30 cm. Old specimens have a dirty yellow-brown, young fruiting bodies , however, a pale gray-white color. Initially hemispherical, the hat bulges with age and finally flattens out. The skin is not removable and protrudes at the edge. When young, it has a fine felted surface that later becomes bald. Pressure points turn green-blue, later they fade to brownish. Even the tubes immediately turn a dirty blue when they are touched a little. Untouched, the tube mouths appear lemon-yellow to golden-yellow, with age also olive. The tube layer is 1–4 mm thick. The spore powder is olive brown in color. The massive stem first shows a spherical shape and then extends into a bulbous, club-shaped to top-shaped shape. It becomes 5–12 cm high and up to 7 cm thick. When young it has a light yellow color which later turns brownish-yellow. The stem bark is covered with a very indistinct, yellowish-brownish network. The meat is firm and later soft, white to light yellow and immediately bluish in the air. It smells sour and tastes bitter to varying degrees.
Microscopic features
The spores measure 10-16 x 4-6 microns.
Species delimitation
The rooting bitter boletus resembles the Schönfuß bolete ( Caloboletus calopus ), but it has a clearly red colored, reticulated stem and grows on acidic soils and also in coniferous forests. Its meat also tastes bitter, but only faintly blue. There is also a similarity to the rare silver boletus ( Butyriboletus fechtneri ).
ecology
The rooting bitter bolete occurs in deciduous forests in Europe and requires soils rich in lime. It is a mycorrhizal fungus that can be found especially in company with oaks, but also with beeches, birches, linden and hornbeams. It often appears from July to September as a large single fruiting body, sometimes quite numerous. The population of this heat-loving species seems to be increasing in Central Europe as a result of global warming .
Systematics
In 1801 the rooting bitter boletus was first described by the South African born mycologist Christian Hendrik Persoon .
meaning
Origin of name
The Latin epithet "radicans" of the two-part, scientific name means something like "rooting" (radix = root). Later the synonymous name "Boletus albidus" was added.
Food value
The mushroom is not recommended for consumption because of its sour smell and bitter taste, although it has no toxic effects.
swell
literature
- Markus Flück: Which mushroom is that? 3. Edition. Franckh-Kosmos Verlags-GmbH & Co. KG, Stuttgart 2009, ISBN 978-3-440-11561-9 , p. 123 .
- Hans E. Laux: The great cosmos mushroom guide. All edible mushrooms with their poisonous doppelgangers. Franckh-Kosmos, Stuttgart 2001, ISBN 3-440-08457-4 , p. 78.
Individual evidence
- ^ Alfredo Vizzini: Index Fungorum no.146. May 10, 2014, accessed on January 21, 2014 .
- ^ Roger Phillips: Mushrooms . Pan MacMillan, London 2006, ISBN 978-0-330-44237-4 , pp. 278 .
