Suillus placidus
Ivory Boletus ( Suillus placidus )
The Ivory Boletus ( Suillus placidus ) is a relatively rare edible mushroom of the family of Schmierröhrlingsverwandten. He is a mycorrhizal fungus fünfnadeliger pine species.
- 6.1 Literature
- 6.2 Notes and references
Features
Macroscopic characteristics
The cap is initially hemispherical shaped to convex. Later he flattens and is often completely flat. He is four to eight, sometimes up to ten centimeters wide. The hat surface is slippery in wet weather, dry weather a bit sticky and glossy. In the juvenile stage it is off-white and later turns into yellowish to brownish yellow. The hat skin is removable.
The tubes are whitish and later cream to brownish yellow. They are four to ten millimeters long and slightly decurrent on stem. The pores are whitish young and later yellow to brownish. Especially young there are milky drops that dry up later or in case of drought.
The cylindrical stem is between two and six, sometimes ten inches long and may have up to two inches in diameter. It is often curved and generally pointed at the base. On a white to pale yellowish surface located along the entire length darker glands points. These are initially reddish, later darker brownish and some of it together. The Basalmycel is whitish.
The flesh is soft, whitish young and later yellowish. The smell is pleasant and the taste mild. The spore powder is yellow-olive.
Chemical reactions
The chemical reactions depend on the age of the fruiting body and the yellowing. With potassium hydroxide, the hat surface discolored pale pink to violettlich, later brownish. The meat turns more purple, especially on the yellow spots. With the ammonia reacts hat purple violet, the flesh purple, the pores salmon pink to reddish brown. On the Yellow discoloration arises in a salmon-colored meat and on the tubes an orange reaction a. With iron (II ) sulfate, the fruiting bodies react purple gray, yellow spots on blue-green.
Microscopic characteristics
The spores are breitspindelig to elliptical and about 7 to 10.5 times from 2.5 to 4.0 microns in size. The basidia have a slender club-shaped form and measure 20 to 30 times 5 to 7 microns. The cystidia are narrow fusiform to cylindrical and slightly clavate. They are 30 to 65 times 8 to 15 microns in size. They usually have slightly yellow tinted incrustations. Which consists of interwoven Hutdeckschicht lying hyphae, which are two to six microns wide.
Artabgrenzung
The Ivory Röhrling is characterized by its very bright colors with the white ivory also sport hats, the conspicuous glandular dots on the stem and the occurrence of under-five noble pines. Delineate are more difficult dunkelhütige copies.
The Ivory Röhrling was kept a long time for the ring lots of butter mushroom ( Suillus collinitus ). This generally has a darker, fibrous cap, yellowish pores, less conspicuous glandular dots on the stem, often a pink stem base and a pink Basalmycel and strong -colored flesh. It occurs also in other pine species.
Similarly, the occurring in the Alps pine Boletus (p. Plorans ) can be, which is exclusively bound to pineal pines. He has a yellow to orange- brown, fibrous hat and orange to olivbräunliche pores.
In southern Europe, it can occur together with the Kleinsporigen Pine Boletus (p. bellinii ), the young may also have whitish color. But he usually has even been brownish spots. He is also bound to two noble pine species.
Also suitable are the white form of butter fungus ( S. luteus f albus) with yellowish pores and the White Boletus (p. hololeucus ), which is probably bound to larches, and the Rosaporige Boletus (p. roseoporus ) with pink pores for confusion in question. In addition, these three extremely rare taxa have a ring and no yellow discoloration.
In North America, confusion with S. unicolor are possible. He is colored white and yellowish fleckt darker.
Ecology
The Ivory Boletus grows in many types of forests, in parks and similar habitats. He is strictly bound to five noble pine species such as the Weymouth or the pineal pine. The fungus preferably acidic soils. The fruiting bodies appear mainly in summer and autumn usually gregarious or sometimes tufted, rarely individually.
Dissemination
The Ivory Röhrling is mainly to be found in Europe in the circulation area of the pineal pine in the Alps, where he penetrates up to an altitude of 2100 meters. as well as in eastern North America found in the area of Weymouth pine. He is proven in Germany, France, Italy, Austria, Switzerland, Slovakia and Czech Republic. He was also found in Denmark, Sweden and the Netherlands. Furthermore, North Africa, China and Japan are given. Information in southern Europe under two noble pines result probably due to confusion with the Kleinsporigen Pine Boletus (p. bellinii ).
Importance
The Ivory Röhrling is edible, but should be spared because of its rarity.