Boletus torosus

Oxen Boletus (Boletus torosus )

The Ancient Boletus (Boletus torosus ) is a species of fungus in the family Dickröhrlingsverwandten ( Boletaceae ). Characteristic features are the intense dark blue discoloring meat, long lasting yellow pores and the strikingly high specific weight of the fruit body.

• 6.1 Literature
• 6.2 Notes and references

Features

Macroscopic characteristics

The hat is hemispherical so to cushion -shaped and flattened not even in old age. He reached a diameter between 10-20 (-25 ) cm. The dyeing may vary widely. First, it is usually tinted gold to ocher yellow or slightly greenish; yet he is often quite bright and pale. Soon he becomes reddish and blotchy black blue by external influences. Through a combination of all these sounds he can also look colorful. Soon, however, he is dirty. The surface is feinfilzig and verkahlt aged almost entirely.

The tubes are yellow with a Olivton. Under pressure they turn black blue. The pores are long dyed golden yellow. They later get an orange tone and orange only after a long time. However, at maturity, the red coloration loses again, so that the pores are re- tinted olive yellow. In case of contact they turn bright blue also.

The handle is bulbous shaped and reached a length of between 7-15 cm and a thickness of 2-6 cm. He is colored lemon yellow and is covered by a fine mesh. The base is usually already tinted dark young; soon carries the entire stem that color. The Basalmyzel is tinted pale yellowish white.

The flesh is yellow and discolored immediately strong greenish blue to blue- black in case of injury. After a few hours the sound fades and then turns reddish. Among the tubes ( tube bottom ) the flesh is yellowish. It tastes mild and has no particular smell.

Microscopic characteristics

The basidia measure 35-50 x 8-12 microns. The spores are spindle- shaped and 11-15 × 5-6 microns in size. The cystidia are bulbous to narrowly fusiform and 40-60 × 7-12 microns in size. The Hutdeckschicht consists of hyphae, the ends of which initially erected soon but are decumbent. These are 3-6 microns thick and cylindrical, pointed to weak.

Artabgrenzung

The Ancient Röhrling is characterized by its long lasting yellow pores and a strong blue flesh. Similar species like the Gelbhütige Purple Boletus (B. luteocupreus ) or the blue stain finish Purpurröhrling (B. rhodopurpureus ) already have very early reddish pores.

Ecology

The Ancient Röhrling is found in summer and autumn in deciduous forests and rarely in coniferous forests.

Dissemination

The Ancient Röhrling is spread in Europe mainly in the south. Among other things, in France it is more common. In the north, there are rare findings in England and southern Sweden. In Germany, the fungus is everywhere very rare.

Importance

The Ancient Röhrling is raw toxic, but can be consumed without damage by heating often. In France, where it grows abundantly among others in the West, he is a popular edible mushroom. In the fungal agent Coprin was detected, which is toxic in combination with alcohol. This would be the first detection of this substance outside the family of Tintlingsverwandten. However, the presence of this poison in the ox - Röhrling is doubted, since the fungus can be eaten without damage even with alcohol. In addition, symptoms and latency in appearance towards the Coprinus syndrome speak.

The fungus is often not well tolerated without alcohol. This is attributed to the heavy digestibility due to the compact flesh, presumably a high content of chitin and often large amounts recorded as observed in France often recycled. Symptoms may include abdominal cramps, even for small quantities; with luxuriant meals the occurrence of diarrhea and vomiting cases, possibly with mild hepatic involvement is possible. Therefore, it is generally discouraged the consumption of the Ox Röhrlings.

Swell