Suillus cavipes
Cavus Boletus ( Suillus cavipes )
The cavus Boletus ( Suillus cavipes, syn. Boletinus cavipes ) is a mushroom of the family of Schmierröhrlingsverwandten. The former taxonomic assignment to the genus shed boletes ( Boletinus ) is considered obsolete.
- 4.1 hazard
- 6.1 Literature
Features
Macroscopic characteristics
The centrally stalked hat has a first flat convex shape, but flattens out soon. At the age he can be recessed a bit and has a blunt hump. The hat reached a size of 5 to 15 centimeters. The ranges in color from dark yellow to orange to chestnut brown, but can also be tinted lemon to golden yellow. He is only closed. The hat skin is not greasy and torn during growth on a slightly protruding scales. The brim is often festooned with Velumresten that has obscured the tubes in the young mushroom. The tubes are pale sulfur- colored to olive yellow and considerably shorter than the thickness of Hutfleisches. They run on a stick down a bit and are not easy to remove. The pores are about the same as the colored tubes and have an elongated form in a radiating arrangement. You can become very large ( about 1 centimeter ). The spore powder is olive brown. The handle is cylindrical to slightly club-shaped form and is very early hollow. He has a wattige, whitish ring zone. Furthermore he is about how the tubes yellowish and including colored like the Hutoberseite and somewhat scaly - tomentose. The Myzelstränge at the base are whitish. The Trama is pale yellow to almost white. In the base, it may be a bit brownish from the outside. With ferrous sulfate, the Trama greenish gray in color. The meat tastes mild and is odorless.
Microscopic characteristics
The basidia measure 20 to 35 to 7 to 12 microns. The bulbous - spindled or approximately cylindrical cystidia are 40 to 80, a maximum of 100 to 5 to 10 microns in size. The elongated spindle-shaped spores are 7-11 microns long and 3-4 microns wide.
Artabgrenzung
The cavus Boletus is well characterized by its fast hollow stem, the Velumreste and the scaly - felted hat. Other ringed boletes under larches from the kind of lubrication boletes as the Auburn larch boletus ( Suillus tridentinus ) or the gray larch boletus ( Suillus viscidus ) have a greasy hat skin and a meaty stick.
Ecology
The cavus Boletus can live in all types of forest, but he prefers older stands. In young forests it can be found much less frequently. The fungus is found exclusively among larches, with whom he forms a mycorrhiza. Even compared to the pH value of the soil he is indifferent; strongly calcareous soils avoids the fungus, however, and tends to be acidic substrates. The shape aereus is only found there. The fruiting bodies appear in late August to October rare or previously in November.
Dissemination
The cavus Boletus diffused across the Holarctic, where it occurs submeridional - temperat. It can be found in North America, Europe, Siberia, Japan, China and Korea. In Europe it is out in the Mediterranean spread everywhere and most often. He follows in its disseminating the occurrence of larch trees, but it is often only in the natural forests; in artificially planted held by the fungus is much rarer. The fungus is locally fairly common, especially in middle and high mountains, it is rare, especially in low-lying regions. In many areas, the fungus was probably introduced with plantations of larch as a forest tree.
Endangering
Since the hollow foot Boletus is bound to larches, its occurrence depends on the range of these trees. However, it is forestry is no longer of great importance. Therefore it is expected that the stocks of Röhrlings go back in the near future. So far inclusion in the Red List is not required.
System
Some authors distinguish some forms because of the cavus Boletus in his hat color is highly variable. The shape aereus has a hat with lemon, chrome -or gold- yellow color. It also only occurs on acidic soils. Other forms, such as f or f aurantiacus ferrugineus are after Krieglsteiner et al. unjustified.