Bog birch mushroom
| Bog birch mushroom | ||||||||||||
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Bog birch mushroom ( Leccinum holopus ) |
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Leccinum holopus | ||||||||||||
| ( Rostk. ) Watling |
The bog birch mushroom ( Leccinum holopus ) is a type of mushroom from the family of the thick boletus relatives . It is rare in Central Europe and occurs mainly in moors and wetlands .
features
Macroscopic features
The hemispherical, later cushion-shaped and finally flat hat measures 3–7 cm in width. It has a whitish-cream to greenish or bluish color. The hat skin is finely velvety, but smeary in damp weather. The 5–12 mm long tubes on the underside of the hat are bulged around the stem and have the same color as the hat. The tube mouths or pores turn out to be relatively small at 0.5–1 mm. The spore powder is cinnamon brown. The club-shaped, 5–7 (–10) cm long and up to 2 cm thick stalk has a white to grayish color and turns greenish on pressure. With age, pale brown scales form on the stem bark. The initially soft meat becomes softer with age. It is white and has pale greenish tones, in the cut it turns green. The smell is inconspicuous, the taste is mild to sour.
The meat reacts to iron (II) sulfate with a gray-green color. With formalin initially it shows no reaction, but changes color after 1-2 minutes flesh-colored pink.
Microscopic features
The spores measure 15-21 x 5-7 micrometers.
Species delimitation
The white birch mushroom ( Leccinum albellum ) looks similar, but can be found in oak forests on dry ground.
Ecology and diffusion
The bog birch fungus forms mycorrhiza with birch trees , and is dependent on moist soil. Moors therefore offer ideal habitats, although they have been in decline in Central Europe in recent decades. This is one of the reasons why the bog birch mushroom is very rare in Germany, Austria and Switzerland and worth protecting. In North America it can be found from Alaska to Michigan , the range here apparently coincides with that of the paper birch ( Betula papyrifera ). The mushroom can be found between June and October.
Systematics
The following varieties have been described for the bog birch mushroom :
- Leccinum holopus var. Americanum AH Sm. & Thiers 1971 (= Leccinum holopus)
- Leccinum holopus var. Holopus (Rostk.) Watling 1960
- Leccinum holopus var. Majus (Singer) Singer 1966
- Leccinum holopus var. Nucatum (Lannoy & Estadès) Klofac 2007 (= Leccinum holopus)
meaning
The bog birch mushroom is a mediocre edible mushroom that can be used young, especially as a mixed mushroom. In view of its rarity in some areas, however, one should consider whether the food value justifies picking the mushroom.
swell
- ↑ a b Hans E. Laux: Edible mushrooms and their poisonous doppelgangers . Kosmos, Stuttgart 1985, p. 34 .
- ↑ Leccinum holopus . (No longer available online.) In: pilzlexikon.eu . Archived from the original on July 24, 2009 ; Retrieved August 30, 2009 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ a b c Michael Kuo: Leccinum holopus . In: MushroomExpert.Com . April 2008, accessed August 30, 2009 .
- ↑ Leccinum holopus . In: Index Fungorum . Retrieved August 31, 2009 .
