Russula aeruginea

Grass Green Russula ( Russula aeruginea )

The Grass Green Russula ( Russula aeruginea, Syn: Russula graminicolor ), also known as Green Grass Birch Russula, is a fungus of the family of Täublingsverwandten. The quite common mushroom has a light green to gray- green, shiny wet hat and cream-colored, light -tasting schärflich fins. It is edible and typically grows under birch trees.

• 5.1 Infra Generic Systematics
• 5.2 forms and varieties

• 7.1 Notes and references

Features

Macroscopic characteristics

The name " Grass Green Täubling " derives from the color of the hat on the top side. This is light green, sometimes colored light gray and fitted with a sticky surface. Often the center of the hat is darker than its surroundings. In the initial stage of the hat is spherically closed and downward. Later, the hat expands and takes on a wavy shape, with most forms a depression in the center of the hat. At the brim are in large specimens grooves. Average can reach a diameter 5 to 12 centimeters, a hat.

There are cream-colored slats, which are fairly close and are often forked at the bottom of the hat. In older specimens they are often mottled brownish.

The white stem is smooth and about 4-8 inches long. This is also uniformly thick. At run him down at the top of the slats.

The white meat is crumbly and brittle, it is odorless and has a mild, slightly sharp taste. With ferrous sulphate it turns gray-pink and reacts only slowly and weakly with guaiac. The spore powder of Russula aeruginea also has a cream color ( IIb -IIc after Romagnesi ).

The hat skin turns orange with KOH. Ferrous sulfate discolored meat or the stem surface slowly rose.

Microscopic characteristics

The spores of the green grass Täublings are very variable in size. They are between 6-10 microns long and 5-7 microns wide. They are elliptic or oblong significantly, in exceptional cases, they may even be kidney-shaped. The papilosen, rounded warts are partially connected by fine lines and form, in rare cases, a partial network with up to two stitches out. The warts are about 0.5-0.6 microns high, rarely more. The basidia are 38-45 long and 6.5-8 microns wide.

The Huthauthyphen contain rectangular, not inflated supporting cells. The cystidia are 50-82 microns long and 7.5-12 microns wide, cylindrical to spindle -shaped and without septa. The Pilozystiden are dyeable with Sulfovanillin.

Artabgrenzung

The most important characteristics of this fungus are: location among birches, dull greenish to gray hat and splintering, ocher-colored slats. There are a number of Täublingen who can see the grass green Täubling very similar.

• Especially similar are some forms of blue-green icing Russula ( Russula parazurea ). The blue-green icing Täubling has a grauweißlich frosted hat, more whitish (pale cream ) fins and a pale cream-colored powder spores at least in the dry.
• Also green forms of Frauentäublings ( Russula cyanxantha ) may look similar. But the cyanoxantha has elastic, non- splintering slats. In addition, his flesh does not react with iron sulfate.
• The Green Speisetäubling and green forms of meat Red Speisetäublings ( Russula vesca ) have white fins and a pure white spore powder.

Ecology

Like all russulas, even the grass Green Russula is a Mykorrhizabildner, main partners are species of the genus of the birches, especially silver birch and downy birch ( hence the alternative name Grass Green Birch Russula ), rare spruce. In addition, rare reports of findings under pines, linden, larch and hemlock. The Grass Green Russula is not tied to any particular forest type and can be found at various locations in the grass under its host trees. In addition he also inhabited forests parks, gardens and cemeteries. Preference is given to very dry to fresh, sour ( lime free to strongly decalcified ), nutrient-poor soils. The species occurs from lowlands to high mountains before. The fruiting bodies appear in central Europe from July to October. The species is sensitive to nutrient inputs and liming of forests. It is (still common, but significant decrease tendency) for Baden -Württemberg in the risk group G3 placed.

Dissemination

The grass is green Täubling throughout the Holarctic North America (Canada, USA ), Africa (Morocco ), Asia ( South-North Korea, Kamchatka, Japan ) and Europe spread. South of Israel, Asia Minor, the Canary Islands and the Balearic Islands to the north to Greenland, Iceland, the Hebrides and Lapland.

In Germany it is spread relatively evenly throughout, but avoids the limestone areas.

System

Infra Generic Systematics

The Green Grass Täubling provided by M. Bon in the sub-section Griseinae, a subsection of the section Heterophyllea. The lower section contains medium to large species with gray, green, purple or olive green hat. The mild se -tasting mushrooms have slightly schärfliche lamellae, their spore powder is off-white to ocher.

Forms and varieties

The following forms and varieties have been described:

Importance

The Grass Green Russula is edible, but unpalatable raw and should be well boiled or fried.

Swell

• Ettore Bielli: mushrooms. New Kaiser Verlag, Klagenfurt 1998, ISBN 3-7043-2179-6. ( ital.Originaltitel: Funghi )
• Catherine Bickerich -Stoll: Mushrooms determined with certainty. Publisher of popular scientific literature, Leipzig 1980. (1990, ISBN 3-332-00144-2 )
• GJ Krieglsteiner: The Great Mushrooms of Baden-Württemberg. Volume 2 Eugen Ulmer Verlag, Stuttgart 2000, ISBN 3-8001-3531-0.