Amanita porphyria

Amanita porphyria, also known as the grey veiled amanita, is a fairly common, inedible mushroom of the genus "Amanita" found in Europe and North America.
Description.
"A. porphyria" is similar in overall shape and smell to the very common "Amanita citrina", but the cap colour is different and the ring has a grey/violet coloration.
The smooth cap is hemispherical when young and later flat, sometimes with grey patches of veil. It is about 4–10 cm in diameter, and brown with either a purplish or a greyish hue. The name "porphyria" refers to the purple tint.
As normal in the genus "Amanita", the gills are white and free from the stem and the spores are white.
The stem is 5–12 cm high and 0.6–1.5 cm thick, with a basal bulb which may or may not be surrounded by a white membranous volva. The fragile ring is grey-violet or blackened.
The flesh is white with a smell of raw potato or radish.
The amyloid spores are almost spherical with a diameter of 8–10 µm.
Distribution, habitat, ecology and human impact.
"A. porphyria" usually grows on poor soil under coniferous trees, especially spruce, but also fir, hemlock, and some deciduous ones such as birch. It is mycorrhizal, living in symbiosis with the trees.
It occurs from summer to autumn and is commoner in mountains or further to the north. In Europe it is very common in boreal or hemiboreal forests but less so in temperate areas. It is also found in northern North America from east to west. There has been some uncertainty whether the North American "version" should really be classified under a different name, but there is now firm DNA evidence that all the variants actually belong to the same species. It has also been recorded in Australia.
"A. porphyria" is not suitable for consumption. More importantly, it can easily be confused with much more poisonous species, such as the Panther cap ("Amanita pantherina").
Naming.
This fungus was described in 1805 under the current name, "Amanita porphyria", by Johannes Baptista von Albertini and Lewis David de Schweinitz in their work "Conspectus Fungorum in Lusatiae superioris agro Niskiensi crescentium e methodo Persooniana" ("An overview of fungi growing in the area of Niesky in Upper Lusatia, according to the methodology of Persoon"). The name was then sanctioned by Fries, meaning that the name "Amanita porphyria" is given priority even if the normal nomenclatural rules would give precedence to another nameand indeed the Danish mycologist Heinrich Christian Friedrich Schumacher had already described the same species as "Agaricus gracilis" in 1803. The sanctioning can be shown in the author string by means of a colon as in the following: ""A. porphyria" Alb. & Schwein. : Fr."
The epithet "porphyria" comes from the Ancient Greek word porphúra (πορφύρα), meaning the Tyrian purple dye. This colour may be seen in the cap of the mushroom (though it is not always evident).