A. regalis is classified in a section of Amanita within the genus, a grouping of related Amanitas that have a ring on the stem (or remnants thereof), and a bulb at the base of it. Fungi Europaei 9: 352. The most potent toxin present in these mushrooms is α-amanitin. Amanita's can also be used for dye extraction, making mushroom paper, and as fly bait if it is ground to a powder and suspended in a sticky gelatin matrix infused with insecticide. It is a North American form of the European edible Caesar's mushroom (Amanita caesarea); this mushroom is a good edible, delicious when fried in butter. This genus is responsible for approximately 95% of the fatalities resulting from mushroom poisoning, with the death cap accounting for about 50% on its own. The genus Amanita contains about 600 species of agarics, including some of the most toxic known mushrooms found worldwide, as well as some well-regarded edible species. Amanita regalis. Currently, the concentration of target compounds in Amanita biomass grown in liquid culture is only about 10-15% that of wild harvested Amanita's mushroom caps. Template:Multiple image Amanita regalis is easily distinguished from A. muscaria by the absence of any red color in the cap, and the yellow patches on the stem. This genus is responsible for approximately 95% of the fatalities resulting from mushroom poisoning, with the death cap accounting for about 50% on its own. Key differences from the fly agaric: ... Amanita regalis, but recent phylogenetic evidence has shown this assignment to be erroneous. The most potent toxin present in these mushrooms is α-amanitin. A. regalis is a cold-weather mushroom, occurring in the north or on mountains, in association with spruce. 2004. Amanita regalis—Neville & Poumarat. If it is a form that has a pale-colored, yellowish-brown cap, Amanita regalis may be confused with the blusher (Amanita rubescens, edible). Amanita regalis is another closely related species. It can be thought of as a dark brown, more toxic muscaria. [Note: This neotypification apparently assumed incorrectly that the (Michael 1903) plate of A. regalis was in the first edition of the same work and, consequently, designated a plate that does not illustrate A. regalis as the neotype of the species. The genus Amanita contains about 600 species of agarics, including some of the most toxic known mushrooms found worldwide, as well as some well-regarded edible species.