Amanita jacksonii (Jackson's slender amanita)
North America
Cap 8–12 cm wide, stem 9-14 cm tall * 0.9-1.6 cm diameter
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Amanita jacksonii, also known as Jackson's slender amanita is a medium to large mushroom with a brilliant red or orange cap. It grows solitary or in small clumps on soil in hardwood forests.

Cap starts as an oval shape and then becomes convex, usually with a bump in the centre. It is sticky when fresh and has a bright red or orange colour that fades to orange or yellow towards the margin. The surface of the cap is smooth, without warts or patches. The margin is lined with long streaks that extend inward from the lighter coloured edge of the cap. The flesh is whitish to pale yellow, not staining on exposure. Gills moderately crowded to crowded, orange-yellow to yellow-orange to yellow. They are free from the stem or slightly attached to it. Stem yellow with orange to reddish fibres, typically slender, slightly tapering upward. The interior is hollow and has a yellow membranous ring near the apex. The volva is large, white and sacklike. Spore print white.

Microscopic Features: The spores are ellipsoid in shape, measuring 8-11 µm in length and 5-6.5 µm in width. They have a smooth surface and are inamyloid.

Similar species include Amanita caesarea which is found in Europe and North Africa and Amanita muscaria which sometimes lack patches because the rain has washed them away.

Amanita jacksonii on the MushroomExpert.Com Web site.

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