A newly emerged, growing A. Jacksonii.A. Jacksonii at Salem Lake in NC
Amanita jacksonii, also known as Jackson's slender amanita,[2]American Slender Caesar, and Eastern Caesar's Amanita,[3] is a North American species of fungus in the family Amanitaceae. It is a reddish-orange colored mushroom species which can be identified by its yellow gills, large, white, sacklike volva.[4]
The cap of the mushroom is 8–12 centimetres (3–4+1⁄2 inches) wide; oval at first, becoming convex, typically with a central bump; sticky; brilliant red or orange, fading to yellow on the margin; typically without warts or patches; the margin lined for about 40–50% of the cap's radius. The red pigment fades from margin toward the center with age.[6] Gills are moderately crowded to crowded, orange-yellow to yellow-orange to yellow. They are free from the stem or slightly attached to it; yellow to orange-yellow; crowded; not bruising. The short gills are subtruncate to truncate. Its stipe measures 90–140 by 9–16 millimetres (3+1⁄2 in–5+1⁄2 in × 1⁄4 in–3⁄4in), is yellow and decorated with orange fibrils and patches that are the remnants of a felted extension of the limbus internus of the otherwise white volva. The spores measure (7.0-) 7.8–9.8 (-12.1) × (5.2-) 5.8–7.5 (-8.7) μm and are broadly ellipsoid to ellipsoid (rarely subglobose or elongate) and inamyloid. Clamps are common at bases of basidia.[7] The flesh looks whitish to pale yellow, and does not stain on exposure.
