How to tell Jewelled amanita from Yellow knight

The cap is 4 to 10 cm across, occasionally up to 12 cm. It starts convex, almost bell-shaped, then opens out flat, sometimes with a slight dip in the middle.

The colour runs from pale straw to bright egg-yolk yellow, usually darker and more ochre in the centre, and older caps fade to cream. The surface is slightly sticky in wet weather. Flat white flakes, the remains of the universal veil, sit on top, thickest in the centre. They come off easily and rain washes them away, so a cap can be completely smooth. The margin of a mature cap is grooved, with short lines like the teeth of a comb.

The cap is 4–12 cm across, flat-convex or with a low hump in the centre. It's yellowish green or olive yellow, dry or slightly moist, and often darker in the centre, with characteristic small fibrous scales. The margin is uneven and wavy.

The gills are free or only just touch the stem, crowded, soft and white, and may turn slightly yellowish in old specimens.

The spore print is white. The spores are smooth and broadly ellipsoid, roughly 8–11 × 6.5–8.5 µm, but that only shows under a microscope.

The gills are crowded and yellow or yellow-green (the same colour as the cap or brighter); yellow gills are one of the key identification features. They're attached to the stem. The spore print is white.

The stem is slender, 5 to 12 cm long and 0.5 to 1.5 cm thick, white or pale yellowish, smooth or finely downy, and fragile.

The ring is thin and membranous, like a little skirt, and sits halfway down the stem or lower. It doesn't last: often all that's left is a faint mark, and old specimens may have no ring at all. So a missing ring doesn't mean it isn't an amanita.

At the bottom the stem has a small rounded bulb. The volva hugs it tightly and ends in a narrow free collar at the top, sometimes broken into one or two rings or flakes. It isn't a tall sack as in the grisettes, nor a large, abruptly cut-off bulb as in the false death cap. The bulb is often sunk in the soil, so the mushroom needs to be dug up.

The stem is 4–8 cm tall and 1–2 cm thick, firm, solid and cylindrical, yellowish or yellow-green, and partly buried in sand. There's no ring and no volva.

The flesh is white, sometimes slightly yellowish in the stem, thin, and doesn't change colour when cut.

The flesh is firm, white or slightly yellowish, and doesn't change colour when cut. The taste is mild, mealy or slightly radish-like, with no bitterness.

The smell is faint, hardly noticeable. Some authors mention a slight radish note, but most field guides say there's no distinctive smell. The only lookalike you can tell by smell is the false death cap, which smells of raw potato.

The smell is mealy, slightly like cucumber or radish, as in many Clitocybe and Tricholoma species, with nothing unpleasant about it. In some mushrooms it's stronger and recalls fresh flour.