A small to medium-sized mushroom with a distinctive, slightly curved stem and a broad, umbrella-like cap. The cap features a vibrant, warning coloration of deep reds or purples with white or yellow spots, indicating its toxicity. The surface is smooth with a slight sheen, and the gills underneath the cap are tightly packed and pale. The stem is fibrous and may show subtle striations or a faint, powdery residue.