Agaricus augustus, known commonly as the prince, is a basidiomycete fungus of the genus Agaricus. The fruiting bodies of Agaricus augustus are large and distinctive agarics. The cap shape is hemispherical during the so-called button stage, and then expands, becoming convex and finally flat, with a diameter from 8–30 cm (3–12 in). The cap cuticle is dry, and densely covered with concentrically arranged, brown-coloured scales on a white to yellow background. (Source: Wikipedia.org, CC BY-SA)