Immature fruit bodies of P. indusiatus are initially enclosed in an egg-shaped to roughly spherical subterranean structure encased in a peridium. The "egg" ranges in color from whitish to buff to reddish-brown, measures up to 6 cm (2.4 in) in diameter, and usually has a thick mycelial cord attached at the bottom.As the mushroom matures, the pressure caused by the enlargement of the internal structures cause the peridium to tear and the fruit body rapidly emerges from the "egg".