"1 Hypogeous are those soil fungi which produce macroscopic partially or completely embedded in soil or humus. While showing a superficial similarity correlated with habitat, they include members of the , and . 2 The edible s have been known from very early times, and speculations as to their nature are found in Greek and Roman literature. Other groups, which are not edible, were described later. The monographs of (1831, 1842) and & (1851) are the starting-point for all modern work on these fungi."