Hysterangium 'grey-green'

The fruitbody is a truffle and is roughly globular (or tapering a little at the base), up to 3 or so  centimetres in diameter. However, fruitbodies may become distorted if several are abutting and growing in a compact cluster. The texture is that of firm rubber. The outer surface is smooth and dingy white or some shade of brown. The inside is greyish-green, with numerous tiny cavities and also with branching veins. The veins may be somewhat tree-like, with finer branches arising from a thicker 'trunk' and are often colourless and gelatinous.   

These truffles are found on the ground, sometimes largely buried, sometimes protruding to a fair degree above the soil surface.

There are several species in this group, separated by microscopic features.

Look-alikes

The combination of rubbery texture and veined, grey-green interior are distinctive. Species of Chamonixia may show a bluish surface bruising but are different internally.