This sponge forms an irregular mass or crust with variable thicknesses, that depend on the substrata, current and light. The excurrent openings are placed on top of mounds, which can be branched. The texture is flexible but can break easily. It grows on hard substrata. Above water it gives a strong carbide scent.

Typically 200 mm diameter.

Orange-brown to dark-yellow, can also be slightly greenish.

From the shallow sub littoral up to great depths of about 600 metres diep.

North Atlantic ocean in America as well as in Europe. In Europe from north Norway to the Mediterranean.