Strain:

Porifera

Class:

Demospongiae

Habitat:

Hard soil

Occurrence:

Mediterranean, north-east Atlantic
From shallow water to over 50 m, in light-exposed locations between algae as well as in shady places and in caves

Size:

Appearance:

Grows very variably: roundish, fig-shaped to large cushion-shaped
Colour: dark rusty to violet-brown in light areas
Consistency: very hard, but crumbly