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Polymastia boletiformis (Lamarck, 1815)
Polymastia boletiformis is a sponge forming a smooth, hemispherical cushion base. Many tube-shaped outgrowths, slightly conical and between 2 to 10 cm in height, emerge from the base and are ending with the oscules. Its colour is uniform but may vary from yellow to orange, ochre, gray or greenish.
The Yellow Hedgehog Sponge grows on the upper faces of rock in the sublittoral zone.
Polymastia boletiformis is a sponge forming a smooth, hemispherical cushion base. Many tube-shaped outgrowths, slightly conical and between 2 to 10 cm in height, emerge from the base and are ending with the oscules. Its colour is uniform but may vary from yellow to orange, ochre, gray or greenish.
The Yellow Hedgehog Sponge grows on the upper faces of rock in the sublittoral zone.