Bonnemaison's Hook Weed - Bonnemaisonia hamifera

Characteristics:

Brownish red, feathery fronds, sometimes cover the sea bed, like cotton wool. The flattened stipe is only 1 mm wide, but may reach a length of 35 cm.

Habitat:

It is usually found during spring in the lowest tidal or in the subtidal zones. It seems to prefer sunny locations.

Distribution:

It was probably introduced in Europe from the western Pacific, late in the 19th century. It is known from the western Pacific, North-East Atlantic Ocean and the Mediterranean.