Securiflustra securifrons is a subtidal species, present off all British coasts and particularly abundant towards the north of the country. The species is the disturbed throughout the subarctic boreal zone, down to the south coast of Spain. Colonies often exceed 10 cm in height, forming erect branched tufts, with terminally-squared or wedge-shaped fronds that are laterally flattened. Securiflustra securifrons attaches to hard substrates including stones and shells by an encursting basal portionof the colony. The colonies are whitish to light brown, becoming lighter towards the end of each frond.
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