Phylum: Rhodophyta Family: Hildenbrandiaceae
Hildenbrandia rubra (Sommerfelt) Meneghini, 1841
An encrusting brownish-red alga, no more than half a millimeter thick. Can be found on rocks in the littoral zone and upper-shore rock-pools. Common
References:
Fish & Fish (2011) - A Student's Guide to the Seashore;
Bunker, et al - Seaweeds of Britain and Ireland