Lithophyllum incrustans Philippi
Description: Thick, dull chalky, yellowish,
pink or lavender calcareous crusts forming irregular
concretions, to 40 mm thick, margins ridged where crusts
meet.
Habitat: On rock, lower intertidal semi-exposed
and exposed pools, subtidal to 30 m. west and south-west coasts,
common, especially in shallow subtidal. On the W and SW coasts
of Ireland, this species is frequently associated with
intertidal populations of the purple sea-urchin
Paracentrotus lividus, the pink encrustations of the
alga contrasting beautifully with the purples and greens of the
urchins, which frequently dominate exposed shore limestones.
Similar species: Many crustose corallines occur
in the intertidal and shallow subtidal, but require expert
examination to confirm their identities.
Video from the west coast of Ireland at Black
Head, Co. Clare showing the crustose corallines below the
Laminaria digitata:
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