Grateloupia filicina (J.V. Lamouroux) C. Agardh
Description: Compressed, tufted, dark purplish brown
fronds, to 120 mm high, main axis 1-4 mm broad. Once or twice
pinnate, axes and branchlets tapered at base and apex.
Habitat: On rock in pools. mid-intertidal to shallow
subtidal, sporadic, often locally common; SW England and Wales,
S and W Ireland north to Donegal.
Similar species: Plants known as
Grateloupia filicina var. luxurians A. & E. S.
Gepp, found on pebbles and shells in open muddy and sandy
estuarine habitats in Hampshire and Dorset, are now referred to
as Grateloupia subpectinata Holmes. This entity, which is
very much larger than Grateloupia filicina var.
filicina at up to 500 mm in length represents an
immigrant, perhaps of Australian origin, the first European
record of which was from the Isle of Wight, in 1949. It is
likely to have been introduced into harbour areas in Australia,
Brittany, Spain, and Mediterranean France, probably from
Japan.
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