Range & Status
An introduced species found in the subtidal fringe where it grows epilithically on the bedrock (granite) and boulders in sites very exposed to wave action and semi-exposed to tidal streams, in up to 5m depth of water. Previously only known from southern British Columbia to California and Japan in the Pacific Ocean. The records from the Isles of Scilly are the first and only records for the north-east Atlantic. Originally found in 1967 (but not then identified), it has since been found in relatively high abundance in numerous sites which suggests that, although originally an immigrant species, it is now a permanent feature of the marine flora of the archipelago.