The Isles of Scilly Biodiversity Audit 2008 - Cornwall Wildlife Trust

Gracilaria bursa-pastoris A red seaweed NS On rocks in upper sublittoral 4,1Halymenia latifolia A red seaweed NR 4,1Pterosiphonia pennata A red seaweed NS On coralline algae, muddybedrock and pebbles, low waterto 10m, moderate to shelteredcoasts. 4,1Rhodophysema georgei A red seaweed NR Yes On Zostera 4,1Rhodymenia delicatula A red seaweed NR 4,1Schmitzia neapolitana A red seaweed NR Sublittoral 4,1Schmitzia hiscockiana A red seaweed NR Yes Sublittoral to 18 m on mobilesubstrates such as gravel andstones. Often in tide-swept areasor considerable wave exposure.4,1ALGAESpecies Common name UK Priority Local declineAtractophora hypnoides A red seaweed NRLocalrarityLocalthreat BAP habitat Habitat Comments RecommendationOn coralline algae, subtidal to20m 4,1Bornetia secundiflora A red seaweed NROn boulders and rock betweenlow water and 3m depth,moderate to exposed shoresOnlycollectedfrom Scillyin UK 4,1Carpomitra costata A brown seaweed NS On sublittoral rocks to over 30m 4,1Cruoria cruoriaeformis A red seaweed BAP Epiphytic on maerl, sublittoral 4,1Cryptonemia lomation A red seaweed NR Probablyconfined toScilly in UK 4,1Dermocorynus montagnei A red seaweed BAP Yes On small stones between 3 and9m and in seagrass beds 4,1Desmarestia dresnayi A brown seaweed NS Uncommon Subtidal to over 30m on stones insand 4,1Gelidiella calcicola A red seaweed NR Maerl associated 4,1Gelidium sesquipedale, G.corneumA red seaweed NR On rocks in sublittoral fringe,very wave exposed sites 4,1Gigartina pistillata A red seaweed NS Confined toSW England4,1Isles of Scilly biodiversity audit Page 95