Catenella caespitosa on overhanging, or shaded vertical, upper eulittoral rock
|Marine Habitat Classification for Britain and Ireland Version 97.06
|Overhanging or shaded vertical littoral fringe and upper eulittoral bedrock may be characterised by the red alga Catenella caespitosa, together with littorinid molluscs, the anemone Actinia equina, ephemeral green algae Enteromorpha spp. and shade-tolerant red algae (e.g. Lomentaria articulata). Often at the same level on these shores, south-facing vertical rock is characterised by similar-looking patches of the lichen Lichina pygmaea (BPat.Lic). Where the turf of Catenella is well established, barnacles are rare or absent from the biotope. In the south-west, the red alga Bostrychia scorpioides is commonly found with Catenella and may co-dominate. B. scorpioides is also known to occur on the north and east coast of Scotland and the Outer Hebrides.
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