Lomentaria orcadensis (Harvey) F.S. Collins ex W.R. Taylor
Description: Compressed crimson frond, to 40 mm long
(usually much smaller). Frequently ovate, with flattened lateral
branches distally, arising from creeping, narrowly cylindrical
stolons. Main fronds and branches with narrow bases and blunt
apices, hollow, with consticted nodes. Tetrasporgangia formed in
sori. Male and cystocarpic plants not known in Britain and
Ireland.
Habitat: On rock and
Laminaria hyperborea
holdfasts, silty lower intertidal pools and subtidal, on exposed
shores. Widely distributed; probably frequent but often
overlooked due to its small size.
Pictures: Northern Ireland © Bernard Picton, Ulster Museum;
bottom: Chimney Rocks, Penzance, Cornwall © David Fenwick.
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