Heterosiphonia plumosa (Ellis) Batters
Description: Bushy, deep crimson fronds, to 200
mm long, from basal disc. Axis prominent (compare with
Heterosiphonia japonica), cylindrical, diminishing in diameter from base to apex.
Branching repeatedly distichously pinnate, branches spreading,
alternate. Ultimate ramuli bifid or multifid, monosiphonous,
sharply pointed. Main axis of one central siphon, 9 pericentral
siphons and outer layer of corticating cells in which rings of
elongated cells alternate regularly with rings of short
cells.
Habitat: On rocks at low water and epiphytic
often on the stipes of
Laminaria hyperborea, low intertidal pools and subtidal, southern and western
shores, common in the south of Britain, rare in the north.
Widespread in Ireland.
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