Stypocaulon scoparium (Linnaeus) Kützing
Description: Frond filiform, dark brown stiff
tufts, to 150 mm long, attached rhizoids. Filaments
segmented, each segment with 1-3 longitudinal divisions and
occasional secondary transverse divisions. Branching
abundant, irregularly alternate and pinnate; lateral branches
straddling cross wall between two articulations. Filaments
often densely packed giving from an appearance of a series of
inverted cones, shaving-brush like. Lower parts of
main axes often bare. Unilocular sporangia formed in clusters on
short branchlets in the axils of main branches; plurilocular
sporangia rare.
Habitat: Infralittoral epilithic, particularly
in sandy pools. Uncommon on southern and western coasts, rarer
further north.
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