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Taxon
Halecium brevithecum Watson, 2008
Nomenclature
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Family: HaleciidaeGenus: Halecium
SUMMARY
Stem (branch) fascicled, polysiphonic tubes varying from knotted to parallel.
Branching irregular, ultimate branches monosiphonic, given off from side of a hydrophore; branches beginning with three to five deeply indented transverse nodes, internodes thereafter moderately long, walls smooth, abaxial wall expanding smoothly into hydrophore; nodes transverse to weakly oblique, deeply incised into perisarc, a faint tumescence in internode above and below node.
Hydrophores indistinct, adcaudal wall adnate to internode, becoming free (although this scarcely visible) just below hydrotheca.
Hydrotheca distal on internode, adcaudal wall adnate to internode; margin tilted at an obtuse angle away from internode; hydrotheca very shallow, expanding imperceptibly to rim; rim not quite reaching node, walls of hydrotheca thin; diaphragm transverse, strong. No marginal replications or linear series of hydrophores.