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Taxon
Halecium fragile Hodgson, 1950
Nomenclature
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Family: HaleciidaeGenus: Halecium
SUMMARY
Stems to 8 mm high, arising from a stolon loosely winding over host. Hydrocaulus monosiphonic, delicate, flexuous, of same diameter as hydrorhiza. A node above junction with hydrorhiza and one to three nodes below first hydrotheca; hydrocaulus simple or sparingly dichotomously branched from paired knob shaped apophyses below a hydrotheca. Cauline internodes long, straight or a little curved, expanding smoothly to hydrophore. Proximal node just distal to hydrophore, transverse to slightly oblique, deeply constricted.
Hydrotheca shallow, walls flaring to margin, diaphragm distinct, a row of desmocytes above, rim delicate, sometimes replicated. When present, secondary hydrophores arising from a constriction below hydrothecal diaphragm. Perisarc thin and smooth throughout.
Gonothecae given off on a pedicel from within hydrophore, pedicel rounded distally; gonotheca long, sausage-shaped, when mature with blunt apex, without operculum, perisarc very thin.