SINCE 1828
Rivulariaceae
plural noun
Riv·u·lar·i·a·ce·ae
Definition of Rivulariaceae
: a family of freshwater blue-green algae (order Hormogonales) consisting of slender gradually attenuated or hair-tipped filaments usually growing in tufts attached to the substrate and frequently mucilaginous — see calothrix , rivularia
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Merriam-Webster unabridged
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