Key to species of Hincksia

1 Intertidal, in rope-like strands, cells of filaments isodiametric to twice as long as broad, hook-like or short lateral branches present; plurilocular organs about as long as broad H. breviarticulata
1 Subtidal, not rope-like, cells becoming larger than twice their diameter, without hooklike lateral branches; plurilocular organs cylindrical more than twice as long as broad attached alternately or adaxially H. mitchelliae

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