Acrochaete is a genus of marine green algae of the family Ulvellaceae known to live as endoparasites of other algae, although they may eventually be found growing on inorganic substrates, such as rocks.

[1][2] Species of Acrochaete are small prostrate and filamentous algae with irregularly branched filaments.

The cells produce hyaline hairs, which are considered a diagnostic character of the genus.

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