Life histories of <i>Colpomenia sinuosa</i> and <i>Hydroclathrus clathratus</i> (Scytosiphonaceae, Phaeophyceae) in culture

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<jats:title>SUMMARY</jats:title><jats:p>Life‐history studies in culture were carried out on <jats:italic>Colpomenia sinuosa</jats:italic> (Mertens ex Roth) Derbès et Solier and <jats:italic>Hydroclathrus clathratus</jats:italic> (C. Agardh) Howe (Scytosiphonales, Phaeophyceae) from Japan. These species showed a heteromorphic life‐history pattern with an alternation between erect thalli bearing plurilocular zoidangia and prostrate thalli bearing ectocarpoid plurilocular and unilocular zoidangia. Plurizoids released from erect and prostrate thalli developed into prostrate thalli. Unizoids, however, developed into erect thalli. Prostrate thalli produced plurilocular zoidangia in long‐day conditions and unilocular zoidangia in short‐day conditions at 10‐20°C. Prostrate thalli of <jats:italic>C. sinuosa</jats:italic> formed ascocysts. Germlings of both species did not grow at 5°C.</jats:p>

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