Abstract
Mature female gametes of several Laminariales excrete a substance which acts interspecifically to release and to attract spermatozoids from ripe antherids. This pheromone was identified by chemical degradation and by synthesis of the natural compound as 1-(1′,2′-cis-epoxi-but-3′-enyl)- cyclohepta-2,5-diene (3). An oxirane is a novel feature among the mating substances of thallophytes. It is there­fore suggested to name the active hormone “Lamoxirene”.

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