Abstract
SUMMARY Zygotes of Bryopsis hypnoides from Banyuls and the Rade de Brest grew into filamentous germlings which divided into stephanokontic zoids. Some of the germlings from Banyuls directly developed new Bryopsis plants. In culture the germlings of Bryopsis hypnoides collected in Banyuls have a longer “dormancy” than those of the Bryopsis hypnoides collected in the Rade de Brest. Zinc-chlor-iodine and Congo red positively stain the wall of the Bryopsis phase and negatively the walls of the germling phase. The germling phases of Bryopsis hypnoides from the Rade de Brest and of several other Bryopsis species are uninucleate, each containing one giant nucleus.
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