DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY
Seaweed female sex organ. Light micrograph of a section through a conceptacle from a female of the seaweed bladder wrack (Fucus vesiculosus). The lining of the conceptacle consists of sterile multi-cellular hairs called paraphyses, and female reproductive structures (oogonia, orange). Each oogonium has two cells, one being the stalk cell and the other dividing into eight egg cells (ova). Male reproductive structures antherozoids) are chemotactically attracted to the conceptacles of female seaweeds, entering through the ostiole (hole at upper right) to fertile an ova. Magnification: x37 when printed at 10 centimetres tall.
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