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Seaweed sporangia, light micrograph

Seaweed sporangia, light micrograph

C012/2550

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Credit

DR KEITH WHEELER / SCIENCE PHOTO LIBRARY DR KEITH WHEELER / SCIENCE PHOTO LIBRARY

Caption

Seaweed sporangia. Light micrograph of a section through the sporangia layer (purple) of a kelp seaweed, the sea belt (Saccharina latissima). At bottom is the epidermis layer (orange). Reproduction is asexual. Epidermal cells grow into two types (pink filaments): single-celled paraphyses (top part) and sporangia (bottom part). The spores (round, blue, seen within sporangia) are liberated from here into the sea, where they change in zoospores (that can swim) and settle on rocks to form new seaweed plants. Some released spores are visible at upper right. Magnification: x138 when printed at 10 centimetres wide.

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