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sporangium

sporangium BOT

sporangium BOT

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This sporangium is surrounded by one or more sheathing layers (integuments) which form the seed coat. en.wikipedia.org

A herbivorous animal such as a horse then eats the substrate, unknowingly consuming the sporangium as well. en.wikipedia.org

Interestingly, nematodes have been observed climbing the sporangiophore or swimming inside of it to catch a ride on the sporangium. en.wikipedia.org

Spores were shed via a slit at the top of the sporangium between thickened valve borders. en.wikipedia.org

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