The tip of each sporangiophore has an oval structure called?
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the strobilus are called sporangiophores; each consists of a stalk bearing a flattened disk at its apex, on the lower edge of which is a ring of 5 to 10 sporangia, each one opening and shedding spores by a longitudinal slit on its inner side. The Carboniferous treelike horsetails…
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