Fern leaves emerge as tightly coiled structures called:

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Fern leaves emerge as tightly coiled structures called fiddleheads. Microsporangia are structures that produce microspores in plants like ferns, but they are not the same as fiddleheads. Protonema are early developmental stages in mosses and some other nonvascular plants. Horsetails are a type of nonflowering plant with jointed stems and small leaves, but they do not have leaves that emerge as fiddleheads. Prothallus is the gametophyte stage of ferns, but it is not the structure that emerges as a tightly coiled fern leaf.

Fern Leaves Emerge as Tightly Coiled Structures Called