Pteridaceae

Fronds1 to irregularly 4-pinnate, herbaceous. Sori in broad linear bands along margin of frond. Rhachis deeply grooved. Pteridaceae

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Fronds 1-pinnate or imperfectly bipinnate with some of the lower primary pinnae divided into a few, ribbon-like, sessile segments. Veins free, transverse to the midrib, usually simple or once forked

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Fronds 2–4-pinnate; the pinnules never ribbon-like. Veins reticulate or free and once forked