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Thelypteridaceae
See list of 3 genera in this family-
1a. Leaf blades ± triangular; some of the basal leaflets connected by a wing of tissue along the rachis; costae not grooved adaxially; indusium absent
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1b. Leaf blades narrow-lanceolate to elliptic; none of the basal leaflets connected by a wing of tissue; costae grooved adaxially; indusium present
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2a. Abaxial surface of costae without scales; veins of ultimate segments not forking near margin; leaf blades with either red to orange resinous glands (e.g., P. simulata) or greatly reduced lower leaflets (e.g., P. noveboracensis)
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2b. Abaxial surface of costae with small, tan scales; veins of ultimate segments of vegetative blades usually forking near margin; leaf blades lacking both red to orange glands and greatly reduced lower leaflets
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Each photo represents one genus in this family.