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1 Petiole straw-colored, tan, or gray, not lustrous; rhizome scales lanceolate to ovate, > 0.3 mm wide.
....3 Petioles and rachises sparsely to densely pubescent, dull; pinnae long-stalked, those toward the base of the leaf on stalks 5-15 mm long; [of a variety of substrates, including non-calcareous]
......4 Spores 60-72 μm in diameter; spores 32 per sporangium
......4 Spores 38-52 μm in diameter; spores 64 per sporangium
..........6 Leaves mostly 1-2-pinnate, broadly deltate-triangular in outline
..........6 Leaves mostly 2-3-pinnate, lanceolate or narrowly triangular in outline
............ 7 Leaves oblong to elliptic in outline; pinnae either ternate toward the base of the leaf and simple toward the tip of the leaf, or all simple; primary leaf segments 5-10× as long as wide (unflattened); [known from outcrops in the upper Piedmont of SC]
............ 7 Leaves usually narrowly triangular in outline; pinnae usually pinnate toward the base, becoming ternate to simple toward the tip; primary leaf segments 3-5× as long as wide (unflattened); [known from outcrops in Piedmont of NC]