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Key to Polypodiaceae

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1 Leaves entire, unlobed.
..2 Sori confluent into a marginal band towards the leaf apex; [subfamily Polypodioideae]
..2 Sori discrete, round, elliptical or oblong.
....3 Leaf blade scaly on the lower surface with peltate, bicolored scales; stems (rhizomes) long-creeping, ca. 1 mm in diameter, the leaves scattered; [subfamily Polypodioideae]
....3 Leaf blade scaleless on the lower surface; [subfamily Campuloneuroideae]
......4 Stems (rhizomes) short-creeping, 2-10 mm in diameter, the leaves clustered; main lateral veins either readily apparent (and then parallel to one another or obscure
......4 Stems (rhizomes) long-creeping, 0.5-1.5 mm in diameter, the leaves spaced along the rhizome; main lateral veins obscure, anastamosing
1 Leaves either pinnatifid to 1-pinnate, or palmately and dichotomously lobed.
........5 Leaves palmately lobed, the lobes branching dichotomously; foliage indument of stellate hairs; [subfamily Platycerioideae]
........5 Leaves pinnatifid or pinnate (the lobes arrayed along an axis); foliage indument absent or of simple hairs or scales.
..........6 Leaves 1-pinnate; [subfamily Serpocauloideae]
..........6 Leaves simple, 1-pinnatifid.
............ 7 Plants dwarf, the leaf blades < 5 cm long; [occurring only in habitats where the air is constantly humid and the substrate saturated, as in grottoes behind waterfalls]; [subfamily Grammitidoideae]
............ 7 Plants larger, the leaf blades 7-90 cm long; [occurring in moist to dry habitats].
............ ..8 Leaf blade densely scaly on the lower surface with peltate, bicolored scales; rhizome 1-2 mm in diameter; leaf segment margins entire; [subfamily Polypodioideae]
............ ..8 Leaf blade scaleless on the lower surface; rhizome 3-15 (-30) mm in diameter; leaf segment margins denticulate (Polypodium) or entire (Pecluma, Phlebodium, Phymatosorus).
............ ....9 Larger leaves with > 25 pairs of segments, each 1.5-5 (-8) mm wide; [of ne. FL southward]; [subfamily Polypodioideae]
............ ....9 Larger leaves with < 25 pairs of segments, each (3-) 5-40 mm wide; [collectively widespread in our area.
............ ......10 Venation free or with a row of areoles between the pinnae midveins and margins; rhizome 3-6 mm in diameter; leaf blade < 9 cm wide; [subfamily Polypodioideae]
............ ......10 Venation highly reticulate, with 3-4 rows of areoles between the pinnae midveins and margins; rhizome 3-30 mm in diameter; leaf blade 10-50 cm wide.
............ ........11 Sori borne in distinct depressions in the blade surface; rhizome 3-6 mm in diameter; sori in (1-) 2-3 rows on each side of the costa; [subfamily Microsoroideae]
............ ........11 Sori borne on the planar blade surface or slightly sunken; rhizome 8-30 mm in diameter; sori in 1-2 row on each side of the costa; [subfamily Polypodioideae]
............ ..........12 Plant with 2 distinct frond types, sessile nest fronds with shallow lobes which turn a light coppery brown, and long-petiolate foliage fronds which are green and pinnatifid with deep sinuses; [subfamily Crypsinoideae]
............ ..........12 Plant lacking nest fronds, only bearing long-petiolate foliage fronds with deep sinuses; [subfamily Polypodioideae]
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