| General Information |
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| Distribution | A genus of about 25-30 species widespread in temperate zones and at higher elevations in the Tropics.
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Habit
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Epipetric or Terrestrial, small to medium-sized; rhizomes short-creeping to decumbent.
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Leaves
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Stipes slender, grooved, straw-colored to medium brown, mostly glabrous, bases with occasional membranous scales; cross-sections at bases reveal ends of 2 ribbon-shaped vascular bundles (appearing as linear and parallel lines); blade 2-pinnate to 2-pinnate-pinnatifid, herbaceous to somewhat coriaceous, glabrous or slightly scaly; veins free.
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Sori
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Sori round to cup-shaped; indusia hoodlike, attached at bases, free at margins, opening outward, partially overlapping sori.
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Notes
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Greek kystos, bladder or sac, + pteris, fern, alluding to the indusium shape.
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Contributor
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Nancy Khan
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