Gary Fewless

Key to the Ferns

44. Indusium cup-shaped (each "cup" is a combination of a true indusium and the inrolled leaf margin) and located at the margin of the blade segments; blade conspicuously hairy on both surfaces.	Dennstaedtia punctilobila
44. Indusium round or kidney shaped, (or cup-shaped of strap-like or hair-like segments in Woodsia) and not marginal except in Dryopteris marginalis, the blades of which are glabrous; blades of other species glabrous or hairy.	45

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