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Order Polypodiales, Sub-order Polypodiineae, Family Polypodiaceae, Genus Polypodium. This beautiful fern is present in our area, living in crevises in granite outcrops. For more information please go to Pteridophyte Phylogeny Group, Wikipedia, and Southwest Colorado Wildflowers.
These odd little bunches on the underside of the fern leaf are "sori," which contain the sporangia, in which the spores develop.
This image is from the Howard Hughes Beautiful Botany site.