Much as I love ferns the back steps at my father's house are not the spot for a large colony of them. It's suitably shady and rather damp when the gutters overflow so they've established themselves from spores.
 I teased up the fibrous roots and transferred a dozen or so Hart's Tongue Ferns (Asplenium scolopendrium) to a nearby planter. They have a rippling almost serrated edge which characterizes some forms and cultivars of the species. Possibly the Narrow Leaved Hart's Tongue (A. scolopendrium 'Angustifolia')?