34. WALKING FERN
Camptosorus rhizophyllus
Small, fronds undivided, heart-shaped at the base or sometimes with prolonged basal ears, tapering above to a prolonged point which roots, forming a new plant, fruit-dots oblong or linear, irregularly scattered. On shaded rocks, preferring limestone. P. [146].
35. HART'S TONGUE
Scolopendrium vulgare
Fronds a few inches to nearly two feet long, undivided, oblong-lanceolate, heart-shaped at base, fruit-dots linear, elongated. Growing among the fragments of limestone cliffs. Very rare. P. [150].
36. VIRGINIA CHAIN FERN
Woodwardia Virginica
Large, fronds once-pinnate, pinnæ pinnatifid, fruit-dots oblong, in chain-like rows parallel and near to the midrib, confluent when ripe. In swamps. P. [156].