Phegopteris hexagonoptera
Larger than the preceding species, fronds triangular, as broad or broader than long, once-pinnate, pinnæ pinnatifid, lowest pair very large, basal segments of pinnæ forming a continuous, many-angled wing along the rachis. In dry woods and on hill-sides. P. [188].
51. OAK FERN
Phegopteris Dryopteris
Medium-sized, fronds thin and delicate, broadly triangular, spreading, ternate, the three divisions stalked, each division pinnate, pinnæ pinnatifid. In moist woods. P. [190].
52. BULBLET BLADDER FERN
Cystopteris bulbifera
Fronds delicate, elongated, tapering above from a broad base, 2-3 pinnate or pinnatifid, bearing fleshy bulblets beneath. On wet rocks, preferring limestone. P. [194].
53. COMMON BLADDER FERN
Cystopteris fragilis