16. PURPLE CLIFF BRAKE
Pellæa atropurpurea
Medium sized, 1-2 pinnate, leathery. Fertile fronds taller and more contracted than the sterile, sporangia bordering the pinnæ. Usually on exposed rocks, preferring limestone. P. [90].
17. CHRISTMAS FERN
Aspidium acrostichoides
Rather large, smooth and glossy, once-pinnate. Fertile fronds contracted at the summit where the fruit appears. In rocky woods. P. [96].
18. NARROW-LEAVED SPLEENWORT
Asplenium angustifolium
Tall and delicate, once-pinnate. Fertile fronds taller and narrower than the sterile. In moist woods in late summer. P. [98].