GUIDE
FERTILE FRONDS UNIFORMLY SOMEWHAT LEAF-LIKE IN APPEARANCE, YET DIFFERING NOTICEABLY FROM STERILE FRONDS
15. SLENDER CLIFF BRAKE
Pellæa gracilis
A small fern, 1-3 pinnate. Very delicate. Fertile fronds taller, more contracted and simpler than the sterile, sporangia bordering the pinnæ. Usually on sheltered rocks, preferring limestone. P. 87.
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.
19. NET-VEINED CHAIN FERN
Woodwardia angustifolia
Large, fronds deeply pinnatifid, the fertile taller and more contracted than the sterile. In wet woods near the coast. P. 102.
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