156 
New York fern, see Dryopteris novebora- 
censis. 
Nephrolepis exaltata, 18. 
Onoclea sensibilis, 145-152; its relation- 
ship to Lorinseria areolata, 139, 147, 150, 
151; its leaf-development compared with 
that of Lorinseria areolata, 119, 150, 151; 
resemblance of its early stages of leaf- 
development to those of Lorinseria areo- 
lata and Osmunda spectabilis, 139, 147, 
change great in its transitional leaves, 5. 
Osmunda, regalis, see O. spectabilis, 139, 
147. 
Pella; atropurpurea, 57-60, lobes of its 
leaves partly formed pinnz, 11, 12; gra- 
cilis, see Cryptogramma Stelleri; Stelleri, 
see Cryptogramma Stelleri. 
Pinnate venation, see Venation. 
Phyllitis scolopendrium, 43-45. 
Polypodium vulgare, 49-53. 
Polypody, see Polypodium vulgare. 
Polystichum acrostichoides, 85-89; ap- 
pearance of spinulose points on the leaf’s 
margin, 8,9; leaf development exceeding 
its usual limits under certain conditions, 
7, 88, 89. 
Purple cliff-brake, see Pellzea atropurpurea. 
Scolopendrium vulgare, see Phyllitis sco- 
lopendrium. 
Silvery spleenwort, see Athyrium thelypte- 
roides. 
Index 
Slender cliff-brake, see Cryptogramma Stel- 
leri. 
Spinulose fern, see Dryopteris spinulosa 
intermedia. 
Unilateral venation, see Venation. 
Venation; anastomose pinnate, 12, de- 
velopment of, 18, 19, in the walking-leaf, 
132-134, in the narrow-leaved chain- 
fern, 138-141, 150, 151, in the sensitive 
fern, 18, 140, 141, 146, 148-151; free 
pinnate, development of, 12-18, in the 
ebony spleenwort, 78-81, in the maiden- 
hair spleenwort, 72-74, in the narrow- 
leaved spleenwort, 64, 65, in the silvery 
spleenwort, roo—103, in the hart’s-tongue, 
44, 45, in the purple cliff-brake, 58, so, 
in the slender clifi-brake, 94, 95, in the 
Christmas fern, 86-88, in the Massa- 
chusetts fern, 114, 115, in the New York 
fern, 110, in the marginal shield-fern, 120, 
in the spinulose fern, 126, 127, in the 
polypody, 50, 52, 53; free flabellate, 12, 
development of, 19-24, in the wall rue, 
28-30; free unilateral, 12, development 
of, 24, 25, in the maidenhair, 24, 25, 34, 
37-39- 
Walking-leaf, see Camptosorus rhizophyl- 
lus. 
Wall-rue, see Belvisia ruta-muraria. 
Woodwardia, areolata or angustifolia, see 
Lorinseria areolata. 
