156 



Index 



New York fern, see Dryopteris novebora- 

 censis. 



Nephrolepis exaltata, i8. 



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- 



Pellaea; atropurpurea, 57-60, lobes of its 

 leaves partiy formed pinnae, 11, 12; gra- 

 cilis, see Cryptogramma Stelleri; Stelleri, 

 see Cryptogramma Stelleri. 



Pinnate venation, see Venation. 



Phyllitis scolopendriimi, 43-45. 



Poly podium 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 Pellasa atropurpurea. 



Scolopendrium vulgare, see Phyllitis sco- 

 lopendrium. 



Silvery spleenwort, see Athyrium thelypte- 

 roides. 



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, ig, 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, 100-103, '"^ ^^ hart's-tongue, 

 44, 45, in the purple cliff-brake, 58, 59, 

 in the slender cliff-brake, 94, 95, in the 

 Christmas fern, 86-88, in the Massa- 

 chusetts fern, 114, 115, in the New York 

 fern, no, 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. 



