Table of the Genera of Ferns. 



Gbnus. Page. 



Areoles copious, each with two or more sori, fronds 



always simple and woolly beneath . . . .62 Niphoboi.us . 324 



Fronds flabellate in two halves, veins copiously anas- 

 tomosing . .63 Dipteris . . 334 



Fronds either with the base oak -leaf-like, or with 



separate sterile oak-leaf-like small fronds . . 64 Drynaria . . 338 



Fronds various, veins copiously anastomosing with 



free included veinlets ...... 65 Pleopeltis . 3 14 



TRIBE XL— GRAMMITIDE/E. 



Sori on the back of the lobes more than twice as 

 long as broad, usually linear. 



As in Cheilanthes, but without an indusiurrj, sori 

 though oblong or roundish at first, soon confluent 

 into a continuous line ...... 66 Nothol/ena . 373 



Sori linear, close to midrib on both sides, fronds 

 grass-like 67 Monogramme . 375 



Sori linear or linear-oblong, otherwise as in Phegop- 

 teris 68 Leptogramme . 377 



As in Nephr odium, but sori linear . . . .69 Stegnogramme. 380 



Habit of Cheilanthes, sori linear, veins free . . 70 Gymnogramme . 380 



Habit of Polypodium, sori linear, veins generally 



united by transverse veinlets near margin . 71 Syngramme . 384 



As in Pleopeltis, with copiously anastomosing veins, 

 sori linear, stipes articulate wiih caudex . . 72 Selliguea . 389 



As in Selliguea, but stipes not articulate and fronds 



leathery "jt, Loxogramme . 392 



Anomalous, veins arcuately anastomosing at the base, 



forming costal areoles ...... 74 Brainea . . 395 



As in Goniopteris, but sori elongated or confluent . 75 Meniscium . 397 



Sori carried along the veins imperfectly articulated, 



fronds simple 76 Antrophyum . 401 



Grass-like ferns, sori in continuous marginal lines, 



veins free . . . . . . . -77 Vittakia . . 404 



