XII 
Table of the Genera of Ferns. 
Genus. Page. 
Areoles copious, each with two or more sori, fronds 
always simple and woolly beneath . . . .62 Niphobolus . 324 
F'ronds 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 . 344 
TRIBE XL— GRAMMITIDEy^i. 
Sori on the back of the lobes more than twice as 
long as broad, usually linear. 
As in Cheilanthes, but without an indusium, sori 
though oblong or roundish at first, soon confluent 
into a continuous line ...... 66 Nothol.^na . 373 
Sori linear, close to midrib on both sides, fronds 
grass-like 67 Monogeamme . 375 
Sori linear or linear-oblong, other v\'ise as in Phegop- 
teris 68 Leptogramme . 377 
As in Nephrodium, 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 with caudex . . 72 Selliguea . 389 
As in Selliguea, but stipes not articulate and fronds 
leathery 73 LoxogramiME . 392 
Anomalous, veins arcuately anastomosing at the base, 
forming costal areoles ...... 74 Brainea . . 395 
As in Goniopteris, but sori elongated or confluent . 75 Menisci um . 397 
Sori carried along the veins imperfectly articulated, 
fronds simple 76 Antrophyum . 401 
Grass-like ferns, sori in continuous marginal lines, 
veins free . . . . . . . -77 Vittaria . . 404 
