VIU 
Table of thr Genera of Ferns. 
Genus. 
Page. 
tribe II.— dicksonie^. 
Sori globose, indusium inferior, subglobose, free, 
sometimes covering the whole sorus, closed, at length 
bursting irregularly, more frequently cup-shaped 
entire or with two lips. 
Fertile fronds contracted with revolute margins, 
indusium hemispherical, very fugacious or wanting, 
veins free 7 Struthiopteris 20 
Indusium thin, subglobose, open at the top and 
laciniate 8 WooDSiA . . 20 
Indusium medial on a vein, thick globose pedicellate, 
bursting into two lips 9 Peranema . . 22 
Indusium apical on a vein, two-valved . . .10 Cibotium . . 24 
Indusium apical on a vein, cup -shaped . . .11 Dennst^dtia . 24 
TRIBE III.— hymenophvllej:. 
Filmy ferns, indusium inferior, apical on a vein, 
two -lipped or tubular. 
Indusium more or less two-lipped . . . .12 Hymenophyllum 28 
Indusium tubular, the mouth truncate or slightly two- 
lipped 13 Trichomanes . 36 
TRIBE IV.— DA\^ALLIE/E. 
Indusium squamiform, suborbicular or tubular, 
open at the apex, fastened broadly at the base, and 
sometimes at the sides. 
'Indusium apical on a vein, suborbicular coriaceous, 
attached by a broad base, the sides free . . . 14 Humata . ^ 46 
Indusium as in Humata, but thin and smaller and 
narrower 15 Leucostegia . 48 
Indusium a subcylindric cyst formed of the substance 
of the frond, apical on the veins . . . .16 Prosaptia . . 56 
Indusium apical, tubular, attached by the base and 
sides 17 Davallia . .58 
Iiidusimn apical, half cup-shaped, attached by the 
base and sides 18 Microlepia . 62 
