X 
Table of the Genera of Ferns. 
Genus. Page. 
Anomalous . , . . ^ . . . .32 Ceratopteris . 123 
luclusium continuous, sori linear, continuous, covering 
ail or nearly all the space between the midrib and 
margin, fronds dimorphous, capsule ring vertical . 33 Lomaria . -125 
As in Lomaria, but capsule ring oblique . . -34 Plagiogyria . 1 27 
TRIBE VIL— BLECHNEtE. 
Indusiutn linear or oblong parallel with the midrib 
and opening towards it, not near the margin. 
Indusium membranaceous, distinct from the margin of 
the frond, parallel with and usually contiguous to 
the midrib, veins free ...... 35 Blechnum . 130 
As in Blechnum, only veins anastomosing . . 36 Blechnidium . 133 
Indusium linear-oblong, thick, in single rows parallel 
with and near the midrib, sori sunk in cavities . 37 Woodwardia . 135 
Indusium lunate, thin, in one or more rows, parallel 
with and near the midrib, sori not sunk . . 38 DooDiA . -135 
TRIBE VIIL— ASPLENIE/E. 
Indusium linear or oblong or horseshoe-shaped, 
opening tow<irds the midrib, sometimes double, sori 
attached to the veins. 
Indusium linear, single, veins free, their apices com- 
bined by a transverse marginal vein . . -39 Thamnopteris . 137 
Indusium linear or oblong single, veins free . . 40 Asplenium . 141 
As in Asplenium, but indusium more or less curved . 41 Athyrium . 161 
As in Asplenium, but indusium double . . .42 DiPLAZiUM . 174 
As in Diplazium, but veins anastomosing . . -43 Anisogonium . 191 
As in Asplenium, but veins anastomosing obliquely 
only towards margin of frond . . . -44 Hemidictyum . 194 
Indusium sausage-shaped, veins anastomosing and 
forming elongated areoles 45 Allantodia . 195 
Indusium linexr elongated, submarginal, fronds fan- 
like 46 AcTiNioPTERis '. 197 
