KEY TO THE GENERA. 
The most prominent characteristics are ttalicised. 
Struthiopteris 
SECTION I. 
(Sporangia in spikes, panicles or berry-like structures.) 
* 
FRUITING FRONDS WHOLLY FERTILE. 
1, Fruit in a ome-séded spike ; plants very 
small; sterile frond thread lke, 
Curly grass. 
SCHIZ@A. 
a 
dq. Fruit in a cleb-shaped, thrice pin- 
nate, woolly, brown spike; fronds 
bipinnatifid ; fruit 2 early spring. 
Flowering fern. 
OSMUNDA, 
2. Fruit in derry-d7ke green structures, 
in a twice pinnate spike; fronds 
broad and coarse ; rootstock creep- 
ing. Fruit 2 date summer. Sen- 
sitive fern. 
ONOCLEA, 
1. Fruit in nearly cyfndrzcal slightly 
notched pinne; fertile frond pin- 
nate; sterile tall, bipinnatifid ; 
rootstock erect, fruit /afe. Ostrich 
fern. STRUTHIOPTERIS, 
PAGE, 
277 
25 
253 
257 
