360 BROADHURST: STRUTHIOPTERIS IN NORTH AMERICA 
Stipe anaes broad, 1-2 cm. long, flac- 
nd lying more or less 
crumpled along the stipe; ap- 
pressed somewhat formless ones 
ist and numerous in most 
Seistag pinnae mainly straight; lam- 
ae 6—24-jugate; lower sur- 
: see with definitely raised 
veins; margins revolut 
lower surface not 
neous. 12. S. costaricensts. 
Pinnae 6—23-jugate (averag- 
ing 10-18-jugate), the apex 
ptl 
base fully cordate; lower 
surface usually finely ara- 
neous. 20. S. striata. 
Sterile pinnae mainly falcate; lam- 
ina 2-4 times as long as 
peice ae LapSiee es 
diet irregularly so in 
S. Christii); margins rarely 
ly revolute. 
Sterile stipes chestnut; veins 
more or less raised below; 
fertile pinnae occasionally 
with epuriee protuber- oh 
11. S. Christi. 
“Sine then pagaltra sess to 
brow 
a 
h t- One 
oo of the pe 8, & weil folio. 
$$ seen 
* Except possibly in s. sessilifolia; the condition of the type specil 
it difficult to determine this. 
