220 
, PAGE 
Stipes club-shaped at the base, and spring-- 
ing between two fleshy stipules. Pinnz 
and pinnules articulate with the rachis. 
Geaus LI.—Angiopteris Hoffmann 197 
SUB-ORDER VI—OPHIOGLOS- 
SACEZ 
Sporangia deeply two-valved, opening 
down the side nearly to the base, without 
a ring; vernation erect. Fronds bearing a 
sterile and fertile branch on the same 
stem. 
Sporangia sessile, arranged in two rows, 
forming a narrow close spike which arises 
from the base or centre of the barren 
segment, rarely distinct, rising direct from 
the rhizome; veins reticulate; fronds 
simple, entire, rarely palmate. 
Genus LII.—Ophioglossum L, 198 
Sporangia more or less round, sessile in 
stalked whorls which are terminated by a 
crest-like appendage, formiug a clustered 
simple spike, opening vertically by a slit 
on the exterior side. Fronds divided into 
fertile and sterile segments, the latter 
