( 6 ) 
SORI IN CAPSULES SUNK IN A MANY-CELLED RECEPTACLE, 
OPENING BY CLEFTS. 
Capsule sessiles 69 — 72. 
Opening by cleft down side, close to one another 
in boat-shaped sori, near edge of frond. 
69 Angiopteris. 
In raised, circular, hollowed masses, with oblong 
clefts on inner face : frond like chestnut 
leaf. 72 Kaulfussia. 
Capsule deeply two-valved, opening down side nearly 
to base, vernation erect. 73 Ophioglossum. 
Capsule in small crested clusters, forming a long, 
loose spike. 74 Helminthostachys. 
Capsule sessile, in two rows on face of spikes, which 
form a compound panicle. 75 Botrychium. 
69, 72, 74, each a single species. 69, 75 differ 
from the true ferns in the sori not being held 
together by an elastic ring. 
