CLASSIFICATION OF FERNS. 
97 
Suborder 4. Lycopodiese. — -Capsules without a ring, 
coriaceous, sessile in the axils of leaves or bracts, 1 - 
celled, 2- or3-valved. Stems leafy. Vernation not 
circinate. 
18. Lycopodium. 
Suborder 5. Isoetese.' — Capsules without a ring, inde- 
hiscent, immersed in a cavity at the base of long 
subulate radical leaves. Seeds on filiform recep- 
tacles. Vernation involute. Aquatic. 
19. Isoetes. 
Suborder 6. Marsilese. — -Fructification of two kinds. 
Capsules without a ring, in globose coriaceous invo- 
lucres near the root of the plant. Vernation involute. 
Aquatic. 
20. PlLULARIA. 
TABLE OF SPECIES AND VARIETIES. 
POLYPODIACE2E. 
POLYPODIES. 
1. Gymnogramme. 
] . G . leptophylla. Fronds ternate. 
2. Polypodium. 
1. P. vulgare. Fronds pinnatifid. 
a . var. Cambricum . Fronds broad; segments 
toothed. 
H 
