190 BENGAL PLANTS. 
PTERIDOPHYTA. 
. confined to 4 
Leaves large in proportion to the stem, the fertile ones not ned tos 
particular 1egion :— De 
Leaves bearing sporangia on their lower surfaces (VII. Frnices):— — 
Sporangia with a ring ‘— 
Ring equatorial, encircling the Sporsti gree 7 
ing transverse, caudex and fronds rigid 
CLIL. Glei 
Ring vertical or if transverse (Trichomanes) the caudex fexitle 
and fronds thinly membranous . 
Ring opercular, crowning the sporangium ..CLIV. 
Sporangia without a ring, opening down one side :— 
Vernation circinate : sporangia marginal or dorsal 
T oe wae tee 
Vernation erect ; sporangia spicate ....CLVI. Ophi 
Fugacious floating annual aquatic herbs ....CLVII. Salviniace® 
erennial marsh-herbs with w.de-creeping slender ei 
aves small in proportion to the stem, the fertile ones very 
fined to a particular region :— : 
Leaves in whorls, the fertile ones peltate forming a spike yet . 
of the stem bearing sporangia on their inner faces (IX. Equ 
CLIX. Equ axillary 
Leaves not whorled, the fertile ones flat with sporangia 
(X. Lycopoprxrx) — * podiace® 
Sporangia uniform .... 2.2.2... ioq ie ees CLX. Ly lace® 
Higurrey sang CLXI. Selaginellace® 
