THE GENERA OF FERNS 
OF SOUTHERN INDIA. 
djlas'iifitjrtiojt, (after ||l00r^. 
FiLiCALES. — Acrogenous plants, witli dorsal or marginal one-celled spore-cases. 
Spore-cases fttrnUlccd with ajuuded rimj, v:hkh is tisuaUij nearlii complete, sometimes riuli- 
mentctnj. 
Spore-cases not valvate. 
Ring vertical, nearly complete, Spore-cases usually stalked, gibbous, bursting transversely. 
[A] Receptacles universal, i. e., occupying almost or quite tlie entire disk of the fertile fronds, 
both veins and parenchyma. 
Receptacles Local, circumscribed, i. e., confined to determinate parts of the veins, definite in 
form. 
(1) Sori transverse to tlie veins (wlien distinct veins are present) ; parallel or sub-parallel with 
the midrib or margin ; more or less elongated, usually linear, occasionally oblong nr 
Innately curved ; rarely punctiform (then marginal with transverse indusia.) 
[a 1] Receptacles seated on or approximate to the midrib, therefore costal or sub-costal (often at 
the same time marginal by the contraction of the frond) ; linear or oblong. 
((f) Sori linear superficial indusiate. 
(3) Sori linear or oblong, superficial or immersed, non-indusiate. 
\it 2] Receptacles marginal or sub-marginal, (rarely medial) always remote from the midrib, usually 
linear ; sometimes oblong or punctiform. 
{(() Sori non-indusiate, (mostly occuiiying a groove or furrow, sometimes superficial), linear. 
(a) Sub-marginal (often seated in a shallow dorsal furrow.) 
(/3) Marginal (always in an extorse marginal furrow.) 
{t>) Sori indusiate, superficial, (linear, oblong or rotundate.) 
(a) Indusium bursting along its outward margin, attached interiorly. 
(/3) Indusium bursting along its outward margin, attached exteriorly. 
Receptacles resupinate, /. e.. the Spore-cases attached on the under-surface of the indusium. 
Order. 
POLYPODIACE.^. 
Tribe I. 
PoLVPODINE.B. 
^ I- 
Acrosticheffi. 
Lomariea?. 
§ 3. 
Pleiirogrammeaj. 
Taenitidete. 
Vittariea;. 
§ G. 
Lindsteeaj. 
Adiauteas. 
