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Fronds simple, pinnatifid or pinnate. Veins 
copiously anastomosing with free included 
veinlets. 
I. Fronds simple. 
(a) Main veins not distinct to the edge. 
(t) Under-surface naked. 
1. Fronds 6-12 inches long, 4—% 
inch broad. Texture coriace- 
ous. Sori neversunk in a cyst. 
1. P. linearis. 
2. Fronds larger, up to two feet Jong 
by 1-2 inches broad. Texture 
thinner.- Sori deeply sunk in a 
cyst. 
2. P. simplex. 
(it) Under-surface clothed with small 
peltate scales. 
oo - oa 
3. P. lanceolata. 
(6) Main veins distinct to the edge or 
nearly to the edge. _ 
(1) Texture thin, membranaceous. 
Venation distinct, prominent. 
4. P. membranacea. 
