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Indusium quite continuous, sori linear, conti- 
nuous, occupying a slender filiform receptacle in 
the axis of the indusium. Veins free, rarely 
those of the last division but one or more are 
less connected by arching veins at the very 
base: 
I. Stipes tufted, indusium single. 
(a) Integrifoliz—Lower pinne linear, un- 
divided. 
1. P. longtfolta. 
(b) Furcate.—Lower pinnz forked or 
slightly pinnate. 
(:) Pinnz of the sterile frond consider- 
ably broader than the fertile and 
distinctly toothed. 
1. Sterile frond about the size of the 
fertile. Lower pinnz cleft down 
into two or three pinnules. 
2. P. crettca. 
2: Sterile frond much smaller than 
the fertile and more compound. 
Lower pinne simple, forked, trifid 
or compound. 
3. P. enstformis. 
