506 The Cryptogamous Plants of Dr. Roxburgh. 



Stem creeping up, and over large trees. Stipes somewhat 

 armed. Fronds alternately-pinnate ; sterile leaflets linear- 

 lanceolate, acutely-serrate, cuspidate ; fertile filiform, 



Filix non ramosa, &;c. Burm. Zeylan. p. 100, t, 46, good 

 for part of a barren leaf only. 



Panna valli. Rheed. Mai. 12, t. 35, the barren leaves. 



Nat. of various parts of India ; very old plants only fructi- 

 fy during the rains ; and when the involucre is fairly open, it 

 may be taken for an Acrostichum. 



Stems about as thick as a ratan, creeping up, and over 

 trees of the first magnitude, flexuose, angular, tolerably 

 smooth, except for little, rather sharp, warty prickles scat- 

 tered over every part. 



Stipes alternate, grooved on the upper sides, smooth, 

 except for a few very minute prickles ; length to the pinnae 

 from 6 to 12 inches. 



Fronds pinnate, about S feet long, drooping a little. 



Leaflets (pinnae,) from ten to twenty pair, alternate, sub- 

 sessile. The barren lanceolate, long, taper, acute pointed, 

 and most acutely serrate, smooth on both sides, veins nume- 

 rous, very fine, and nearly diverging; general length from 

 6 to 9 inches, and about 1 inch broad. 



Fertile leaflets before the involucre opens filiform, after 

 the capsules begin to burst, they become considerably 

 broader; if found in this state only, it may be taken for 

 an Acrostichum, and when still more advanced, the edges 

 of the leaflets and involucre become involute, exposing the 

 numerous minute capsules as if it were in a spike. 



Involucre uncertain. 



8. P. lunulata. Retz. Obs. 2, No. 99, t. 4. Adiantum lunu- 

 latum. Burm. Wall. Cat. 61, No. 77. 



Stipes in tufts, polished, black. Fronds (6-18 inches,) long- 

 er than the petioles, recurved, alternately pinnate ; leaflets 

 petioled, somewhat crescent-shaped, smooth. 



Avenka. Rheed. Mai. 12, t. 40. 



