HQ FILICES. 



Very nearly related to the preceding species ; indeed differing only 

 in its less angular stipes and more membranaceous fronds, with divari- 

 cate segments. 



13. Pteris arguta, Vahl. 



Pteris arguta, Vahl; Willd. Spec. PL 5 ; p. 387; Agardh, Gen. Pterid. p. 36. 



Hab. Madeira and St. Helena. (The St. Helena plant differs in 

 no respect from that of Madeira.) 



***** Frondes tripinnatijidce vel tripinnatce. 



14. Pteris irregularis, Kaulf. 



Pteris irregularis, Kaulf. Bnura. Fil. p. 189; Agardh, Gen. Pterid. p. 18. 



P. alata, Gaud. Bot. Freyc. Voy. p. 391, t. 19 ; Hook. & Arn. Bot. Beech. Voy. p. 107. 



Hab. Sandwich Islands ; frequent. 



The specific name of Kaulfuss is certainly a very appropriate one, 

 as there are few Ferns where irregularity in the division of its fronds 

 prevails to such an extent as in the present species ; varying as they 

 do from bipinnatifid with the pinnules linear-lanceolate and entire, to 

 tripinnatifid, the segments oblong, obtuse, subfalcate, and the margin 

 crenate-dentate. The veins are usually forked, but occasionally two of 

 the venules unite and form elongated areoles. 



15. Pteris tremula, R. Br. 



Pteris tremula, R. Br. Prodr. Fl. Nov. Holl. p. 154; Agardh, Gen. Pterid. p. 40. 



P. chrysocarpa, Link. Hort. Berol. 



P. ajftnis, A. Rich. Bot. Voy. Astrol. p. 81? 



Ha.b. Bay of Islands, New Zealand : along the margins of woods. 

 Specimens of Pteris chrysocarpa of Link, from the Royal Botanic 



