POLYPODIACE^]. 17 



28. POLYPODIUM UNIDENTATUM, Hook. & Am. 



P. ccespitosum ; frondibus decompositis laxis glabris tripinnatis ; pinnulis 

 pinnatifidis lanceolatis attenuatis, laciniis oblongis vel lanceolato-ob- 

 longis obtusis subfalcatis crenato-ser rails ; rhadii glabra sidcata; venis 

 dichotomis. 



Polypodium unidentatum, Hook. & Am. Bot. Beech. Voy. p. 105. 



Hab. Sandwich Islands : on the outskirts of forests. 



Fronds from 2 to 3 feet high, decompound, with a smooth, sulcate, 

 stramineous stipes and rhachis; the primary and secondary divisions 

 lax, distant, and spreading. Segments of the pinnules varying in size 

 and form, according to their position on the frond; their margin 

 crenate-serrate, with a sharp tooth near the base of the sinus on its 

 lower side. Sori seated on one side and close to the base of a sinus. 



29. Polypodium: Sandwicense, Hook. & Am. 



Polypodium Sandwicense, Hook. & Arn. Bot. Beech. Voy. p. 105. 



Hab. Sandwich Islands : in forests of Hawaii. 



This has large tripinnate fronds, from 3 to 4 feet high, with smooth 

 spreading pinnae; the ultimate divisions pellucid-punctate, oblong, 

 obtuse, closely serrated with fine incurved sharp teeth. Rhachis and 

 costa sulcate on the upper side, bearing scattered, long, slender paleae. 

 Veins very evident and forked, with numerous distant sori, seated 

 close to the margin on the inner side of a tooth. 



The whole plant has a good deal the habit of the preceding, but is 

 withal distinct. 



30. Polypodium rugulosum, Labill. 



Polypodium rugulosum, Labill. ex Willd. Spec. PI. 5, p. 206 ; R. Br. Prodr. Fl. Nov. 

 Holl. p. 147; Kaulf. Enum. Fil. p. 122; Hook. & Arn. Bot. Beech. Voy. p. 52. 



5 



