202 FILICES. 



row on each side, placed near the costa of the pinnules or segments, 

 furnished with a flat, entire, firm, round-reniform indusiwn. 



A well-marked species, readily distinguished by its rusty appear- 

 ance, and by the large subcostal sori. 



* * * * Frondes decomposites, divisionibus tripinnatis. 



19. Lastrea dayallioides, Sp. Nov. 



L. stipite tereti scabro basi squamoso ; frondibus subcoriaceis decompositis, 

 diviskmibus tripinnatis; pinnis primariis et secundariis oblongis 

 acuminatis; pinnulis rJiomboideo-lanceolatis pinnatifidis, laciniis Ian- 

 ceolato-linearibus' acutis inciso-serratis ; rhachi cum costa furfuraceo- 

 hirsuta; soris solitariis ; indusio rotundato-reniformi integerrimo. 



Hab. Tahiti, Society Islands : in mountain forests. 



Stipe 2 feet and upwards in length, about the thickness of a quill 

 from the wing of a swan, perfectly round, firm, slightly scabrous, chafly 

 with long and slender paleaB at the base. Fronds large and spreading, 

 subcoriaceous, smooth on both sides, somewhat shining above, decom- 

 pound, the primary and secondary divisions of the branches termina- 

 ting in a sharply serrate point. Plnnxdes usually less than an inch in 

 length, somewhat rhombic-lanceolate, deeply pinnatifid, decurrent. Seg- 

 ments lance-linear, acute, and cut into 3 to 5 sharp teeth. Ehachis 

 throughout and costa of the laciniae furfuraceous-hirsute with short 

 brown hairs. Sori small and solitary, seated on the middle of the 

 teeth near their base; furnished with a persistent, round-reniform, 

 entire indusium. 



In habit and general appearance this is very much like Davallia 

 elata of Swartz. It is closely related to the Aspidium expansum of 

 Willdenow. 



63. POLYSTICHUM, Both, Presl, J. Sm. 



(Aspidii Spec. Sw. & Auct. Tectaria, Cav. Rumohra, Raddi.) 

 Pblysticlmm aculeatum and P. Lonchitis may be considered the types 



