POLYPODIACEiE. 203 



of this genus, which embraces a large number of species of a rigid 

 habit, the ultimate divisions of their fronds usually spinulose. 



* Frondes pinnatce. 



1. POLYSTICHUM LONCHITIS, Rotll. 



Polystichum Lonchitis, Roth, in Willd. Spec. PL 5, p. 224. 



Hab. Pico Ruivo, island of Madeira. 



In our few specimens the pinnse are much less mucronately serrate 

 than in the usual European form of the species. 



2. Polystichum munitum, Presl. 



■ 



Polystichum munitum, Presl, Tent. Pterid. p. 83. 



Aspidium munitum, Kaulf. Enum. Fil. p. 236; Hook. & Arn. Bot. Beech. Voy. p. 

 162 & 405; Hook. Fl. Bor.-Amer. 2, p. 261. 



Hab. Oregon and California ; from Paget Sound to San Francisco : 

 in forests, near the sea-coast. 



Although there is a considerable resemblance between this and the 

 P (Aspidium) acrostichioides, yet it is nevertheless readily distin- 

 guished from that species, by its taller and more rigid fronds, with 

 linear-lanceolate pinnae, the fertile ones not at all contracted, their 

 margin mucronately serrate with appressed and sometimes bidentate 

 serratures, and the large sori, arranged in a single row nearer to the 

 margin of the pinnaa than to the costa. The sori ultimately become 

 confluent. 



3. Polystichum mohrioides, Presl. 



Polystichum mohrioides, Presl, Tent. Pterid. p. 83. 



Aspidium mohrioides, Bory, in Mem. Soc. Linn. Par. 4, p. 597, & in Duperr. Voy. p. 



267, t. 35. 

 Aspidium (Polystichum) mohrioides, Hook. f. Fl. Antarc. 2, p. 392, t. 149. 



