142 POLYPODIUM AKGUSTIFOLIUM. 



A native of the West Indies and South America, Brazil, 

 Jamaica, and Mexico. 



Introduced into the Royal Gardens, Kew, in 1841, from the 

 Royal Botanic Gardens of Berlin. 



Fronds glabrous, simple, acuminate, very narrow, coriaceous, 

 having a somewhat revolute margin. Decurrent at the base. 

 The fronds lateral, being articulated on a scaly rhizoma, which 

 is short and creeping. 



Veins immersed, the frond having a fleshy appearance. 



Sori medial. 



Length of frond from twelve to eighteen inches; colour a dull 

 green; and width of frond equal for half its length, becoming 

 narrow both at the base and apex. 



Best known as the Cyrtoplilehium angustifolium. 



My obligations are due to Sir Oswald Mosley, of Rolleston 

 Hall; Mr. Masters, of the Exotic Nursery, Canterbury; and to 

 Messrs. A. Henderson, of Pine-apple Place, for plants: and to 

 Mr. J. Henderson, of Wentworth; and Mr. Sim, of Foot's Cray, 

 for fronds. 



The illustration is from a plant in the Wentworth collection. 



