608 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Polypodium myosuroides Swartz. 
This species, whose history and relationship were discussed at length in the 
last paper of this series,’ may now be reported from Porto Rico upon the basis 
of a single specimen collected by Mrs. Elizabeth G. Britton (no. 2670a) at Rio 
de Maricao, altitude 500 to 600 meters, on rocks, April 2, 1918. 
Polystichum tridens (Moore) Fée. 
Known hitherto only from Jamaica. The following specimen has been re- 
ceived under the wrong name P. triangulum var. ilicifolium: 
Santo Dominco: Azua, ad Las Caifiitas, alt. 1,350 meters, August, 1912, 
Fuertes 1931. 
2 Contr. U. S. Nat. Herb. 17: 398-406, 1914. 
