180 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 



P. POLYPODioiDES (L.) A. S. Hitclicock, Rep. Mo. bot. garden, 

 vol. 4, p. 156 (1893). Acrostichum pohjpodioides L., Sp. pL, vol. 2, 

 p. 1068 (1753). Polypodium incanum Sw., Prod. veg. Ind. Oec, p. 

 131 (1788).— San Juan Mt., alt. 450 m., Johnston, no. 157, July 6. 

 Southern and central United States to Argentina. 



XiPHOPTERIS Kaulf. 



X. SERRULATA (Sw.) Kaulf., Enum. Fil., pp. 85, 300 (1824). Acro- 

 stichum serrulatuni Sw., Prod. veg. Ind. Occ., p. 128 (1788). Polypo- 

 dium serndatum Mett., Fil. hort. Lips., p. 30 (1856), not Sw. (1800). 

 Xiphopteris extensa Fee, lime Mem., p. 14, pi. 19, fig. 3 (1866), not 

 Polypodium extensum Forst. (1786), Presl (1825), nor Fee (1869).— 

 Juan Griego trail, alt. 450 m., Johnston, no. 144, Aug. 12-15. Tropi- 

 cal America generally. Also occurs in Africa. 



Adiantopsis Fee. 



A. radiata (L.) Fee, Gen. Fil, p. 145 (1850-52). Adiantum 

 radiatum L., Sp. pi., vol. 2, p. 1094 (1753). — San Juan Mt., alt. 400 m., 

 Johnston, no. 184, July 6. Not uncommon in the American tropics. 



Adiantum L. 



A. TETRAPHYLLUM H. & B. ex Willd., Sp. pi., vol. 5, 441 (1810); 

 Urb., Symb. Ant., vol. 4, p. 45 (1903), where reported as occurring on 

 Margarita Island. — El Valle, Miller & Johnston, no. 166, July 25; 

 Juan Griego trail, alt. 300 m., Johnston, no. 162. Tropical America. 



Ceropteris Link. 



C. calomelaena (L.) Link, Fil. sp. hort. bot. Berol., p. 141 (1841). 

 Acrostichum calomelanos L., Sp. pi., vol. 2, p. 1072 (1753). Gymno- 

 gramma calomelanos Kaulf., Enum. Fil., p. 76 (1824). — San Juan 

 Mt., alt. 550 m., Johnston, no. 182, July 19. Tropical America. 

 Africa. Escaped from cultivation in Luzon. 



C. tartarea (Cav.) Link, Fil. sp. hort. bot. Berol., p. 142 (1841). 

 Acrostichum tartareum Cav., Descr. pi., p. 242 (1802). Gymno- 

 gramma tartarea Desv., Mag., Gesellsch. nat. Fr. Berlin, vol. 5, p. 305 

 (1811).— San Juan Mt., alt. 795 m., Johnston, no. 181, Aug. 28. 

 Tropical America; uniformly at a higher elevation than the preceding. 



