180 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
P. poLYPODioiDES (L.) A. S. Hitchcock, Rep. Mo. bot. garden, 
vol. 4, p. 156 (1893). Acrostichum polypodioides L., Sp. pi., vol. 2, 
p. 1068 (1753). Polypodium incanum Sw., Prod. veg. Ind. Oce., 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- 
stickum serrulatum Sw., Prod. veg. Ind. Occ, p. 128 (1788). Polypo- 
dium serrulatum Mett., Fil. hort. Lips., p. 30 (1856), not Sw. (1800). 
Xiphopferis 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. pL, 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. cx 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. calomek^ena (L.) Link, Fil. sp. hort. bot. BeroL, p. 141 (1841). 
Acrostichimi calomelanos L., Sp. pL, vol. 2, p. 1072 (1753). Gymno- 
granima calomelanos Kaulf., Enum. Fil., p. 76 (1824). — San Juan 
INIt., 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 tartarcum Cav., Descr. pL, 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. 
