116 CHARACTERS OF TRIBES AND GENERA. 



fertile usually contracted. Veins arcuately or angularly 

 anastomosing. Receptacles punctiform, produced on the 

 confluent apices of two or more excurrent veinlets, ter- 

 minating in the medial areoles, sometimes partially com- 

 pital. Sori round or ovate, transversely uniserial, naked. 



Type. Polypodium lycopodioides, Linn. 



Illust. J. Sm. Ferns, Brit, and For., fig. 11. 



OBS. In venation and position of the sori the species of 

 this genus agree with Pleopeltis, but their smooth, generally 

 shining fronds and naked sori is sufficient to rank them as 

 forming a distinct group. 



Sp. A. ovariensis (Desv.) (v v.) ; A. serpens (Sw.) ; 

 A. lycopodioides (Linn.) (v v.) ; A. nitida (/. Sm.) (v v.) ; 

 A. stigmatica (Pr.) (v v.) ; A. squamulosa (Kaulf.) 

 (v v.) ; A. geminata (Schrad.) (v v.) (Polypodium iteophyl- 

 lum, Kze.) 



OBS. With the exception of A. ovariensis, a native of 

 West Tropical Africa, the species are all natives of the 

 West Indies and Tropical America. 



32. MICROGRAMMA, Presl. (1836). 

 Polypodium sp. auct. ; Hook. sp. Fit. 

 Surculum slender, branched. Fronds distant, rising 

 from a short branch-like node, elliptical lanceolate, 4 to 8 

 inches long, firm, membranaceous. Veins irregular, com- 

 pound anastomosing. Receptacles linear, compital, forming 

 oblique linear sori. 



Type. Polypodium persicarifzfolium, Mayer. 



Illust. Schk. Fil. p. 187, t. 8, C. ; Presl Tent. Pterid., t. 9, 



f. 7. ; Hook and Bauer, Gen. Fil., t. 73 A. 

 OBS. This genus is founded by Presl upon a single 

 species, native of Trinidad, Guiana, and Brazil. In general 



