116 



CHARACTERS OF TRIBES AND GENERA. 



fertile usually contracted. Veins arcuately or angularly 

 anastomosing. Eeceptades punotiform, produced on the 

 confluent apices of two or more eicurrent veinlets, ter- 

 minating in the medial areoles, sometimes partially com- 

 pital. (Sort round or ovate, transversely uniserial, naked. 



Type. Polypodiuvi hjcopodioides, Linn. 



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



Obs. — In venation and position of the sori the species of 

 this genus agree with Pleopellis, 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 (/Sic.) ; 

 A. lycopodioides (Linn.) (v v.) ; A. nitida (J. Sin.) (v v.) ; 

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

 (v v.) ; A. geminata {Schrad.) (v v.) {Polypodium iteophyL 

 lum, Kxe.) 



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. MiCROGnAM.MA, Pred. (183G). 

 Pohjpodiuiii sp). aiict. ; Hook. sp. Fil. 



Surculum slender, branched. Fronds distant, rising 

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

 inches long, firm, membranaceous. Vein,s irregular, com- 

 pound anastomosing, liewpjlades linear, compital, foriniug 

 oblique linear sori. 



Type. Pohjpodimn persicaricefolium, Mayer. 



lUust. Schk. Fil. p. 187, t. 8, C. ; Presl Tent. Pterid., t. 1), 

 f. 7. ; Hook and Bauer, Geu. Fil., t. 7-i A. 



Oils. — This genus is tounded by Prosl upon a siugio 

 sj/ocie^, riativ; ol' Trinidml, Guiana, and Brazil. In g<>ncvi)i 



