134 CHARACTERS OF TRIBES AND GENERA. 



Type. Acrostichum cervinum, Sw. 



' Illust. Hook, and Bauer, Gen. Fil., t. 79, A; Moore Ind. 

 Fil., p. 4, A ; J. Sin. Ferns, Brit, and For., fig. 39 ; 

 Hook. Syn. Fil., t. 7, fig. CO, m. n. o. 



OBS. This genus agrees with Polybotrya in general 

 habit, but is technically distinguished by the veins being 

 combined by a transverse marginal vein. Olfersia was 

 originally founded by Raddi on a Brazilian Fern which 

 he named 0. corcovadensis, which is described as having 

 the fertile pinnse linear entire, thus differing from the 

 usual forms of 0. cervina, in which the fertile pinnas are 

 pinnatifid. Presl in his " Epimellia Botanica," raises 

 0. corcovadensis to the rank of a genus, which he names 

 Dorcapteris, but which is not tenable, for I have observed 

 both forms produced on the same plant. 



Sp. 0. cervina, Sw. (v v.) (Hook, and Grev., Ic. FiL, t. 81 ; 

 0. corcovadensis, Radd. Fil. Bras., t. 14). 



Native of West Indies and Tropical America. 



*** Veins angularly or compoundly anastomosing. 



50. SOROMANES, Fee (1844). 



Polylotrya sp., auct. ; Acrostichum sp., Hook. Sp. FiL 

 Vernation uniserial, sarmentum thick, scandent, elonga- 

 ting, squamose. Sterile jronds pinnate, 1 to 3 feet long ; 

 pinnge ovate lanceolate, 4 to 6 inches long, the lower pairs 

 pinnatifid. Veins pinnate ; venules arcuately anastomosing, 

 forming oblique elongated areoles, apices next the margin 

 free and clavate. Fertile fronds bipinnate, segments con- 

 volute, wholly sporangiferous. 



Type. Polybotrya serratifolia, Klot. 



Illust. Moore Ind. Fil., p. 4, B ; J. Sm. Ferns, Brit, and 

 For., fig. 40 ; Hook. Syn. Fil., t. 7, fig. 60, r. s. 



