134 CHAKACTEES OF TRIBES AND GENERA. 



Type. Acrosticlium cervinum, Sic. 



Illust. Hook, and Bauer, Gen. Fil., t. 7f , A ; Moore Ind. 

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

 Hook. Syn. Fil., t. 7, fig. £0, m. n. o. 



Obs. — This genus agrees with Polijljotrija 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. corcovmlensis, which is described as having 

 the fertile pinna3 linear entire, thus differing from the 

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

 pinnatifid. Presl in his " Epimellia Botanica," raises 

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

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

 both forms prodaced on the same plant. 



Sp. 0. cervina, Sw. (v v.) {Rouk. and Greo., Ic. Fil., t. 81 ; 

 0. corcoi-aJensit!^ Eadd. Fil. Ilras., t. 14). 



Native of West Indies and Tropical America. 



*** Ye'iits aiiguJarhj or compoiindhj anadomosing. 



50.— SOEOMANES, Fie (1844). 

 Poh/lotnia sji., anct. ; Acrosticliirni yji., Hool-. Sj), Fil. 

 Vernation uniserial, sarmentum thick, scandent, elonga- 

 tino-, squamose. Sterile fronds pinnate, 1 to 3 feet long ; 

 pinna? 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. Polyhotri/a serratifolia, Klot. 



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

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



