* 
134 CHARACTERS OF TRIBES AND GENERA. 
Type. Aerostichum cervinum, Sw. 
Illust. Hook, and Bauer, Gen. Fil., t. 79, A; Moore Ind. 
Fil., p. 4, A; J. Sm. Ferns, Brit. and For., fig. 39 ; 
Hook. Syn. Fil., t. 7, fig. 60, m. n. o. 
Oss.—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 Q. corcovadensis, which is described as having 
the fertile pinns linear entire, thus differing from the 
usual forms of O. cervina, in which the fertile pinnæ are 
pinnatifid. Presl in his * Epimellia Botanica,” raises 
O. 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. O. cervina, Sw. (v v.) (Hook. and. Grev., Ic. Fil., t. SD 
O. corcovadensis, Radd. Fil. Bras., t. 14). 
Native of West Indies and Tropical America. 
*** Veins angularly or compoundly anastomosing. 
50.—Soromangs, Fée (1844). 
Polybotrya sp., auct. ; Acrostichwm sp., Hook. Sp. Fil. 
Vernation uniserial, sarmentum thick, scandent, elonga- 
ting, squamose. Sterile jronds pinnate, 1 to 3 feet long ; 
pinne 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. 
 Hllust. Moore Ind. Fil., p. 4, B; J. Sm. Ferns, Brit. and 
For., fig. 40; Hook. sche Fil, t. 7, fig. 60, r. s. ` 
