CHAEACTERS OF TRIBES AND GENERA. 289 



guished by the venation being reticulated, in that respect 

 agreeing with the following genus, Litobrochia. 



The following are the principal well-marked species, all 

 of which are natives of the Western hemisphere, except D. 

 ludens, which is a native of the Malayan and Philippines, 

 and which also differs from the rest of the species in its 

 vernation being sarmentose. 



* Vernation uniserial, sarmentose. 



D. ludens (Wall.) (D. WallicUi, J. Sm., 1841; Bedd. 

 F. Brit. Ind., pi. 27). 



** Vernation fasciculate, generally ccespitose. 



D. sagittifolia (Eaddi) (v v.) ; D. lonchophora (Mett.) ; 

 D. pedata (Linn.) (v v.) ; D. palmata (Willd.) (v v.) ; D. 

 collina (Eaddi) (v v.) ; D. ornithopus (Mett.) ; D. decipiens 

 (Hook.) ; D. decora (Bracken. Fil, t. 13). 



The two latter are natives of the Sandwich Islands, the 

 others are almost confined to Brazil. 



164. PELLJIOPSIS, /. Sm. 

 Pellcea sp., Hook. Sp. Fil 



Vernation fasciculate, sub-ceespitose. Fronds 6 to 18 

 inches or more in length, pinnate or bi-sub-tri-pinnate, firm, 

 smooth, castania-ebeneus ; pinnae and pinnules sessile, arti- 

 culate with the rachis. Veins anastomosing. Receptacles 

 transverse, marginal, forming a continuous sorus. Indusium 

 narrow. 



Type. Pteris articulata, Kaulf. 



OBS. The two species which constitute this genus, agree 

 in general habit with Pellcea, but differ in having reticulate 

 venation, which brings them in affinity with Doryopteris, 

 u 



