CHAIiACTEES OP TRIBES AND GENERA. 101 



nacea {Von.) (v v.) (0. undulata, J. Sin.} ; C. longissiraa 

 {Bl.) ; C. Zippelii {Bl.) ; C. Samarense, /. Sin. (Biblemma, 

 J. Sm. 184,1) ; C. tenulorns, /. Sm. ; 0. superfioiale {Bl.) ; 

 C. erioides {Pair.) {Microsorum erioides, Binh.) 



** Fronds lohed or pinnatifid. 

 C. tridactylon (Wall.); C. Labrusca {Hooh.) ; 0. spec- 

 trum {Kaulf.); C. insigne {Bl.) ; C. dilatatum {Wall.); C. 

 affine {Bl.) 



17. Selliguea, Boet. (1829). 

 Orammites, Blume ; Gynmograiiima, Hooh. Sp. Fil. 



Sureuhmi slender, elong-ating, epigeous, and squamose, 

 or snb-hypogeous and naked. Fronds stipate, 1 to 2 feet 

 long, simple, linear lanceolate or broad elliptical, rarely 

 pinnatifid, smootli, opaque, the fertile longer than the 

 sterile, and often sub-contracted. Primary veins costajforni, 

 straight. Venules compound anastomosing, with free vein- 

 lets terminating in the areoles. Bectpiaeles coropital, 

 elongated, oblique, forming a continuous or sub-interrupted 

 linear sorus between the primary veins. 



Type. Selliguea Feet, Bory. 



Illust. Hook. Grev. lo. Fil. t. 5 and G; Hook. Bot. 

 Mag. t. 5328 ; Moore, lud. Fil. p. 52 A. ; J. Sm. 

 Ferns, Brit, and For., fig. 23. 



Obs.- — The species comprehended under this genus agree 

 in many respects with Pleuridiuni, but are technically 

 distinguished by the fertile fronds being generally sub- 

 contracted, and the sporangia produced in a continuous 

 line parallel with and between each two of the primary 

 veins ; this linear form of the sori may readily be conceived 

 to be formed by the complete confluence or union of the 

 normal punotiform receptacles of such species as Pletiridiam 

 crassifolium or P. crassinervum ; indeed, it is dilEcult to 



