CHARACTERS OF TRIBES AND GENERA. 101 



nacea (Don.) (v v.) (0. undulata, J. Sm.) ; C. longissiraa 

 (Bl.) ; C. Zippelii (BL) ; C. Samarense, /. Sm. (Diblemma, 

 J. Sm. 1841) ; C. tenulorus, /. Sm. ; C. superficial (Bl.) ; 

 C. erioides (Poir.) (Microsorum erioides, Link.) 



** Fronds lobed or pinnatifid. 



C. tridactylon (Wall.) ; C. Labrusca (Hook.) ; C. spec- 

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

 affine (Bl.) 



17. SELLIGUEA, BORT. (1829). 

 Grammites, Blume ; Gymnogramma, Hook. Sp. Fil. 



Surculum slender, elongating, epigeous, and squaraose, 

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

 long, simple, linear lanceolate or broad elliptical, rarely 

 pinnatifid, smooth, opaque, the fertile longer than the 

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

 straight. Venules compound anastomosing, with free vein- 

 lets terminating in the areoles. Receptacles compital, 

 elongated, oblique, forming a continuous or sub-interrupted 

 linear sorus between the primary veins. 



Type. Selliguea Feei, Bory. 



Illust. Hook. Grev. Ic. Fil. t. 5 and 6; Hook. Bot. 

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

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



OBS. The species comprehended under this genus agree 

 in many respects with Pleuridium, 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 punctiform receptacles of such species as Pleuridium 

 crassifolium or P. crassinervum ; indeed, it is difficult fco 



