CHARACTERS OF TRIBES AND GENERA. 153 



smooth, flaccid, pinnae elliptical lanceolate, 6 to 10 inches 

 long. Venation sub-uniform, reticulated, areoles sub- 

 hexogonoid, oblique. Sporangia occupying the whole of 

 the venules, forming netted sori. 



Type. Hemionitis japonica, Thurib. 



Illust. Fee Gen. Fil., 1. 15, A ; Moore Ind. Fil., p. 47, A ; 

 J. Sm. Ferns, Brit, and For., fig. 53 ; Hook. Syn. Fil., 

 t, 6, fig. 52, c. 



OBS. This genus differs from the preceding chiefly in 

 habit and in the venaiion being more uniform reticulated. 



Sp. D. japonica, Fee (v v.) (Gymnogramma japonica, Kze. 

 in SM. Fil. Suppl., t. 116). 



Native of Japan. 



67. T2ENiTis, mild. (1806). 



Vernation uniserial, sub-fasciculate. Fronds contiguous, 

 long stipitate, smooth, firm, coriaceous, 1 to 2 feet in length ; 

 pinnae 4 to 6 pairs, linear-lanceolate or elliptical-acuminate, 

 entire, 6 to 10 inches long, by 1 to 2 inches broad. Veins 

 uniform, reticulated ; areolea oblong, hexagonoid, oblique. 

 Receptacles compital, oblong, oblique coalescing, forming a 

 transverse line between the mid-rib and margin. Sporangia 

 crowded, forming a broad compound continuous, sometimes 

 interrupted, sorus. 



Type. Tcenitis llecJinoides, Sw. 



Illust. Hook, and Bauer. Gen. Fil., t. 77, B. ; Moore 

 Ind. Fil., p. 17, A. ; Hook. Syn. Fil., t. 6, fig. 57. 



OBS. This genus is founded on a single species, which 

 agrees in general habit and texture of its fronds with 

 Syngramma pinnata, but is distinguished by the sori being 

 oblique oblong, and laterally confluent, forming a compound, 

 transverse, medial sorus, but in some the line is interrupted, 

 and then constitutes Tcenitis interrupta of Hooker and 



