CHARACTERS OF TRIBES AND GENERA. 153 
smooth, flaccid, pinns 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, Thunb. 
Illust. Fée Gen. Fil., t. 15, A; Moore Ind. Fil., p. 47, A: 
J. Sm. Ferns, Brit. and For., fig. 53;' Hook. Syn. Fil., 
t. 6, fig. 52, c. 
Ozs.—This genus differs from the preceding chiefly in 
habit and in the venation being more uniform reticulated. 
Sp. D. japonica, Fée (v v.) (Gymnogramma japonica, Kze. 
in Schk. Fil. Suppl., t. 116). 
Native of Japan. 
67.—Tanitis, Willd. (1806). 
Vernation uniserial, sub-fasciculate. Fronds contiguous, 
long stipitate, smooth, firm, coriaceous, 1 to 2 feet in length ; 
pinne 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. Teenitis blechnoides, Sw. 
Illust. Hook. and Bauer. Gen. Fil, t. 77, B.; Moore ` 
Ind. Fil, p. 17, A.; Hook. Syn. Fil., t. 6, fig. 57. 
Oss.—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, 3 
. transverse, medial sorus, but in some the line is interrupted, - 
and then constitutes Tænitis interrupta of Hooker and ` 
