CHARACTERS OF TRIBES AND GENERA, 287 
chium. The multifid character of the fronds induces me to 
place it in Cheilanthee. 
Sp. O. auratum, Kaulf. (v ei: O. Japonicum, Kunze. 
(Leptostigia lucida, Don.) (v v.); O. melanolepis, Kze. ; O. 
strictum, Kze. 
The three first are natives individually of Arabia, India, 
and Japan, and the fourth of Cuba. 
162,—Ocropreris, J. Sm. (1841). 
Hook. Sp. Fil. 
Vernation decumbent. Fronds contiguous, long stipate, 
deltoid, decompound, 2 to 3 feet high, smooth glossy ; stipes 
and rachis pale, stramineous; ultimate pinnules and lobes 
oblong elliptical, cuneiform, marginate, usually oblique. 
Veins pinnately forked, radiating ; venules direct, apices of 
the sterile clavate, free, the fertile 2 to 4 converging, and 
transversely combined by a thick, impressed, sporangiferous, - 
marginal receptacle. Sori oblong, rarely two on each lobe. 
Indusium formed of the reflexed margin, thick, coriaceous. 
Type. Adiantum pallens, Swartz. 
Illust. Hook. and Bauer Gen. Fil., t. 106, A. ; Moore 
Ind. Fil., p. 29, A. ; J. Sm. Ferns Brit. and For., fig. 
94; Hook. Syn. Fil., t. 2, fig, 22. 
Ups, This genus is founded on a solitary species of very 
distinct habit, a native of Mauritius. It was originally 
placed by Swartz in Adiantum, but it is readily distinguished 
from that genus by the sporangia being seated in the axis of 
the reflexed indusium and not on its disc, while the conver- 
gence of the fertile venules distinguishes it from Pteris. 
Sp. O. pallens, J. Sm. (v v.), Hook. Sp. Fil., 2, t. 77, B. 
