H 
CHARACTERS OF TRIBES AND GENERA. 269 ` 
150.—Opontotoma, J. Sm. (1841). 
Davallia and Lindsea, sp. auct. ; Hook. Sp. Fil. 
Vernation uniserial, sarmentose, epiphytal. Fronds slender, 
1 to 2 feet high, 1 to 2 pinnate; pinne and pinnules oblong, 
dimediate, the upper margin entire, dentate or incise lobed. 
Coste eccentric. Veins unilateral; vennules direct, free. 
Receptacles terminal, punctiform. Sori round. Indusiwm 
sub-reniform, plane, its sides free, shorter than the sub- 
induseeform margin. 
Type. Dicksonia repens, Bory. 
Illust. Hook. and Bauer, Gen. Fil, t. 114, B. ; Hook. 
and Grev., Ic, Fil., t. 143. 
Oss.—Odontoloma having punctiform marginal sori 
similar to that of Davallia, has led the species to be placed ` 
br most authors in that genus, but the eccentric costa 
clearly shows its affinity to be with Lindsca, with which it ` 
also agrees in habit, only separated by the sori being 
punctiform, not linear and continuous as in true Lindsea. 
The genus consists of about half a dozen known species, (od 
they are widely distributed in or near the tropics, being 
represented in Guiana, the Mauritius, Malayan, Fiji, Sand- 
wich, Philippine, and Polynesian Islands. 
Sp. O. pulchella, J. Sm. ; O. repens (Sw.); O. Macræ- 
| ana (Hook. and Arn.) (0. Hookeri, J. Sm., 1841) ; O. Parkeri 
(Hook.); O. fijiensis, J. Sm., in Seemann’s list of Figi 
Plants; O. tenuifolia (Bl.); O. hymenophylloides (Bl) ; 
O. triquetra (BI.). 
Ons.—Odontoloma repens affords a good example of the 
different views entertained by Pteridologists in defining 
the technical character of genera on the sori alone; this 
Species is epiphytal, having a slender sarmentum and linear ` 
pinnate fronds, a foot or more in length, with dimediate — 
