CHARACTERS OF TRIBES AND GENERA. 95 
three sections, namely, Euphymatodes, Pleuridium, and 
Drynaria. Under Pleuridium he places sixteen species, 
which although they all agree in having compound vena- 
. tion and compital sori, nevertheless as they differ in habit, 
 lrestrict the species to those bearing the above character. 
* Sori oblique uniserial. 
P. crassifolium, (Linn), (v v.); P. albo-punctissimum 
(Lindews Cat.) (v v.); P. crassinervam (Bl.) (v VE Ee e 
vuleanicum CDI? S 
** Sori oblique biserial. 
P. rupestre (Bl) (v v); P. triquetram (Bl. ) (vv.) a 
The two first are natives of West Indies and Tropical 
vedi the others of Malay and Philippine Islands. 
ti Cels a eae Presl (1836). a 
Cyrtophlebium, R. Br. ; J. Sm. Gen. Fil., 1841 ; Polypodium, — 
S sp. auct. Hook. Sp Fil, 
Sureulum short, cæspitose, or elongated, often sub- 
Ypogeous. Fronds simple, linear lanceolate or broad 
liptical, or pinnate, firm, rigid, 1 to 2 feet high. Primary ` ` 
veins costeform or undefined, elevated, or internal and a 
obscure, Venules arcuately or angularly transversely anas- 
tomosing, producing two or more excurrent free veinlets, 2 
Uniform, or sometimes irregular. Receptacles punotiform, S 
terminal, or medial on the free veiniets. Sori round, a 
oblique biserial, or irregular, destitute of GER : pu 
ype. Polypodium repens, Linn. EH 
lust.—Hook. and Bauer., Gen. Fil. t. 71 A. Mor, na. 7 
- Fil. p. 60; J. Sm. Ferns, Brit. and For, fig. 27; Hook. 
‘Syn. Fil. t. 5, fig. 48, j. 7 
—This genus consists of about a | dozen described 
