142 CHARACTERS OF TRIBES AND GENERA. 
This remarkable Fern has as yet only been found in the 
island of Leyte, Philippines. 
Sp. A. articulata, J. Sm. (Acrostichum Wilkesianum, Hook., 
is probably the same ; it is a native of New Caledonia and 
Society islands and shows that Æ. articulata has a wider 
range than the island of Leyte). 
** Veins anastomosing in various ways. 
57.—Crrrogonium, J. Sm. in part. (1841). 
Acrostichum sp., auct.; Hook. Sp. Fil. 
Vernation uniserial, sarmentum slender scandent. Fronds 
pinnate, 1 to 24 feet long, pinns linear, lanceolate, acumi- 
nate, crenate-serrate, petiolate, articulate with the rachis. . 
Veins short, pinnate, venules anastomosing, the costal 
areoles trigonal, larger than the exterior ones, which are 
obliquely rhomboid. Fertile pinne contracted. Receptacles — 
confined to the concentrated venules, forming reticulated 
lines of confluent sporangia. 
Type. Acrostichum serratifolium, Mert. 
Illust. Schotts. Gen. Fil, t. 12; Hook. and Bauer, Gen. 
Fil, t. 81, B; Fée's Acrost., p. 94, t. 55, fig. 3. 
Oss.—Oyrtogoniwm, as originally characterised, included ` 
species of Pecilopteris, but as now restricted it is distin- - 
guished by the pinnæ being articulate with the rachis. 
Sp. C. serratifolium (Mert.) (O. fraeinifolium Hook. and 
Bauer.) ; C. scandens (Radd. Fil. Bras., t. 18) (4. Rad- 
 dianum, Kze.); C. pinnata J. Sm. (Neurocallis, Moore 
Ind. Fil.) 7 
The two first are natives of Brazil, and the last of 
India. 
