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 A. articulata has a wider 

 range than the island of Leyte). 



** Veins anastomosing in various ways. 



57. CYRTOGONIUM. J". Sm. in part. (1841). 

 Acrostichum sp., auct. Hook. Sp. Fil. 



Vernation uniserial, sarmentum slender scandent. Fronds 

 pinnate, 1 to 2 feet long, pinnse 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 pinnce 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 ; Fee's Acrost., p. 94, t. 55, fig. 3. 



OBS. Gyrtogonium, as originally characterised, included 

 species of Pcecilopteris, but as now restricted it is distin- 

 guished by the pinnee being articulate with the rachis. 



Sp. C. serratifolium (Mert.} (G. fraxinifolium Hook, and 

 Bauer.) C. scandens (RaJd. Fil Bras., t. 18) (A. Ead- 

 dianum, Kze.) ; C. pinnata J. Sm. (Neurocallis, Moore 

 Ind. Fil.) 



The two first are natives of Brazil, and the last of 

 India. 



