POLYPODIACEiE. 53 



segments, and usually forming a single row, about equidistant between 

 the costa and margin. 



19. Drynaria vulgaris, J. Sm. 



Drynaria vulgaris, J. Sm. in Hook. Jour. Bot. 4, p. 61. 



Polypodium phymatodes, Sw. Syn. Fil. p. 30; Willd. Spec. PL 5, p. 167. 



P. grossum, Langad. & Fisch. Ic. Fil. p. 9, t. 8. 



Hab. Paumotu Islands. Tahiti, Society Islands. Samoan and 

 Feejee Islands. Tongatabu. Philippine and Mangsi Islands: on 

 rocks and trees ; frequent. 



The relationship of this to the preceding is very close ; but in the 

 following particulars it seems to differ : the whole plant is larger, the 

 fronds less coriaceous, and a little shining on the upper surface : the 

 segments are more distant, with the margin slightly recurved and not 

 so evidently thickened : the sori are larger, distant, orbicular, or ellip- 

 tical, and arranged in a single row equidistant between the costa and 

 margin ; with more or less of a tendency (apparent through a great 

 number of specimens) to bear a double row of sori on each side of the 

 costa: and in some specimens from the Feejee and Mangsi Islands 

 this row is complete : the venules are more slender, and the areoles 

 smaller. 



On the low coral islands of the Paumotu group, which are scantily 

 furnished with vegetation, and near the shores of the higher islands 

 in the Pacific Ocean, within twenty degrees of the equator, the 

 present species is of very frequent occurrence, luxuriating in barren 

 and exposed situations. 



20. Drynaria alternifolia. 



D. stipite gldbro semitereti; fronde subcoriacea prof uncle pinnatifida, 

 laciniis subalternis distantibw patentibm lineari-lanceolaiis attenuatis, 



14 



