ALGiE. 173 



[A second reputed species of this genus is described and figured in 

 Harvey, Ner. Bor. Amer. 3, p. 30-40, but that may possibly be a 

 Derbesia. W. H. H.] 



PHILIPPINE ISLANDS. 



Sargassum spinifex, Ag. ; J. Ag. Sp. l\ p. 312. 



TURBINAEIA DENUDATA, Bory ; J. Ag. 1. C. p. 266. 



Padina pavonia, Linn. ; J. Ag. I. c. p. 113. 



Dictyota bidentata, Harv. & Bail. tab. 8, /. 6, 7. 



D. fronde basi vix stuposa cuneata pluries dichotoma, segmentis sursum 

 latioribus, sinubus rotandatis, apicibus junioribus acute bidentatis, 

 areolis rectangularibus ; soris minutissimis per totam paginam frond is 

 sparsis. 



Hab. Mindanao. 



Frond 6 to 8 inches long, one-fourth of an inch broad, cuneate 

 below ; the segments broader upwards, dichotomous, membranaceous ; 

 their apices acutely bidentate, the teeth angular, but not acuminate. 

 Sori extremely minute, dot-like, scattered over the whole surface of 

 the older parts of the frond. 



Nearly allied to D. Bartayresiana, but broader, with less acuminate 

 tips and smaller sori. 



Laurencia papillosa, Qrev.; J. Ag. Sp. 2, p. 756. 



Halimeda triloba, Decaisne ?. (Specimens imperfect.) 



u 



