168 C R Y P T G A M I A. 



Sargassum folyphy-llum, J. Ag. I. c. Sandwich Islands. 



Sargassum parvifolium, Ag. Tongatabu. 



Chnoospora pannosa, J. Ag. Eimeo, Society Islands. 



Dictyota acutiloba, J. Ag. Sandwich Islands. 



Dictyota bidentata, Haw. & Bail. (Vide infra, p. 173, t. 8), Feejee 

 Islands. 



Hydroclathrus cancellattjs, Bory. Sandwich and Feejee Islands. 



Asferococcus sinuosus. Ag. Sandwich and Society Islands. 



Padina pavonia, Adans. Feejee, Sandwich, Society, Tonga, and 

 Wake Islands. 



Haliseris plagiogramma, Mont. Wake and Sandwich Islands. 



Amansia glomerata, Lamour. Feejee and Sandwich Islands. 



Laurencia Fosteri, Grev.? Harv. Ner. Aastr. %)• 85. Oahu. 



Gracilaria lichenoides, Ag. Sandwich Islands. 



Gracilaria dumosa, Harv. & Bail. 



G. frondibus crassissimis dense pidvinatis diclwtomis fastigiatis teretibus 

 vel vix compressie, ramis ramulisque divaricatis, axillis rotundatls, 

 apicibus attenuatis acutis ; cystocarpiis Tiemisphcericis eparsis. 



Hab. Tongatabu. [Since gathered abundantly by Prof. Harvey at 

 the same island.] 



Fronds occurring in dense, cushion-like mats, several inches long 

 and broad. Each individual frond is three or four inches long, and 

 one or two lines in diameter, much branched and bushy; the branches 

 spreading in all directions, and very patent or even divaricate. The 

 ramification is irregularly dichotomous ; the upper branches are 

 gradually less thick; the ultimate ramuli slender and tapering to a 

 sharp point. Cystocarps occur sparingly on the larger branches. The 

 color, when growing, is a dark or blackish-purple ; but all the Expedi- 

 tion specimens have been bleached in the sun to a dirty white. The 

 substance of the plant is cartilaginous, and the frond shrinks much in 

 drying. 



