tended, containing few scaphidia. Colour a dark olive, becoming black in 
the herbarium. Substance coriaceous, flaccid and tough. 
Ree eee 
This species seems to oscillate between the true Cystophore 
and the species of Sargassum with filiform and dichotomous 
leaves; but the position of the receptacles, which are formed 
out of the terminal ramuli of the branches, ought to fix it as a 
species of Cystophora. By Sonder it was referred, though with 
doubt, to the little known Fucus flaccidus of Labillardicre, which 
appears however to differ in its much larger and perfectly sphe- 
rical muticous vesicles. 
Fig. 1. Portion of the middle region of the stem of Cystophora Sonderi, with 
lateral branches. 2. The discoid root :—oth of the natural size. 3. Part 
of a pinnule, bearing vesicles. 4. Part of a pinnule, with receptacles :— 
both magnified. 
