SYNOPSIS 



BRITISH SEAWEEDS. 



ORDERS AND GENERA. 



Sub-class I. MELANOSPEEME^ or FtTCALES 



(Olive Seaweeds.) 

 Order 1. FuCACE.fi. Olive-coloured, inarticulate sea 



whose Bpores are contained in spheric i of the 



frond. 



r-vessels staikt d. 

 elgassum. Branches bearing ribbed I 



I simple. 



II. Halidrys. Frond linear, pinnate, leafless. Air* 



plurilocular. 



** Alr-r ' rsed in the frond } • 



III. Cystoseib \. Moot scutate. Frond much branched, 

 bushy. "Receptacles cellular. 



IV. Pycnophycus. Root branching. Frond cylindrical. 

 I\ ceptacles cellular. 



V. Fucus. Root scutate. Frond dichotomous. 



tacles small, filled with mucus, traversed by a 

 work of jointed threads. 



VI. 1 1 iv win \i,i \. Root Boutate. Frond cup-shaped. 



ceptacles very p-shaped, 



branched. 



B 



