the Briiijh Fuel, tvith particular Defcrtptlons of each Species, 191 



gcr. 5'K^<7«r/ij cartilagineaomnlno coriacca ct tenax. ^///VWs variat 

 — ad duas ulnas. 



This Fucus is fo common and fo well known, that any longdc- 

 fcription of it muft be unneceffary : the large elliptical veflels oraii- 

 bladders, which form its mod confpicuous charadler, and from 

 which its trivial name is taken, fufiiciently diftinguifh it from all 

 other Britifh fpecies. Thefe veficles are folitary, diftant from each 

 Qthcr, much wider than the flalk, and decreafe regularly in fize 

 from the loweft to the uppermoft on each frond or branch. The 

 lower part of the frond is ufually deftitute of veficles as well as 

 leaves ; but there is always a fmall veficle above the uppermoft 

 leaves, from which the branch continues again naked to the fum- 

 mit, which is obtufe. The diftichous leaves in an advanced ftate 

 are fwelled, replete with mucus, and contain numerous tubercles, 

 each having a correfponding opening on the furface of the leaf. 



It is common on every part of the Britifh coaft, on the rocks, 

 and alfo on the piles and other wood-work of the harbours, and is 

 often adorned with large tufts oi. Conferva polymorpha^ which appears 

 particularly to attach itfelf to this fpecies of Fucus. 



The veficles vary in fize from the bignefs of a pea to that of a 

 crow's egg, and even larger. 



48. Fucus OBTUSUS. 



F. fronde cartilaginea ramofifllma, ramis ramulifque fub-oppo- 

 fitis erediufculis obtufiflimis truncatis. 

 FL j4ng. p. 586. IFither'mgy vol. 3. /. 253. 

 Habitat in rupibus et faxis marinis baud infrequens — In Infula 

 Portl and ise— prope Wey mou th— Ex mouth. 



I Radix 



r 



