the B'rilijh Fucf 9 ivith particular Defer ipticns of each Species. 1S3 



out fmall branches more or lefs horizontal and obtufc : the varia- 

 tion conn lis in the breadth or finenefs of the principal branches,, 

 and the proportion which they bear to each other. The difference 

 of foil' and fituation mod likely occafions this variety of appearance. 



We found the two firft varieties, both fmall in their kind, on the 

 rocks near Exmouth in Devonshire — the van « on the edges of 

 the little cavities of the rocks under the coarfer forts, viz. F.ferratus, 

 veJtculofus i &c. — the var. (B was a little more expofed. The third var. 

 we have found only on the extremity of the Ifle of Portland near 

 the lighthoufes — the fourth near Ilfracombe, where it is very plen- 

 tiful. All thefe varieties are re*adily kept diftin<5l from obtufus by 

 their extreme branches being obtuie and entire, and not truncated. 



Thefpeeknens preferved in Buddie are large, and, being blanched, 

 fo juftly anfwer his defcriptioa of corneus et tenax, that we preferve 

 the name corneus. The propriety of this appellation is feen only in 

 thefe larger and thicker fpecimens. Mr. Lightfoot does not appear 

 to have {een it otherwife than in its fmaller ftate, fuch as it appears 

 in our fecond variety. He called it nereideus, from its fimilarity to 

 the Nereis, an animal claffed by Linnaeus among the Mollufca. 



It is a great argument, we own, for thefe varieties being feparated 

 into diftinct fpecies, that they are found growing in fuch diftant 

 fituations, and fo detached from each other ; but their limits are 

 not to be afcertained. 



We have not obferved any fructification upon the two lafl: 

 varieties. 



43. Fucus GrGARTiNus— Tab. 17. Fig. 3, 4. 



F. fronde cartilaginea dichotoma ramofa, ramis asqualibus 

 acutis fpinofo-dentatis ; tuberculis globofis lateralibus 

 feffilibus. Herb. Linn. Murray Syjl. Veg*p.tyi* 



Habitat 



