964 CRYPTOGAMIA ALG.E. 



that of a thick whip-cord ; fmallefl: at the bafe 

 and lummit •, fmooth on the outfide, full of 

 mucus within-, often twifted, and always in- 

 tercepted by numerous tranfverfe diaphragms, 

 vifible when the plant is held between the eye 

 and the light. 



The frudlifications have not yet been difcovered ; 

 but from the tranfverfe fepta in its ftru6lure, 

 it is reafonable to fuppofe this plant to belongs 

 rather to the genus of CONFERVA than that 

 ofFUCUS. 



The ftalks fkinn'd when half dry, and twifted, 

 acquire lo confiderable a degree of flrength 

 and toughnefs, that we were inform'd the High- 

 landers fometimes ufed them for the fame in- 

 tentions as Indiangrafs. 



pygw^us F. fronde cartilaginea comprefTa apice dijatata 



43' palmata, fructificationibus terminalibus fubro- 



tundis apice perforatis. — Nova fpecies. (Vid. 



fig. nojl.) 



Pigmy Fucus. Anglis. 



The rocks of the Little Ifies of Jura, which are 



_ . wafh'd by the tides, are fome of them rendered 



almoft black with this Fucus, which covers 



ihem as LICHENS do the inland rocks and 



trunks of trees. We obferv'd it alfo on the 



coaft of Jona, and in tlie Frith of Forth, and 



feveral other places. VIII. 



The 



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