CRYPTOGAMIA ALGJE, 917 



This is generally about two inches long, the fcg- 

 ments half an inch, and fometimes an inch 

 vt-ide, commonly not more than twice divided ; 

 the ftalk narrow, and often filiform at the bafe; 

 but what more particularly diRinguifhes this 

 variety is, that both fiirfaces of the leaf are 

 covered all over with numerous fmall wart-like 

 cxcrefcences, or fhort proliferous ligaments, 

 which are in reality a kind of feed-vefiels; for 

 we have often obferv'd a red fpot within them, 

 confifting of minute feeds. 



There is yet another variety of this warted kind, 

 the leaves of which are four or five inches 

 long, much more branched, and the fegments 

 only one-fixth or one-eighth of an inch wide; 

 but in other refpefls like the foregoing. 



Narrow-leav'd warted Buckfliorn Fucus. Anglis. 



On the rocks of Cramond ifland, in the Forth. 

 VII. 



All the other varieties which we have obferv'd 

 may be reduced to one or other of the above 

 defcribed. 



F. fronde plana dichotoma integerrima canalicu- 

 lata lineari, fruclificationibus tuberculatis bi- 

 partitis obtufis. Syft. nat. 'edit, i^.^p. 812. 

 FUCUS excifus. Sp. pi. 1627. n. 10. et Hudf. 

 4ngl.p. 468. {Moris, hijl, Oy. feci. 15. t.%. 

 N n n 3 /. 12. 



