148 Dr. Goodenough and Mr, WoodwardV Olfervations on 



Var. 0. Integer — ramis margine integerrimo, apicibus ovatis ot> 

 tufiufculis. Buddie, p. 6. n. I. Donati Adriatic, p. 34. t. j» 

 Morifon, Hi ft. Ox. 3./. 15. U 8./. IO. 



F. fpiralis y* Ft. Scot. p. 912. 



F. veficulofus [2. Fl. Ang. p. 577. Withering, vol. 3. p. 242, 



Habitat in rupibus et faxis marinis. 



Radix callus expanfus — From 4-uncialis dodrantalis et ultra, 

 alata, inferne fsepius membranis orba — Rami in a latiorcs, margini- 

 bus undulatis, apicibufque tumidis et obtufis — in /3 anguftiores^ 

 marginibus integerrimis, apicibufque valde tumidis ovatis, et non- 

 nunquam acutiufculis— Habitus F. veficulofi, at veficulis omniriO; 

 caret — Mod© fpiraliter contorta, modo. omnino plana — Color oliva- 

 ceus — Subjiantia membranacea. 



F'ucus fpiralis has entirely the habit of F. veficulofus. It is how- 

 ever readily diftinguifhed from it by its being entirely free from 

 bladders. If there fhould be any danger of confounding it with 

 ~F. ceranoides, that difficulty may be avoided by obferving, that in 

 fpiralis the ends of the branches are very much fwelled and obtufe 

 — and in ceranoides, they are but (lightly tumid, and extremely 

 acute. 



Our firft variety exactly acords with Linnaeus's and Mr. Light- 

 foot's fpecimens. The margins of the branches appear fomewhat 

 undulated. The lower parts of the plant are apt to lofe the mem- 

 brane ; neither does it ufually make any attempt to repair the in- 

 jury, as veficulofus and ceranoides do : the ends of the branches are not 

 fo very tumid as in the var. /3. The branches towards the top of the 

 plant where the membrane is entire, are from \ to ~ of an inch broad. 



In our var. /?, the branches have their margin entire. The 

 membrane of the lower parts of the plant is alike torn off by the 



violence 



