148 Dr. GoODENOUGH and Mr. WoodwARdV Ohfcrvaiions on 



Var. ,5. integer — ramis margiae intcgerrimo, apicibus ovatis ob- 

 tufiiirculis. Buddie, />. 6. ;/. I. Donali Adriatic, p. 34. /. 3. 

 Morifoti, Hip. Ox. 3./ 15. /. 8./ 10. 



F. fpiralis y. Fl. Scot. p.. 912. 



F. veficulofus /3. Fl. Aig. p. 577. JVitheringy voL 3. p. 24-2. 



Hiibitat in rupibus et laxis marinis. 



Radix callus expanfus — Frons 4-uncialis dodrantalis et ultra> 

 alata, infcme fepiiis membranis orba — Rami in a latiorcs, margini- 

 bus undulatis, aplcibufque tumidis et obtufis — in /3 anguftiores, 

 maiginibiis integerrimis, apicibufque valde tumidis ovatis, et non- 

 nunquani acutiufculis — Habitus F. veficulofi, at veficulis omnino. 

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

 ceus — Subjlantla membranacea. 



Yxxzwi fpiralis has entirely the habit of F^ vejiculofus. 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 flightly tumid, and extremely 

 acute. 



Our firft variety exadly 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. /5, the branches have their margin entire. The 

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



violence; 



