the Br ill/}} Fuci, with particular Defer Iptiom of each Species. 159 



and the fegmcnts for the mofl: part acute. As the plant increafes 

 in ftature, the (harp terminations of the branches grow broader, 

 and appear fomewhat truncated. In this (late they are preparing- 

 for a frefh divifion, and each blunt fegment becomes divided into 

 two acute ones ; and th"us the increafe of the plant is carried on. 



The great point of diftindlion to be depended upon, is the ends 

 of the branches being divided into acute fcgments. In Mr. Light- 

 foot's colle6lion we faw feveral fpecimcns whofe frond had at the 

 bafe a faint nerve, exa«SHy like what is obferved in F. alatus. The 

 nerve, however, in thefe foon terminates ; but in fome fpecimens, 

 with which our friend Mr. M'Leay has favoured us, a faint nerve 

 appears to run through all the branches. They were gathered 

 near John o'Groat's houfe in Caithnefsfliire. 



This anomaly is apt to perplex the young botanift : the fame 

 irregularity is obfervable in F. rubens, 



30. Fucus BiFiDus» Tab. 17. Fig. r. 



F. frondibus merabranaceis dilatatis bifidis, fegmentis divaricatis 

 obtufis ; tuberculis marginalibus diftantibus. Fl. Ang. p. 581.. 

 Withering, vol. 3, p. 247. 

 Habitat in rupibus et faxis marinis apud Cromer in Norfolcia. 

 Adhccret faxis et lapillis radice fibrosa — Frondes a radice plures, a 

 tenui principio ftatim latefcentes ; fingulae i — 2 unciales, membra- 

 naceae, tenerrimae, last^ rubrse, pro altitudine bis, 3 — 4 bifida, feg- 

 mentis 1 — 3 lineas latis, fub-divaricatis, unde cuneiformes appa- 

 rent ; terminationes plerumque obtufje, raro acutiufcula^ — Frudlifi- 

 catio, tubercula fphaerica, parva admodum, atro-purpurea, rara» 

 diftantia, in ipfo margine frondis, feminibus minutiffimis repleta. 



This 



