the Britijb Fuel, with particular Defiriptions of each Species, 1 59 



and the fegments for the mod part acute. As the plant mereafes 

 in ftature, the fharp terminations of the hranches grow broader, 

 and appear fomewhat truncated. In this ftate they are preparing 

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

 two acute ones ; and thus the increafe of the plant is carried on. 



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

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

 foot's collection we faw feveral fpecimens whofe frond had at the 

 bafe a faint nerve, exactly 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 Caithnefsfhire. 



This anomaly is apt to perplex the young botauift : the fame, 

 irregularity is obfervable in F. rubens* 



30. Fucus bifidus. Tab. 17. Fig. i, 



F. frondibus mensbranaceis dilatatis bifidis, fegmentis divaricatis- 

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

 Withering^ vol. 3, p. 247. 

 Habitat in rupibus et faxis marinis apud Cromer in Norfolcia. 

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

 tenui principio ftatim latefcentes ; fingulse 1 — 2 unciales, membra- 

 naceae, tenerrimae, laete rubra?, pro altitudine bis, 3 — 4 bifidse, feg- 

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

 rent ; terminationes plerumque obtufa?, raro acutiufcula? — Frudliji- 

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

 diftantia, in ipfo margine frondis, feminibus minutiffimis repleta. 



This 



