the Briti/h Fact, with particular Defcriptions of each Species, 173 



the folid fubftance of the plant, but rather from the margins being 

 contracted as it were, and drawn through their whole leneth to 

 one fide— fo that it has the appearance of being channelled rather 

 than the reality. However, as the appearance is conftant, we are 

 glad, in arranging fo numerous a family, to take advantage of it, and 

 eftablifh a new order founded upon this circumftance. 



This plant is found on all rocky fhores. Where it is expofed to 

 freili water, the points of the branches, as well as the branches 

 themfelves, are longer and coarfer, and the tubercles more nume- 

 rous, and confequently appear to be more tumid. We obfervcJ 

 this particularly in the river Severn. 



38. Fucus PATENS. 



F. fronde dichotoma lineari apicibus obtufiufculis planis ; tu- 

 berculis fubglobofis fparfis. 



Habitat prope Marazion in littore Cornubienfi, et apud Iifra- 

 combe in com. Devon, frequens. 



Radix callus — Frons bafi ipsa furculofa, unde plurimi caules con- 

 ferti enafcuntur — From linearis, et hinc leviter canaliculata — Rami 

 omnes dichotomi, dichotomiis patentibus — Apices ramorum plani, 

 tuberculorum immunes, obtufiufculi — Aliitiido variat 2— 6uncialis 

 —Color plerumque brunneus — Subjlantia membranacea — Fruttijicatin, 

 tubercula fubglobofa prominula per extremos ramos fpaffa. 



Obf. Habitus F. crifpi var. cvqualis, at margines ramorum longitu- 

 dinaliter levius inflexi, unde canaliculati videntur rami nee plani. 



Hitherto we have noticed this plant only at Ilfracombe in Devon- 

 fhire, and near Marazion in Cornwall. Some care is ncceflary to avoid 

 confounding it with fome of the varieties of F. crijpus. The leading 



mark 



