the Britijlj Fuel, with particular Defer ipt ions of each Species, 143 



21. FUCUS SERRATUS. 



F. fronde dichotoma ferrato-dentata, apicibus planis tubercu- 

 latis obtufis. Herb. Linn. Buddie, p. 8. optima. Pctiver, 

 p. 28. n. I. Uveda/e, vol. 1. p. 2. n. 2. and p. 3. Mori/on, Hi/?. 

 Oxon. iii. / 15. t. 9. / 1. R. Syn. p. 42. n. 7. AS. Par if. 

 I7II. //. 9, IO, tf 1712 partie 2dr, pi. 3. /. 1, 2, 3, 4, 5, 7. 9. 

 Lam, £/. PL 1626. §y?. jR£ -Ay. p. 576. i7. &*. 902. 

 IVithering, vol. 3. /». 241. Stackhoufe, Ner. But. p. 1. t. 1. 

 Habitat in rupibus et faxis fubmarinis paflim. 

 Radix callus expanfus, attamen nervi quidam fuperne extant, 

 qnafi ex fibris coadunatis conftaret — From pedalis bipedalis, plana, 

 alata, dichotoma, obtufa, marginibus profunde arguteque fcrratis — 

 Per totam paginam puncta prominula fparfa — Apices obtufi, crofo- 

 dentati plani, tuberculati, tuberculis plurimis confertis, prominulis 

 -~Color olivaceus — Subjiantia cartilaginea. 



From variat ramofa et ramofiflima ; argute et crenato-ferrata ; lata 

 et angufta, at femper ferrata, apicibus obtufis planis tubeiculatis. 



There can be no difficulty in determining this fpecies, in what- 

 ever ftage of its growth it may be found. The fmgularity of its 

 root, having nerves or fibres (landing out above the iurface of the 

 callus, thus connecting the folid and fibrous rooted Fuci, the edges 

 being conftantly ferrated, and the ends of the branches plain and 

 not fwelled, are marks by which a child may diftinguiih it, This 

 fpecies never has bladders. 



The plate in Acl. Parif. 1712, which we have referred to, fhews 

 the plant in all the ftages of its growth. 



Little points are obfervable en the membranous parts of all 

 the branches. Nothing characreriftic (as w r e have obferved in our 

 preface) can be drawn from them ; for they are alike obiervable 



upon 



