the Briti/l: Fad, with particular "Dcfcrip lions of each Species, 



211 



This fpecies is diftinguifhed from confewoides by its fhortcr 

 growth — by being more branched, the branches ufually pointing one 

 way, and the (mailer ones attenuated at their bafc — and by the larger 

 frze and different fhape of the tubercles; which when mature are 

 depreffed and umbilicated, exactly refembling the ihiclds of fome 

 Lichens. From purpurafcens it differs fufficiently in having lateral 

 tubercles, and, as before mentioned, its branches pointing one way. 

 It is unnecelTary to point out any diftinclions from the reft of this 

 divifion. 



The principal branches, which feparate almoft immediately from 

 the root, and generally in a dichotomous form, are in this plant 

 furniihed with very numerous fecondary branches, growing moftly 

 from the upper fide, and thefe are again befet with fmaller : thefc 

 branches are always fmaller towards the bafc ; arifing as it were 

 from a point, and then fwclling; and are again tapered towards 

 the fummit. The fructification has been fully defcribed. The 

 colour is generally whitifh, but fomctimes with a tinge of brown or 



purple. 



It is well defcribed by Gmeliu, p. 136 j but the figure is not equal ; 

 the tubercles being reprefented too fmall, and the twilled appearance 

 beino- probably the effect of drying. Mr. Hudfon has referred to 

 albus Gm. p* 138, as well as to verrucofus ; but the former i-s defcribed 

 as having the tubercles all axillary, and muft therefore be a dif- 

 ferent fpecies. He alfo refers to R. Syn. 50. \ F. teres albus tenu- 

 i/Jime divifusj which is clearly purpurafcens ; the fructification being 

 defcribed as furrounding the branch, and not lateral, as in this 

 fpecies. We cannot find any fpecies in Ray fuinciently certain to 



be quoted. 



It adheres by its ftrong cartilagineous fibres to the rocks at Wey- 

 mouth and Chriftchurch, and elfewhere on the fouthern coaft ; 



E e 2 and 



