21 



quently obforved, as he defcribes them, ifTuing from the older filaments : thefc 

 he attributes to the germination of feeds which have infinuated themfelves from 

 the interior to the fubftance of the frond, and thus grow parafitically on their 

 parent. M. Vaucher does not feem to have noticed the minute hair-like pro- 

 cefies that iflue externally from the protuberances, between which and the 

 beaded threads on the infide, I have not been able to difcover any connection . 

 Upon the fubject of thefe difcoveries as to the ftrudture and fructification of 

 the Pohfpermit, though I have here quoted M. Vaucher alone, having myfelf 

 had an opportunity of confulting no work but his, yet I feel it incumbent upon 

 me to fay, that the concurring teftimony of German Botanifts attributes the 

 original detection of them to the late Dr. Mohr, who appears from what is 

 find by Dr. Roth, to have given an ample account of them in a number of 

 Schroder's Journal for 1801, of which I am not aware that there is a copy at 

 prefcnt in England. 



C. fluviatilis differs widely in habit and appearance from other Britifh Con- 

 ferva?, agreeing in its real character probably with none but C. torulofa, unlefs 

 indeed the conjecture of my friend, Mr. Turner, be well founded, that Fucus 

 pedunculitis, F. aculeatus, C. verrucofa*, and C. villcfa may belong to the fame 

 tribe. With refpett to C. glomerata, which has not the lead affinity to any of 

 thefe, M. Vaucher fays little more than that he found its joints contain nu- 

 merous minute granules, and thence concluded they were feeds. Of this, 

 although he continued his obfervations with unremitted aiTuluity for two years, 

 he could, however, obtain no further proof, than that the ftones in a river were 

 covered with fomewhat fimilar granules, which germinated and produced this 

 fpecies. He therefore determined on the arrangement of C. glomerata in this 

 genus, but candidly allows, ' C'eft bien plus l'analogie et le raifonnement que 

 les obfervations diredes, qui nous ont conduit dans les conjectures que nous 

 avons hafardees fur fon Hiftoire.' 



* I have omitted this fpecies in my fynopfis, becaufe having carefully examined its internal 

 ftrueture, I am decidedly of opinion that it has no claim whatever to a place among the Conferva;. 

 It will, I hope, appear in Mr. Turner's Hiftoria Fucorum. 



