

CONFERVA YOUNGANA. 



C. filamentis caefpitofis, fimplicibus, rigidiufculis, apicibus obtufis ; 

 diffepimentis contracts ; articulis breviufculis, aduhioribus fubno- 

 dofis ; fuccus in globulos folitarios demum congeftus. 



On the Lime-Stone Rocks near Dunraven Caftle, Glamorganfliire. W. W. 

 Young. — On the Piles of the Jetty at Great Yarmouth, and Cromer, Norfolk. 

 W. J. Heeler, Efq. 



THE prefent fpecies was firft difcovered by Mr. William Wefton Young, 

 A.L.S. in honor of whom I have named it, as a token of my private friendfhip, 

 and as a public acknowledgment of the ailiftance which this work has received 

 from his accurate pencil. 



C. youngana grows very plentifully on the limeftone rocks about Dunraven, 

 frequently in fuch places as are never covered by the fea, and only warned by 

 the fpray at high water; and Mr. Young tells me that it never grows much 

 lower than high water mark, or where it is not left expofed to the air during 

 the greater part of the day. The fituations in which Meflrs. Turner and Hooker 

 have found it at Yarmouth and Cromer are in this refpeft fimilar. It forms 

 elegant little tufts, ufually about a quarter of an inch in leng;h, and of a dark 

 green color. The filaments are fimple, fomewhat rigid, obtufe at the apices, 

 and when the plant is at maturity they become contracted at each diffepiment. 

 The length of the joint varies confiderably in different filaments, being fome- 

 times only equal to and at others double the diameter. In the young plants 

 thefe joints are nearly of the fame color throughout, but with age they become 

 more pellucid towards the diffepiments, and at length the green matter collapfes 

 into a globule which fometimes difappears, and leaves the filaments perfectly 

 colorless. 

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