CONFERVA VESICATA. 



C. filamentis ramofis fub-articulatis, rigidis, veficulis innatis folitariis 

 ellipticis, filamento latioribus, capfulis fubdidymis pyriformibus, bre- 

 viter pcdunculatis. 



C. veficata. Muller in Nov. Adl. Pet. III. 

 C. burfata ? Muller in Nov. Aft. Pet. III. 



In Fifh Ponds at Knowle Park, and in a Stone Trough at the three mile ftone on 

 the Pensford Road, near Briflol. W. IV. Young. 



MY Friend W. W. Young brought me the prefent interefting fpecies from 

 the neighbourhood of Briftol, and it fo ftrikingly agrees with Muller's figure and 

 defcription, as to leave no doubt of its being his C. veficata. It grows in large 

 bufhy maffes at the bottom of the water. The filaments are fo exceffively brittle 

 that it is almoft impoffible to afcertain their length. They are cylindrical, every 

 where Huffed with minute granules which iffue from them when broken, and 

 very rough to the touch ; the branches are few, difpofed at a great diftance from 

 each other, and generally from an obtufe angle with the Mem. The ftems and 

 branches at irregular intervals are frequently fwollen into bladder-like veficles, 

 four or five times broader than the filaments, and bearing a confiderable refem- 

 blance to thofe of Fucus nodofus. I obferved one of their veficles at the termi- 

 nation of a fmall branch, as is reprefented in the figure, but, as Muller obfervcs, 

 I believe thefe very rarely occur. The diffepiments appear very irregularly, though 

 always at a great diftance from each other, and towards them the joints are 

 contracted at both ends ; the capfules are pear-fhaped, lateral, on fhort footftalks, 

 and delicately reticulated with nerves ; they are generally difpofed in pairs ; 



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