from Dillenius's Hebarium, and original drawings in the collection of Sir Jofeph 

 Banks, is known to have been defigned for C. mutabilis, is very coarfely executed. 

 It was firft pointed out to me as a diftinct fpecies by my friend D. Turner, who 

 gathered it near Yarmouth •, and I have frnce found it in confiderable abundance 

 in moft of the pools and ditches about London. Its length varies from half an 

 inch to three inches, and its colour from a light to a dark green. The main (hoots 

 are nearly colourlefs, and formed of numerous fliort joints, contracted towards 

 each end, and containing in their middle a band of granules, which we muft fup- 

 pofe to be the fructification of the plant ; though from its near affinity to C. gela- 

 tinofa one would be rather difpofed to look for the fame fort of fruit as is found in 

 that fpecies. At their dlfiepiments, the ftems throw out fmall tufts of green ra- 

 muli, fcarcely equal to one-fourth of their thicknefs, and fo divided and fub-divided 

 into extremely minute expanding branches, as to give them a pencil-like appear- 

 ance ; in fome fpecimens they are of a compact oblong form, and in others more 

 lanceolate, with the extreme branches confiderably lengthened out. 



For the drawing I am indebted to my friend Jofeph Woods, jun. F. L. S. 



B reprefents a piece, which, though not fo beautiful as many that might have been 

 felected, we thought better calculated to give a clear idea of the plant. 



A. C. mutabilis, natural fize.' 



B. Ditto, magnified i. 



