CoccocarjoecB.'] gigaetina. 231 



central placenta dense clusters of spores (favellidia) held together 

 by a net-work of fibres ; 3, tetraspores scattered among the 

 filaments of the periphery, or aggregated in dense, immersed 

 sori. — The name is from the Greek word for a grape-stone, which 

 the tubercles resemble. — Harvey. 



1. GiGARTINA PISTILLATA^ LamOllT, 



Hab. On rocks near low-water mark. Perennial. Winter. 

 Yery rare. Discovered by the Hon. Dr. Wenman in 1800. 

 Pound by Stackhouse, Brodie, Mrs. Griffiths^ ]\liss Hill, 

 Dr. M'CuUocb, Dr. Jacob, Mr. Gilbert Sanders ; by Miss 

 Turner in Jersey. It does not seem to have been procured 

 in either Scotland or Ireland. 



It is a remarkable plant ; the tubercles are large, gene- 

 rally near the point of the branch, which projects like a 

 horn ; the colour is a dull purplish or brownish red ; it does 

 not adhere to paper. A person who has seen the very correct 

 figure of it in Phyc. Brit., PL ccxxxii., could not fail to 

 know it, were he to light on so great a prize. I am glad 

 that I have even better than the figure, having received 

 specimens of this very rare plant from Professor Harvey, 

 Rev. W. S. Hore, and Dr. Cocks. 



2. GiGARTiNA ACicuLAEis, Lumour. (Plate XL fig. 42, 

 plant in fruit.) 



