Rhodomelece.'] polysiphonia. 299 



filum at the mouth of the harl^our, and^ prepared when 

 quite fresh, it makes a beautiful specimen. In fresh water 

 it very soon decomposes. There is a fine figure of it in 

 Phyc. Brit._, PL ccviii., and magnified specimens of three 

 kinds of fruit, ceramidia, tetraspores, and antlieridia, the 

 last of which, viz., autheridia, are often clustered round the 

 tips of the branches, " crowning every branchlet with a tuft 

 of golden fruit. ^' 



19. POLYSIPHONIA PULVINATA, Spvenff. 



Hab. On rocks in the sea, and in rock-pools. Annual. 

 Mrs. Griffiths, Torbay ; Land's End, Mr. Ralfs ; Miltown 

 Malbay, Professor Harvey; Miss Gower, Balbriggan; Mr. 

 D. Moore, Port Stewart; Ardrossan, Major Martin; Salt- 

 coats, D. L., jun. 



It resembles Poli/sipJionia urceolata in miniature. It is 

 not only smaller but softer, and the branchlets are more 

 closely crowded. See figure in Phyc. Brit., PI. cii. 



20. PoLYSiPHONiA URCEOLATA, GrevUle. 



Hab. On rocks and on the stems of Lamhiaria digitata. 

 Annual. Summer. Growing on Laminaria it becomes 

 rigid when full grown, and does not adhere to paper in 

 drying. What grows on rock, is with us less rigid, darker 

 coloured, and decomposes more readily in fresh water. 



