THE MARINE BOTANIST. 251 



mer. Dingle and Roundstone Bay, West of Ire- 

 land. Torquay. Plymouth, Mr. Boswarva. 



CERAMIUM NODOSUM.— WIDE-FORKED 

 TRINSPARENT-JOINTED CERAMIUM. 



Fronds three to six inches long, as fine as human 

 hair, or more slender, forming globular, fastigiate 

 tufts, repeatedly dichotomous, with very patent 

 axils, of nearly equal diameter throughout. Dis- 

 sepiments swollen, dark-coloured ; articulations 

 colourless. Substance rigid and harsh to the 

 touch when recent. In drying it adheres but 

 imperfectly to paper. The wide-spread forkings of 

 the branches and harsher substance distinguish 

 this species from the following. Grows on sandy 

 shores, often at the roots of Zostera. Annual. Sum- 

 mer. Dublin Bay. Ireland's Eye. Bangor and 

 Newcastle, Co. Down. Howth. Rathmullar. 

 Roundstone Bay, Cunnemara. Isle of Wight. 

 Meadfoot, near Torquay. Plymouth. Falmouth. 



