( (57 ) 



moss, where it was for sonic time collected along with Gigartina 

 mamillosa, and was at one time so much in demand that it was sold at 

 from two or three shillings per pound. The three figures given are 

 what might be called the most common foi'ms this most variable plant 

 assumes. We might have given some dozen figiires withoiit exhausting 

 the specimens now before us, each distinct. 



EXPLANATION OF PLATE XCL a, b, c. 



Figs. l.A, B,c. — Chondrus crispm, natural sizes. 

 2. — Section of frond and two sori. 

 3. — Tetraspores from same. Both magnified. 



