THE T HALL US OF THE HIGHER ALGM. 



33 



algse, there exists, in addition to the green of the chloro- 

 plasts, a special coloring matter, called phycoeryth) in. To 

 the naked eye, this color overpowers the green and gives the 



FIG. 42. Upper part of a plant of Fncus vesiculosus. r, midrib of thallus ; /, 

 bladders ; .$-, swollen tips covered by numerous elevations, in each of which is a pit 

 (conceptacle) which contains many sex-oryans. Two thirds natural size. After 

 Luerssen. 



plant a pink tinge. In other red algae it is often present in 

 greater quantity and variety of hue, so that brilliant reds and 



