BROWN AND RED ALGJE. 



II 9 



Rhodophycex (rhabdonia, gracillaria, callithamnion, champia, 



etc.). The red alga. 



274. Some of the protococcoidese are believed to lie very near 



some of the lower animals like the flagellates. They are mostly 

 single-celled plants ; some of them are 

 motile during the vegetative stage, and 

 others are not motile, while others are 



Fig. 128. 

 Rhabdonia.branched 

 portion of frond show- 

 ing cystocarps. 



Fig. 129. 



Section of cystocarp of rhabdonia, showing 

 spores. 



motile during certain stages. The red-snow plant 



may be obtained by scraping the red-looking 



matter out of the bottom of dry shallow basins in 



the rocks, close by fresh-water streams or lakes. 



By placing some of this material in a vessel of 



water for a few days the motile stage may be 



obtained. The protococcus, or Pleurococcus vul- tococcus) vulgaris 



garis, may be obtained on the north side of trees, rocks, and 



walls, in damp places. 



Fig. 130. 

 Pleurococcus (pro- 



