BROWN AND RED ALG^. 



119 



Rkodophycem (rhabdonia, gracillaria, callithamnion, champia, 



etc.). The red algae. 



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- 

 garis, ma3' be obtained on the north side of trees, rocks, and 

 walls, in damp places. 



Fig. 130. 

 Pleurococcus (pro- 

 tococcus) \ulgaris. 



