CLADOPHORA. 



THALLOPHYTES; ALGM', CHLOROPHYCEJE. 



PRELIMINARY. 



THERE are many species of this plant, almost any of 

 which will be found suitable for laboratory work. Most 

 of the species grow attached to some support in moving 

 water, while a few may be found floating upon the sur- 

 face. The plants are much coarser than Ulothrix and 

 also much branched, so that they may be distinguished 

 fairly well by the eye alone. They grow well at 

 almost all times of the year. A week or more before 

 the study is to be made some vigorously growing plants 

 should be placed in a dish of water, in a rather dark 

 place, where there is a fairly constant favorable tempera- 

 ture. The water in the dish should be allowed to evap 

 orate slowly. This procedure will often cause some of the 

 cells to produce spores in a favorable condition for study. 1 



1 If satisfactory material was at hand in the study of Ulothrix, the re- 

 production of Cladophora may well be omitted since it is quite similar 

 to that of Ulothrix. 



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