ULOTHRIX. 



THALLOPHYTES? ALG^J CHLOROPHYCEJE 



PRELIMINARY. 



SPECIES of Ulothrix are found in shallow running 

 water either in streams or along the banks of larger 

 bodies of water. They present the appearance of a 

 bright green fuzzy growth upon the supports on which 

 they grow. 1 



The plants may be distinguished from Cladophora, 

 which grows in similar places, by being more slippery, 

 shorter, and by being unbranched. Even with these 

 marks it is not always easy to distinguish some members 

 of the two genera, except under the microscope. 2 



When good material is found, it may be preserved by 

 the ordinary preservatives, or may be kept by drying 

 upon the stones or sticks to which it has grown. This 

 dried material may be made ready for use by placing 

 it in water for a few hours or a day before it is to be 

 used. Such material usually forms reproductive bodies 



1 Occasionally Ulothrix plants are found floating in free water. 



3 In some places it may be impossible to locate specimens of this 

 plant. When such is the case, preserved material may be had from 

 a supply house. The form is of especial importance, but if it cannot 

 be obtained, some of the features may be illustrated by the plant Cla- 

 dophora. 



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