HOW TO KNOW THE SEAWEEDS 



62a Branched filaments consisting of a very few large, vacuolate cells. 

 Fig. 95 Valonia (in part) 



Fig. 95. Valonia aegagropila 

 C. Agardh 



A small part of a matted 

 plant, X 3. Valonia is a tropi- 

 cal genus of several species 

 of variable form from single, 

 very large cells (See Fig. 163) 

 to clusters or coarse filaments 

 of large cells. Five species 

 may be encountered in Flori- 

 da. 



Figure 95 



62b Filaments branched or unbranched, of many cells 63 



63a Filaments unbranched, rarely branched, or with few short, simple 

 branchlets 64 



63b Filaments normally much-branched 68 



64a Cells with a single parietal, bracelet-shaped chloroplast. Fig. 96. 



Ulothrix 



Figure 96 



Fig. 96. Ulothrix implexa Kiitzing 



A small portion of a filament to show cell shape and form of the 

 chloroplast, X 600 (Note the very small diameter). 



Grows as soft, silky tufts on rocks or woodwork along both coasts. 

 There are three other species which may be encountered in our cooler, 

 northern waters. 



75 



