HOW TO KNOW THE SEAWEEDS 



69b Filaments free, not held together by special hranchlets, although 

 sometimes somewhat twisted 70 



70a Cell walls present at the base of each branch. Fig. 102 



Cladophora 



Fig. 102. Cladophora spp. 



A. Cladophora trichoto- 

 ma (C. Agardh) Kiitzing. 

 A small upper, branched 

 portion of a plant, X 25. 

 A common, coarse, tufted 

 species along the Pacific 

 Coast. A dozen or more 

 other species may be en- 

 countered along the Pa- 

 cific and may be identi- 

 fied through the use of 

 keys in Setchell & Gard- 

 ner, 1920. B. Cladophora 

 cilbida (Hudson) Kiitzing. 

 A small portion of a 

 branched axis, X 50. This 

 is an example of one of 

 the several very delicate 

 forms which may be 

 found either along the 

 Atlantic or Pacific coasts. 

 This one, although so deli- 

 cate, may reach 10 cm. 

 in height. 



Figure 102 



79 



