HOW TO KNOW THE SEAWEEDS 



73b Reproductive organs lateral or terminal on the filaments. Fig. 106. 

 Ectocarpus 



Fig. 106. Ectocarpus spp. 



Figure 106 



Three different exam- 

 ples of types of plurilo- 

 cular sporangia charac- 

 teristic of Ectocarpus axe 

 shown (A-B. X 200; C, X 

 225). In C the stippled 

 cells indicate those in 

 which intercalary division 

 has most recently occur- 

 red. Ectocarpus is a large 

 genus of relatively small 

 plants. One or more spe- 

 cies may be found almost 

 anyvvhere, often as epi- 

 phytes, but except for a 

 few kinds they do not 

 reach conspicuous size. 

 The local floras must be 

 used for the identification 

 of species. 



82 



