HOW TO KNOW THE SEAWEEDS 



88a Thallus regularly constricted and with diaphragms at the con- 

 strictions. Fig. 123 Champia 



Figure 1 23 



Fig. 123. Champia parvula (C Agardh) Harvey 



A portion of a plant of caespitose form showing the constrictions 

 of the thallus at the diaphragms, X 7. This species is frequent along 

 the Atlantic coast from Florida to Cape Cod, usually in dense tufts 3-7 

 cm. tall. The more strongly constricted C. salicornioides Harvey may 

 be found in Florida. 



88b Thallus smooth, or if constricted, without diaphragms 89 



94 



