HOW TO KNOW THE SEAWEEDS 



18b Cortex bearing conspicuous superficial hairs, filaments, or para- 

 physes. Fig. 30 19 



Fig. 30. Chorda filum (Linnaeus) Lam- 

 ouroux 



Part of a transaction of a thallus 

 to show the parenchymatous struc- 

 ture and the presence of conspicu- 

 ous superficial hairs. For habit and 

 other comments see Figure 32. 



Figure 30 



19a Thallus subdichotomously branched; cortex bearing arcuate fila- 

 ments in clumps. Fig. 31 Stilophora rhizoides 



Fig. 31. Stilophora rhizoides (Ehrhart) J. 

 Agardh 



The upper part of a plant to show the 

 rough surface due to clumps of hairs, and 

 the loose, remote branches, X 1.2. This 

 is the only species of the genus on our 

 coasts. It occurs in quiet bays from North 

 Carolina northward to New England. 



Figure 31 



37 



