HOW TO KNOW THE SEAWEEDS 



21b Branches thick, not narrowed at the base, not attenuated. Fig. 

 35 Eucheuma (in part) 



Fig. 35. Eucheuma isiforme (C. Agardh) 

 J. Agardh 



Part of a plant such as may reach 30- 

 50 cm. in height, showing coarse, succu- 

 lent branches and warty surface, X 0.7. 

 This and other subcylindrical species may 

 be found in Florida and westward along 

 the Gulf coast. Other species are flattened 

 but are of infrequent occurence. 



Figure 35 



22a Branching dichotomous, at least in part, and mainly in one plane. 

 Fig. 36 Gymnogongrus gTiiiithsiae 



Fig. 36. Gymnogongrus grifiithsiae (Tur- 

 ner) Martius 



A small upper part of a plant to show 

 the dichotomous branching of the cyUn- 

 drical or somewhat compressed thallua, 

 X 2. Although several flat species of Gym 

 nogongrus occur in our flora and will be 

 accounted for farther along in the key 

 this is the only cyhndrical one on our 

 coasts. The densely bushy little plants 

 reach about 5 cm. in height and grow 

 just below low water mark along the en- 

 Figure 36 tire Atlantic Coast south of Massachusetts. 



40 



