204 PHYLUIM V. PHAEOPHYCEAE 



sections from the drj" specimens will frequently show the sexual 

 organs quite well. It must be remembered that some species 

 are dioecious, i.e. have the antherids on one plant and the 

 oogones on another. 



(g) Make very thin cross and longitudinal sections of differ- 

 ent portions of the plant bod}', and study the tissues. Note 

 particularly the boundary tissue (epidermis), and the cells 

 constituting the mid-ribs and harder portions of the stems and 

 leaves. 



(h) Secure in like manner specimens of Gulfwced, and make 

 macroscopic examination of the plant body, then if there is 

 time available make cross-sections of the air bladders and the 

 receptacles. 



LITERATURE OF PHAEOPHYCEAE 



George Murray, An Introduction to the Study of Seaweeds, 



London, 1895. 

 G. B. De Toni, Sylloge Algarum, vol. Ill, Padua, 1895. 

 W. G. Farlow, Marine Algae of New England and Adjacent 



Coast, Washington, 1881. 



