204 PHYLUM V. PHAEOPHYCEAE 
sections from the dry 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 body, 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 Gulfweed, 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 
Greorce Murray, An Introduction to the Study of Seaweeds, 
London, 1895. 
G. B. De Tont, Sylloge Algarum, vol. III, Padua, 1895. 
W. G. Fartow, Marine Algae of New England and Adjacent 
Coast, Washington, 1881. 
