Plate 15 



Fig. 1 Draparnaldia acuta (C. A. Ag.) Kuetzing: portion of 



main filament, x 75 



Figs. 2, 3. Draparnaldia platyzonata Hazen: 2, portion of main fila- 

 ment, X 150; 3, X 350 



Fig. 4. Draparnaldia plumosa (Vauch.) C. A. Agardh: portion 



of main filament, x 165 



Fig. 5. Draparnaldia glomerata (Vauch.) C. A. Agardh: portion 



of main filament, x 150 



Fig. 6. Pseudulvella americana (Snow) Wille: portion of disc- 



like thallus, X 440 



[690] 



