PLATE XIII. 

 [Proc. Wash. Acad. Sci., Vol. Ill, PI. XLVL] 



FIG. I. Myrionema serangulans Grev. ; tufts natural size. 



2. " " " section (X4Qo)- 



3. Homeostroma undulatum J. Ag. 



4. Dermocarpa fucicola sp. nov. ; section (X4OO). 



5. " " " natural size. 

 6a. Homeostroma lobatum sp. nov. ; natural size. 



66. " " " portion of edge (X 3)- 



6c. " " " section (X 400). 



[454] 



