PLATE XIII. 

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



FIG. i. Myrionema scrangulans Grev. ; tufts natural size. 



2. " " " section (X 400). 



3. Homeostroma undulatum J. Ag. 



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



5. " " " natural size. 

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



63. " " " portion of edge (X 30). 



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



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