PLATE XIII. 

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



Fig. I. Myrionema serangulatts Grew . ; tufts natural size. 



2. " " " section CX 400). 



3. Homeostroma undulatum J. Ag. 



4. Dermocarpa fucicola &^. now.; section (X 400). 

 5' *' " " natural size. 

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



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



6c. '♦ " " section (X 400). 



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