Plate 23 

 ?Rhizoclonium eras sip ellitum West & West fa., x 150 

 Rhizoclonium fontanum Kuetzing, x 440 



Rhizoclonium heiroglyphicum (C. A. Ag.) Kuetzing, 



xl50 

 Rhizoclonium Hookeri Kuetzing: 4, large form, x 150; 



5,x75 



Rhizoclonium Hookeri Kuetzing, drawn from an her- 

 barium specimen : 6, x 100; 7, x 75 



Rasieladia ehelonum (Collins) Hoffmann & Tilden: 

 9-11 (redrawn from Smith, courtesy McGraw-Hill 

 Co.), X 125; 12, enlarged cells in upper limits of fila- 

 ment showing papilla-like pores in sporangia (from 

 specimens collected in Michigan), x 100 



[706] 



