Am.  Jour.  Pharm. 
July,  1897. 
California  Manna. 
333 
Sereno  Watson],  the  "  manna  "  observed  to  form  on  these  plants  is 
the  secretion  of  an  insect  and  not  an  exudation  from  the  plant. 
Phragmites  communis,  thus  far,  comes  nearest  the  plant  described  by 
Father  Picolo. 
All  the  plants  cited  before  were  found  to  occur  in  locations  alto- 
gether different  from  the  locality  where  Father  Picolo  made  his 
observations,  which  does  not,  however,  preclude  them  from  his 
territory. 
(See  accompanying  map.) 
