﻿Setchell:- 
  The 
  marine 
  spermatophytes 
  577 
  

  

  I 
  

  

  its 
  persistence 
  through 
  one 
  or 
  more 
  seasons, 
  its 
  dependence 
  upon 
  

   spore 
  reproduction 
  or 
  its 
  abihty 
  to 
  persist 
  through 
  vegetative 
  

   multiplication, 
  its 
  seasons 
  of 
  flowering, 
  fruiting, 
  etc., 
  in 
  different 
  

   portions 
  of 
  its 
  range, 
  any 
  difference 
  in 
  habitat 
  in 
  different 
  portions 
  

   of 
  its 
  range, 
  and 
  any 
  other 
  matters 
  which 
  may 
  be 
  characteristic 
  

   of 
  the 
  behavior 
  of 
  the 
  species 
  and 
  which 
  may 
  possibly 
  vary 
  accord- 
  

   ing 
  to 
  locality. 
  The 
  case 
  of 
  Zostera 
  marina 
  certainly 
  indicates 
  

   how 
  much 
  it 
  is 
  desirable 
  to 
  increase 
  our 
  knowledge 
  of 
  such 
  species 
  

   before 
  we 
  may 
  feel 
  certain 
  that 
  we 
  are 
  in 
  any 
  advantageous 
  

   position 
  to 
  discuss 
  the 
  factors 
  concerned 
  in 
  their 
  very 
  extensive 
  

   distribution. 
  

  

  University 
  of 
  California 
  

  

  Bibliography 
  

  

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