﻿6 
  

  

  BOTANICAL 
  GAZETTE, 
  

  

  [January, 
  

  

  The 
  second 
  difficulty 
  mentioned 
  is 
  the 
  fact 
  that 
  just 
  those 
  

   forms, 
  viz., 
  Ophioglossum 
  and 
  Equisetum, 
  which 
  are 
  the 
  

   most 
  essentially 
  eusporangiate 
  of 
  all 
  pteridopliytes, 
  are 
  char- 
  

   acterized 
  by 
  the 
  root 
  and 
  stem 
  growing 
  by 
  a 
  regular 
  apical 
  

  

  cell, 
  a 
  point 
  that 
  Bower 
  regards 
  as 
  evidence 
  of 
  primitive 
  

  

  structure. 
  

  

  The 
  accompanying 
  diagram 
  will 
  show 
  the 
  relationship 
  

   assumed 
  here 
  : 
  

  

  Ophioglossese 
  

  

  throLh 
  tL 
  mT 
  n- 
  "' 
  '^^'^ 
  ^'^ 
  ^^^'« 
  "^^^^ 
  branches, 
  one 
  

   de^^tL 
  oth^r 
  Jl: 
  P-r""' 
  P°'.'^>^>' 
  terminating 
  in 
  the 
  Cyca- 
  

   inTin 
  thetnU^ 
  ^'^'^""'^ 
  ^'^^"^ 
  "^^ 
  to 
  two 
  branches 
  end- 
  

   Saiini^erTl 
  w 
  P°'^^' 
  F?""^'^ 
  '^^ 
  Marsiliace^ 
  and 
  the 
  

   must 
  be 
  SeJ 
  '^'"'"^P^^^'""^^^^' 
  according 
  to 
  this 
  view, 
  

  

  t";^:t^%To;h;t: 
  t^s!^^ 
  ^^-p^^ 
  p-- 
  

  

  habit 
  of 
  the 
  plants. 
  ^esultrng 
  fiom 
  the 
  semi-aquatic 
  

  

  J^r^ll\^^:Lr^,:\^^^^^^ 
  branched 
  off, 
  

  

  sible 
  to 
  decide 
  unirtV.nu 
  ^^ 
  ^.^''^^^' 
  '^ 
  ^^'^" 
  ^^ 
  ^"^P^^" 
  

   better 
  known 
  tbnn 
  I 
  ""P^^'^^ 
  °^ 
  ^^« 
  different 
  forms 
  is 
  

  

  kno^^n 
  than 
  at 
  present. 
  The 
  same 
  difficulty 
  is 
  true 
  

  

  