﻿356 
  

  

  Rickett: 
  Sphaerocarpos 
  Doxnellii 
  

  

  and 
  assumed 
  a 
  very 
  elongated 
  form, 
  with 
  few 
  lobes. 
  Such 
  a 
  plant 
  

   is 
  shown 
  in 
  Fig. 
  23. 
  Similar 
  results 
  were 
  obtained 
  from 
  female 
  

   plants 
  by 
  allowing 
  regeneration 
  to 
  occur 
  under 
  water 
  (Figs. 
  24, 
  

   25). 
  In 
  one 
  case 
  (Fig, 
  24), 
  no 
  sex 
  organs 
  were 
  produced, 
  and 
  

   scarcely 
  any 
  lobes. 
  In 
  another 
  case 
  (Fig. 
  25), 
  the 
  tip 
  of 
  the 
  

   plant 
  reached 
  the 
  surface 
  of 
  the 
  water 
  and 
  there 
  began 
  to 
  take 
  on 
  

  

  Fig. 
  22. 
  The 
  apical 
  notch 
  formed 
  laterally 
  on 
  a 
  long 
  cylindrical 
  cell 
  mass. 
  

   Fig. 
  23. 
  Young 
  plant, 
  with 
  antheridia. 
  produced 
  by 
  regeneration 
  from 
  the 
  lobe 
  of 
  a 
  

   male 
  plant. 
  Fics. 
  24. 
  25. 
  Shoots 
  developed 
  from 
  portions 
  of 
  female 
  plants 
  culti- 
  

   vated 
  under 
  water: 
  I. 
  parent 
  lobe. 
  All 
  drawn 
  from 
  living 
  material. 
  Fig. 
  22. 
  X 
  lOO; 
  

  

  Figs. 
  23-25, 
  X 
  20. 
  

  

  more 
  nearly 
  the 
  ordinary 
  appearance. 
  Production 
  of 
  rhizoids 
  

   ■ 
  was 
  especially 
  abundant 
  in 
  this 
  latter 
  

  

  Summary 
  

  

  I. 
  Regeneration 
  in 
  Sphaerocarpos 
  Donnellii 
  may 
  occur 
  from 
  

   any 
  vegetative 
  tissue 
  of 
  the 
  thallus, 
  either 
  when 
  the 
  thallus 
  as 
  a 
  

  

  