﻿INTRODUCTION 
  TO 
  BOTANY 
  

  

  plant 
  is 
  well 
  fitted 
  for 
  much 
  chlorophyll 
  work, 
  and 
  conse- 
  

   quently 
  abundant 
  food 
  manufacture. 
  It 
  grows 
  with 
  remark- 
  

   able 
  rapidity. 
  A 
  Cladophora 
  plant 
  sometimes 
  becomes 
  broken 
  

   into 
  two 
  or 
  more 
  pieces, 
  when 
  each 
  may 
  grow 
  into 
  a 
  new 
  plant; 
  

   or 
  at 
  times 
  the 
  cells 
  divide 
  and 
  form 
  many 
  small 
  swimming 
  

  

  spores, 
  each 
  of 
  which 
  may 
  grow 
  into 
  

   a 
  new 
  plant. 
  1 
  

  

  212. 
  Vaucheria: 
  habitat 
  and 
  struc- 
  

   ture. 
  I'ttttr/H't'ia 
  is 
  commonly 
  called 
  

   " 
  green 
  felt," 
  a 
  name 
  which 
  suggests 
  

   the 
  characteristic 
  appearance 
  which 
  it 
  

   presents 
  as 
  it 
  grows 
  upon 
  the 
  moist 
  

   surface 
  of 
  the 
  earth, 
  in 
  pots, 
  on 
  grow- 
  

   ing 
  tables 
  in 
  the 
  greenhouse, 
  or 
  upon 
  

   damp, 
  shaded 
  soil 
  out 
  of 
  doors. 
  It 
  

   also 
  grows 
  in 
  pools 
  of 
  water, 
  where 
  it 
  

   is 
  distinguished 
  from 
  many 
  other 
  algre 
  

   by 
  its 
  coarseness. 
  Certain 
  species 
  of 
  

   Cladophora 
  are 
  coarser 
  than 
  Vauclieria, 
  

   but 
  their 
  greater 
  length 
  and 
  more 
  

   extensive 
  branching 
  will 
  ordinarily 
  

   enable 
  one 
  to 
  distinguish 
  them. 
  Plants 
  

   that 
  have 
  been 
  kept 
  in 
  a 
  dish 
  of 
  water 
  

   in 
  the 
  laboratory 
  for 
  a 
  few 
  days 
  grow 
  

   into 
  a 
  heavy, 
  moss-like 
  mass 
  and 
  are 
  

   good 
  material 
  for 
  study. 
  The 
  plant 
  

   branches 
  considerably 
  (fig. 
  177), 
  and 
  

   the 
  newest 
  branches 
  are 
  the 
  greenest 
  and 
  most 
  active. 
  The 
  

   older 
  portions 
  may 
  die, 
  thus 
  separating 
  the 
  branches 
  from 
  

   one 
  another 
  so 
  that 
  new 
  individuals 
  are 
  formed 
  by 
  vegeta- 
  

   tive 
  reproduction. 
  No 
  cross 
  walls 
  appear 
  in 
  the 
  vegetative 
  

   part 
  of 
  the 
  plant, 
  and 
  all 
  the 
  cells 
  are 
  within 
  the 
  tubular 
  

   wall 
  of 
  the 
  plant. 
  2 
  

  

  1 
  For 
  details 
  of 
  reproduction 
  by 
  spore 
  formation, 
  see 
  Cladophora 
  and 
  

   Ulothrix 
  in 
  Bergen 
  and 
  Call 
  I 
  \\dl, 
  Practical 
  Botany, 
  or 
  Berpen 
  and 
  

   Principles 
  of 
  Botany. 
  2 
  Such 
  a 
  plant 
  is 
  called 
  a 
  coenocyte. 
  

  

  FIG. 
  176. 
  A 
  branching 
  alga 
  

   (Cladophora) 
  

  

  This 
  plant, 
  but 
  a 
  small 
  part 
  

   of 
  which 
  is 
  here 
  shown, 
  often 
  

   forms 
  great 
  mats 
  of 
  growth 
  

   which 
  cover 
  the 
  rocks 
  and 
  

   sticks 
  upon 
  which 
  it 
  grows. 
  

   After 
  Collins 
  

  

  