﻿3i8 
  BOTANICAL 
  GAZETTE. 
  [ 
  December, 
  

  

  mountain 
  regions 
  of 
  New 
  York 
  or 
  Pennsj^lvania. 
  The 
  spores 
  

   in 
  both 
  forms 
  are 
  practicall}' 
  the 
  same, 
  the 
  only 
  difference 
  

   being 
  due 
  to 
  the 
  thicker 
  and 
  darker 
  epispores 
  of 
  form 
  no. 
  2. 
  

   The 
  epispores 
  are 
  similarly 
  sculptured, 
  showing 
  characteris- 
  

   tic 
  irregularly 
  meshed 
  reticulations 
  under 
  a 
  high 
  power. 
  

  

  The 
  differential 
  stages 
  of 
  development 
  of 
  the 
  two 
  forms 
  

   from 
  the 
  plasmodium, 
  showing 
  the 
  color 
  changes, 
  may 
  also 
  

  

  be 
  tabulated 
  as 
  follows 
  : 
  

  

  Forrn 
  no. 
  i 
  originates 
  in 
  an 
  uncolored 
  or 
  white 
  plasmodium, 
  

  

  erects 
  into 
  bright 
  rose 
  or 
  strawberry 
  red 
  immature 
  sporangia, 
  

  

  and 
  then 
  shades 
  into 
  the 
  light-brown 
  or 
  chestnut-brown 
  color 
  

   of 
  maturity. 
  

  

  Form 
  no. 
  2 
  originates 
  in 
  an 
  uncolored 
  or 
  white 
  plasmo- 
  

   dium, 
  erects 
  into 
  dark 
  raspberry 
  or 
  mulberry 
  red 
  immature 
  

   sporangia 
  and 
  then 
  shades 
  into 
  the 
  dark 
  brown 
  or 
  umber 
  

   color 
  of 
  maturity. 
  

  

  These 
  comparative 
  differences 
  in 
  color 
  appeared 
  in 
  all 
  

   cases 
  which 
  I 
  have 
  had 
  the 
  opportunity 
  of 
  observing. 
  In 
  in- 
  

   dividuals 
  of 
  the 
  same 
  type 
  the 
  color 
  varies 
  only 
  in 
  intensity 
  

   or 
  brightness, 
  not 
  in 
  tone, 
  according 
  to 
  the 
  degree 
  of 
  moisture 
  

   present 
  in 
  the 
  atmosphere 
  or 
  in 
  the 
  substratum. 
  An 
  excess 
  

   of 
  moisture, 
  such 
  as 
  may 
  be 
  caused 
  for 
  instance 
  by 
  heavy 
  

   rams 
  falling 
  upon 
  the 
  immature 
  sporangia 
  of 
  any 
  o( 
  the 
  

   Myxomycetes, 
  will 
  render 
  them 
  dull 
  and 
  lifeless 
  in 
  color, 
  im- 
  

   parting 
  a 
  faded 
  or 
  washed-out 
  appearance. 
  

  

  A 
  correct 
  appreciation 
  of 
  color 
  distinctions 
  depends 
  so 
  

   iargely 
  upon 
  the 
  personal 
  equation 
  of 
  the 
  observer 
  that 
  1 
  

   teel 
  conscious 
  that 
  the 
  foregoing 
  changes 
  may 
  not 
  have 
  been 
  

   sufficiently 
  described, 
  but 
  ?he 
  point 
  desired 
  to 
  be 
  specajy 
  

   noted 
  IS 
  that 
  each 
  of 
  the 
  above 
  forms, 
  and 
  those 
  yet 
  to 
  be 
  

   aescribed, 
  has 
  a 
  distinct 
  series 
  of 
  color 
  changes 
  which 
  char- 
  

   actenzes 
  its 
  immature 
  period 
  of 
  growth. 
  The 
  differences 
  "> 
  

   development 
  just 
  noted 
  would 
  be 
  better 
  appreciated 
  if 
  seen 
  

   than 
  described, 
  and, 
  considered 
  in 
  connection 
  with 
  the 
  con- 
  

   spicuously 
  different 
  external 
  appearance 
  of 
  the 
  two 
  for^^ 
  

   wi 
  1 
  justify 
  the 
  belief 
  of 
  a 
  phvsiological 
  specific 
  distinctio^i 
  

   between 
  them. 
  At 
  the 
  same 
  'time 
  these 
  forms 
  are 
  morp 
  J" 
  

   logically 
  similar, 
  and 
  as 
  sufficient 
  herbarium 
  characters 
  aV"- 
  

   l^U 
  * 
  Vlf''^'^^^'^^ 
  ^^ 
  separate 
  species 
  are 
  lacking, 
  we; 
  

   adsts 
  ^^ 
  ^' 
  still 
  be 
  referred 
  to 
  the 
  same 
  species 
  by 
  system- 
  

  

  loJ^f^"^^ 
  fitting 
  that 
  the 
  developmental 
  history 
  of 
  the^J 
  

  

  !e:ord\rvTt"itf 
  '^' 
  '' 
  Tubulina'cylindrica, 
  should 
  also 
  be 
  

  

  Tubulma 
  sUfitata 
  B. 
  & 
  C. 
  This 
  species 
  originates 
  froto 
  

  

  ail 
  

  

  they 
  

  

  