﻿1^9°-] 
  BOTANICAL 
  GAZETTE. 
  ojy 
  

  

  ,uV\^ 
  follovying 
  observations 
  upon 
  Tudulwa 
  cylindrica 
  

   (J^u 
  J.) 
  and 
  alJied 
  species 
  are 
  given 
  as 
  a 
  contribution 
  to 
  their 
  

   life 
  histories, 
  with 
  special 
  reference 
  to 
  the 
  points 
  above 
  noted 
  • 
  

  

  •• 
  i^c 
  ^"^ 
  cylindrica, 
  as 
  found 
  in 
  the 
  eastern 
  part 
  of 
  the 
  

   United 
  States, 
  varies 
  greatly 
  in 
  external 
  appearance. 
  By 
  a 
  

   careful 
  examination 
  all 
  mature 
  specimens, 
  including 
  unusual 
  

   torms 
  or 
  variations, 
  found 
  in 
  this 
  area, 
  may 
  be 
  separated 
  into 
  

   two 
  groups 
  by 
  their 
  external 
  differences 
  only. 
  These 
  dif- 
  

   ferences, 
  however, 
  relate 
  only 
  to 
  such 
  characters 
  as 
  density 
  

   and 
  color, 
  which, 
  in 
  the 
  mature 
  sporangia, 
  have 
  no 
  essential 
  

   value 
  as 
  points 
  of 
  specific 
  difference, 
  the 
  sporangia 
  of 
  the 
  two 
  

   groups 
  being 
  morphologically 
  the 
  same. 
  

  

  During 
  the 
  summer 
  of 
  1889, 
  while 
  in 
  the 
  Adirondack 
  

   mountains, 
  N. 
  Y., 
  I 
  had 
  the 
  opportunity 
  of 
  observing 
  the 
  de- 
  

   velopment 
  of 
  typical 
  examples 
  of 
  each 
  of 
  these 
  forms 
  from 
  

   the 
  Plasmodium 
  through 
  all 
  the 
  intermediate 
  stages 
  of 
  growth 
  

  

  f^-^^S^^*^-^' 
  ^^^^^ 
  similar 
  local 
  conditions. 
  I 
  had 
  previously 
  

   Jioted 
  developmental 
  differences, 
  but 
  on 
  the 
  present 
  occasion 
  

  

  he 
  forms 
  under 
  comparison 
  grew 
  simultaneously 
  on 
  adjoin- 
  

   ing 
  logs, 
  thus 
  having 
  the 
  same 
  relative 
  conditions 
  of 
  temper- 
  

   ature, 
  atmospheric 
  humidity 
  and 
  moisture 
  of 
  subjacent 
  log 
  

   sunace 
  to 
  influence 
  their 
  growth. 
  Both 
  forms 
  originated 
  from 
  

   a 
  white 
  or 
  uncolored 
  plasmodium, 
  bui 
  from 
  this 
  point 
  the 
  cor- 
  

   responding 
  stages 
  of 
  differentiation 
  and 
  erection 
  of 
  the 
  re- 
  

   spective 
  sporangia 
  to 
  complete 
  development 
  and 
  maturity 
  

   were 
  notably 
  different 
  in 
  color 
  and 
  character. 
  

   nf 
  ft. 
  contrasting 
  external 
  character 
  of 
  mature 
  specimens 
  

  

  ^ 
  these 
  types 
  may 
  be 
  described 
  as 
  follows 
  : 
  

   rorm 
  no. 
  i 
  is 
  composed 
  of 
  an 
  aggregation 
  of 
  cylindrical 
  

  

  vid^^l^^^^^' 
  ^^^^^^^' 
  standing 
  on 
  a 
  common 
  hypothallus, 
  indi- 
  

   ^^ 
  ual 
  sporangia 
  either 
  free 
  or 
  united 
  wholly 
  or 
  in 
  part 
  by 
  

   urr'^vT^ 
  ' 
  ^P^^^^ 
  rounded 
  or 
  conical, 
  very 
  fragile 
  in 
  struct- 
  

   brn' 
  . 
  ^^^"g 
  at 
  the 
  slightest 
  touch, 
  light 
  brown 
  or 
  chestnut 
  

   ';. 
  j^ 
  1" 
  color. 
  This 
  is 
  the 
  tvpe 
  of 
  the 
  common 
  TuhuUna 
  

  

  Iln-'! 
  J 
  c? 
  ^^"^^0 
  and 
  is 
  found"' 
  probably 
  in 
  all 
  parts 
  of 
  the 
  

   United 
  States. 
  v 
  :i 
  v 
  

  

  of 
  c 
  r 
  "^ 
  ^°* 
  ^ 
  ^^ 
  ^" 
  asthalium 
  composed 
  of 
  an 
  aggregation 
  

   Pres"^ 
  '"^'cal^ 
  sporangia 
  becoming 
  many-sided 
  by 
  mutual 
  

   (or'^^r^^i!' 
  ^^^^^^^> 
  standing 
  on 
  a 
  common 
  hypothallus, 
  always 
  

   spor 
  • 
  * 
  '^^^ 
  exceptions) 
  united 
  the 
  entire 
  length 
  of 
  the 
  

   near?"^V^' 
  *^^ 
  apices 
  flattened, 
  making 
  in 
  continuation 
  a 
  

   struck 
  P 
  ^^"^and 
  vernicose 
  surface 
  of 
  considerable 
  density 
  of 
  

   ure 
  5*^^ 
  ^ark 
  brown 
  or 
  umber 
  in 
  color. 
  The 
  entire 
  struct- 
  

   dark 
  \^ 
  sporangia 
  of 
  this 
  form 
  is 
  markedly 
  denser 
  and 
  

   ^^ 
  than 
  in 
  the 
  other. 
  I 
  have 
  as 
  yet 
  found 
  it 
  only 
  in 
  the 
  

  

  