﻿Howe: 
  Monosporangial 
  discs 
  in 
  Liagora 
  7 
  

  

  alleged 
  to 
  occur 
  in 
  Liagora, 
  However, 
  he 
  believes 
  the 
  above 
  

   explanation 
  of 
  the 
  origin 
  of 
  the 
  discs 
  to 
  be 
  correct 
  and 
  ventures 
  to 
  

  

  w 
  

  

  publish 
  his 
  observations 
  in 
  the 
  hope 
  that 
  some 
  one 
  more 
  favorably 
  

   situated, 
  perhaps 
  with 
  access 
  to 
  living 
  material, 
  with 
  facilities 
  for 
  

   cultural 
  experiments, 
  and 
  with 
  a 
  taste 
  for 
  cytological 
  investiga- 
  

  

  may 
  

  

  be 
  able 
  to 
  confirm 
  or 
  disprove 
  them. 
  The 
  possibility 
  

   that 
  the 
  discs 
  represent 
  an 
  obligate 
  epi-endophyte 
  with 
  a 
  boring 
  

   parasitic 
  spore 
  deserves 
  special 
  consideration. 
  

  

  The 
  New 
  York 
  Botanical 
  Garden 
  

  

  Kxplanation 
  of 
  plate 
  1 
  

  

  The 
  material 
  from 
  which 
  the 
  drawings 
  on 
  this 
  plate 
  were 
  made 
  was 
  obtained 
  

   from 
  four 
  species 
  of 
  Liagora, 
  all 
  collected 
  by 
  the 
  writer 
  at 
  Montego 
  Bay, 
  Jamaica. 
  

  

  1. 
  Terminal 
  cells 
  of 
  an 
  assimilatory 
  filament 
  of 
  Liagora 
  cerano 
  ides 
  (No. 
  47y8d), 
  

   showing 
  enlargement 
  and 
  rounding 
  of 
  two 
  cells 
  preparatory 
  to 
  their 
  division 
  to 
  form 
  

   discs. 
  X 
  620. 
  (The 
  relations 
  of 
  the 
  branches 
  have 
  been 
  somewhat 
  disturbed 
  and 
  

   distorted 
  by 
  manipulation) 
  ' 
  

  

  2. 
  Enlarged 
  terminal 
  cell 
  of 
  an 
  assimilatory 
  filament 
  of 
  L. 
  ceranoides 
  (No. 
  5034), 
  

   showing 
  gelatinization 
  of 
  apical 
  portion 
  of 
  wall 
  of 
  original 
  cell 
  and 
  formation 
  of 
  new 
  

   wall 
  for 
  the 
  rejuvenated 
  cell. 
  X 
  620. 
  

  

  3. 
  A 
  young 
  few-celled 
  disc 
  of 
  L, 
  valida 
  (No. 
  4'jy8c)y 
  still 
  connected 
  by 
  mucus 
  with 
  

   the 
  filament 
  from 
  the 
  terminal 
  cell 
  of 
  which 
  it 
  has 
  apparently 
  originated. 
  X 
  375. 
  

  

  4. 
  A 
  young 
  disc 
  of 
  similar 
  size 
  but 
  with 
  more 
  niimerous 
  and 
  smaller 
  cells, 
  the 
  disc 
  

   p 
  obably 
  representing 
  a 
  branch 
  of 
  the 
  filament 
  against 
  which 
  it 
  lies 
  (No. 
  4778c 
  

   L, 
  valida), 
  X 
  375. 
  

  

  5. 
  A 
  young 
  disc 
  showing 
  its 
  first 
  root-hair 
  and 
  connected 
  by 
  mucus 
  with 
  the 
  

   filament 
  from 
  the 
  terminal 
  cell 
  of 
  w^hich 
  it 
  was 
  apparently 
  derived 
  (No. 
  4778c 
  

   L. 
  valida). 
  X 
  375- 
  

  

  6. 
  A 
  young 
  disc 
  inL. 
  ceranoides 
  (No. 
  5034), 
  -with, 
  a 
  mucus 
  connection 
  with 
  the 
  

   end 
  of 
  the 
  filament 
  from 
  the 
  terminal 
  cell 
  of 
  which 
  it 
  was 
  apparently 
  derived. 
  X 
  375- 
  

  

  7. 
  A 
  two-celled 
  gemma 
  in 
  L, 
  ceranoides 
  (No. 
  477^d) 
  about 
  to 
  be 
  abjointed. 
  X 
  620 
  

  

  8. 
  A 
  later 
  stage 
  in 
  the 
  development 
  of 
  a 
  similar 
  gemma 
  after 
  detachment, 
  the 
  

   distal 
  cell 
  now 
  divided 
  into 
  three 
  cells 
  and 
  the 
  proximal 
  cell 
  remaining 
  undivided, 
  

   forming 
  a 
  sort 
  of 
  stalk 
  to 
  the 
  young 
  disc 
  (L. 
  ceranoides. 
  No. 
  47TSd). 
  X 
  620. 
  

  

  9. 
  The 
  terminal 
  portion 
  of 
  an 
  assimilatory 
  filament 
  of 
  L. 
  ceranoides 
  (No, 
  4778d), 
  

   showing 
  the 
  formation 
  of 
  several 
  unicellular 
  gemmae 
  or 
  aplanespores 
  in 
  a 
  more 
  or 
  

  

  less 
  concatenate 
  series. 
  X 
  510. 
  

  

  10. 
  A 
  supposed 
  free 
  aplanospore 
  or 
  unicellular 
  gemma 
  before 
  its 
  first 
  division 
  

   (L. 
  ceranoides. 
  No. 
  4778d). 
  Possibly, 
  how^ever, 
  a 
  spore 
  from 
  a 
  monosporangiura 
  of 
  a 
  

  

  matured 
  disc. 
  X 
  510. 
  _ 
  

  

  11. 
  A 
  young 
  five-celled 
  disc 
  in 
  which 
  all 
  of 
  the 
  divisions 
  appear 
  to 
  have 
  been 
  

   lengthwise 
  of 
  the 
  mother-cell, 
  with 
  the 
  first 
  root-hair 
  originating 
  from 
  near 
  one 
  of 
  the 
  

  

  poles 
  (No. 
  4778d). 
  X 
  510. 
  

  

  12. 
  A 
  young 
  four-celled 
  disc 
  in 
  which 
  the 
  first 
  division 
  appears 
  to 
  have 
  been 
  

  

  lengthwise 
  of 
  the 
  mother 
  cell, 
  followed 
  by 
  the 
  transverse 
  division 
  of 
  one 
  of 
  the 
  

   daughter-cells 
  (No. 
  477Sd). 
  X 
  SIO. 
  

  

  