﻿8 
  Howe: 
  Monosporangial 
  discs 
  in 
  Liagora 
  

  

  13. 
  A 
  later 
  stage 
  In 
  the 
  development 
  of 
  a 
  disc, 
  but 
  showing 
  a 
  shorter 
  root-hair 
  

   (No. 
  477Sd), 
  X 
  620. 
  

  

  14. 
  An 
  older 
  stage, 
  with 
  long 
  root-hair 
  and 
  with 
  suggestion 
  of 
  a 
  short 
  stalk 
  at 
  

   one 
  edge, 
  indicating 
  origin 
  of 
  the 
  disc 
  from 
  a 
  two-celled 
  gemma 
  as 
  show^n 
  in 
  Figures 
  7 
  

   and 
  8 
  (No. 
  477Sd), 
  X 
  272. 
  

  

  15. 
  Dorsal 
  view 
  of 
  a 
  young 
  disc, 
  suggesting 
  discs 
  of 
  species 
  of 
  Erythrotrichia 
  and 
  

   Erythrocladia 
  but 
  apparently 
  belonging 
  in 
  the 
  present 
  series 
  (L. 
  valida. 
  No. 
  4778c), 
  

  

  X 
  510. 
  

  

  16. 
  A 
  later 
  saucer-shaped 
  stage, 
  seen 
  more 
  or 
  less 
  edgewise, 
  and 
  showing 
  three 
  

   hairs 
  springing 
  from 
  the 
  dorsal 
  surface 
  in 
  its 
  thicker 
  central 
  part 
  and 
  one 
  root-hair 
  

   from 
  its 
  ventral 
  surface 
  C-^, 
  valida. 
  No. 
  477Sc). 
  X 
  272. 
  

  

  17. 
  Dorsal 
  view 
  of 
  a 
  nearly 
  mature 
  disc 
  with 
  two 
  monosporangia. 
  The 
  dorsal 
  

   hairs 
  have 
  deliquesced 
  or 
  are 
  so 
  very 
  inconspicuous 
  that 
  no 
  attempt 
  has 
  been 
  made 
  

   to 
  represent 
  them- 
  The 
  dotted 
  outer 
  line 
  indicates 
  boundaries 
  of 
  the 
  peripheral 
  

   mucus 
  or 
  gelatinized 
  outer 
  walls. 
  {L. 
  valida. 
  No. 
  4778c). 
  X 
  350. 
  

  

  18. 
  An 
  obliquely 
  dorsal 
  view 
  of 
  a 
  mature 
  disc 
  with 
  several 
  monosporangia 
  (L. 
  

  

  ceranoides, 
  No. 
  4778d 
  — 
  edges 
  of 
  disc 
  less 
  monostromatic 
  than 
  in 
  L. 
  valida). 
  X 
  272, 
  

  

  19- 
  Escape 
  of 
  aplanospore 
  from 
  terminal 
  cell 
  of 
  assimilatory 
  filament 
  of 
  L.farinosa 
  

   (No. 
  4773)- 
  X 
  375- 
  

  

  20. 
  A 
  free 
  aplanospore 
  from 
  the 
  same 
  plant 
  (No. 
  4773). 
  X 
  375. 
  

  

  21. 
  A 
  young 
  disc 
  of 
  L. 
  farinosa 
  (No. 
  4773) 
  in 
  ventral 
  view, 
  showing 
  first 
  root- 
  

   hair. 
  X 
  620. 
  

  

  22. 
  Another 
  young 
  disc 
  in 
  obliquely 
  ventral 
  view 
  (No. 
  4775), 
  showing 
  base 
  of 
  

   first 
  hair 
  from 
  dorsal 
  surface 
  and 
  first 
  root-hair. 
  X 
  620. 
  

  

  23. 
  A 
  mature 
  or 
  nearly 
  mature 
  disc 
  of 
  L, 
  farinosa 
  (No. 
  4775). 
  in 
  lateral 
  view, 
  

   showing 
  the 
  more 
  or 
  less 
  protuberant 
  monosporangia. 
  The 
  dotted 
  line 
  indicates 
  the 
  

   boundary 
  of 
  the 
  mucus 
  envelope, 
  which, 
  in 
  the 
  natural 
  state, 
  is 
  lightly 
  permeated 
  

   with 
  lime. 
  Only 
  about 
  one 
  third 
  of 
  the 
  length 
  of 
  the 
  dorsal 
  hairs 
  is 
  shown. 
  X 
  272. 
  

  

  24. 
  Obliquely 
  dorsal 
  view 
  of 
  a 
  mature 
  or 
  nearly 
  mature 
  disc 
  of 
  L. 
  pinnata 
  

   (No. 
  4776), 
  with 
  monosporangia, 
  etc. 
  X 
  272. 
  

  

  