﻿286 
  Haynes: 
  Six 
  species 
  of 
  Riccia 
  

  

  Fig. 
  9. 
  Scale. 
  X 
  33. 
  

  

  Figs. 
  10 
  and 
  ii. 
  Spore, 
  outer 
  and 
  inner 
  faces, 
  showing 
  irregular 
  and 
  anasto- 
  

   mosing 
  ridges. 
  X 
  265. 
  

  

  Fig. 
  12. 
  Spore, 
  showing 
  o'uter 
  face 
  with 
  light 
  reticulations 
  or 
  shallow 
  pits 
  in 
  

   middle 
  portion, 
  X 
  265. 
  \ 
  

  

  Fig. 
  13. 
  Spore, 
  showing 
  outer 
  face 
  with 
  markings 
  similar 
  to 
  those 
  of 
  10. 
  X 
  265. 
  

  

  Fig. 
  14. 
  Spore, 
  showing 
  inner 
  triangular 
  faces. 
  X265. 
  

  

  Fig. 
  I 
  was 
  drawn 
  from 
  a 
  specimen 
  in 
  the 
  herbarium 
  of 
  the 
  New 
  York 
  Botanical 
  

   Garden, 
  from 
  Jacksonville, 
  Florida, 
  Underwood 
  & 
  Cook, 
  Hep. 
  42; 
  Figs. 
  2 
  and 
  3' 
  

   from 
  a 
  specimen 
  collected 
  by 
  Severin 
  Rapp, 
  at 
  Sanford, 
  Florida, 
  February 
  7. 
  1913; 
  

   Figs. 
  6, 
  8. 
  and 
  9, 
  from 
  a 
  specimen 
  collected 
  by 
  Severin 
  Rapp. 
  at 
  Sanford. 
  Florida, 
  

   May 
  9, 
  1912; 
  Figs. 
  4. 
  5. 
  7, 
  10, 
  and 
  11, 
  from 
  a 
  specimen 
  collected 
  by 
  Severin 
  Rapp, 
  a*- 
  

   Sanford, 
  Florida, 
  January. 
  1904, 
  and 
  communicated 
  by 
  Herr 
  F. 
  Stephani; 
  Figs. 
  

   12, 
  13, 
  and 
  14. 
  from 
  a 
  specimen 
  in 
  the 
  herbarium 
  of 
  the 
  New 
  York 
  Botanical 
  Garden, 
  

   collected 
  at 
  Jacksonville, 
  Florida. 
  

  

  I 
  

  

  Plate 
  ii 
  

   Figs. 
  1-5. 
  Riccia 
  dictyospora 
  M. 
  A. 
  Howe 
  

  

  Fig. 
  I. 
  Plant 
  colony, 
  drawn 
  from 
  fresh 
  material. 
  X 
  4. 
  

  

  Fig. 
  2. 
  Plant 
  twisted 
  in 
  growth, 
  showing 
  latero-ventral 
  scales. 
  X 
  33. 
  

  

  Fig. 
  3. 
  Outline 
  of 
  cross-section 
  of 
  thallus. 
  X 
  19. 
  

  

  Fig. 
  4. 
  Spore, 
  outer 
  face. 
  X 
  390. 
  

  

  Fig. 
  s. 
  Optical 
  section 
  of 
  spore, 
  showing 
  difference 
  in 
  height 
  of 
  papillae, 
  the 
  

   the 
  upper 
  side 
  of 
  figure 
  representing 
  the 
  outer 
  face. 
  X 
  390, 
  

  

  Figs, 
  i 
  and 
  3'were 
  drawn 
  from 
  plants 
  collected 
  by 
  C. 
  C. 
  Haynes, 
  on 
  West 
  Rock, 
  

   New 
  Haven, 
  Connecticut, 
  October 
  12, 
  1911; 
  Figs. 
  2, 
  4, 
  and 
  5. 
  from 
  type 
  material. 
  

   R. 
  M, 
  Harper 
  68a, 
  Athens. 
  Georgia, 
  June 
  26, 
  1900. 
  

  

  Figs. 
  6-1 
  r. 
  Riccia 
  Beyrichiana 
  Hampe 
  

   Fig. 
  6. 
  Plant 
  colony, 
  drawn 
  from 
  fresh 
  material. 
  X 
  4, 
  

   Fig. 
  7. 
  Outline 
  of 
  cross-section 
  of 
  thallus, 
  showing 
  cilia. 
  X 
  19. 
  

   Fig. 
  8. 
  Cells 
  and 
  cilia 
  seen 
  in 
  cross-section 
  of 
  thallus. 
  X 
  19. 
  

   Figs. 
  9 
  and 
  10. 
  Spore, 
  outer 
  and 
  inner 
  faces. 
  X390. 
  

   Fig. 
  IX, 
  Spore 
  in 
  profile 
  showing 
  bold 
  markings 
  on 
  outer 
  face, 
  X 
  390, 
  

   Figs, 
  6, 
  7, 
  and 
  8 
  were 
  drawn 
  from 
  a 
  specimen 
  collected 
  by 
  C. 
  C. 
  Haynes. 
  on 
  

  

  West 
  Rock. 
  New 
  Haven, 
  Connecticut. 
  October 
  21. 
  1911; 
  Figs. 
  9. 
  10. 
  and 
  11'. 
  from 
  a 
  

  

  specimen 
  collected 
  by 
  Annie 
  Lorenz. 
  at 
  Hartford, 
  Connecticut. 
  

  

  Plate 
  12 
  

   / 
  Figs. 
  1-6. 
  Riccia 
  arvexsis 
  Aust. 
  

  

  Fig. 
  I. 
  Plant 
  colonies, 
  drawn 
  from 
  fresh 
  material. 
  X 
  4. 
  

  

  Fig. 
  2. 
  Outline 
  of 
  cross-section 
  of 
  thallus. 
  X 
  20. 
  

  

  Fig. 
  3. 
  Portion 
  of 
  epidermal 
  layer 
  in 
  cross-section. 
  X 
  155. 
  

  

  Fig. 
  4. 
  Portion 
  of 
  epidermis, 
  showing 
  rarely 
  occurring 
  cilia. 
  X 
  87. 
  

  

  Fig. 
  s. 
  Spore, 
  outer 
  face, 
  showing 
  areolate-alveolate 
  markings 
  and 
  crenate 
  or 
  

   crenulate 
  wing. 
  X 
  390. 
  

  

  Fig. 
  6. 
  Portion 
  of 
  wing 
  with 
  crenulate 
  margin 
  seen 
  in 
  optical 
  section. 
  X 
  390. 
  

  

  Fig. 
  I 
  was 
  drawn 
  from 
  a 
  specimen 
  collected 
  by 
  C. 
  C. 
  Haynes. 
  at 
  Hartford. 
  

  

  Connecticut, 
  October 
  20. 
  1911; 
  Fig. 
  2. 
  from 
  a 
  specimen 
  collected 
  by 
  Fred 
  Donaghy, 
  

  

  