﻿210 
  Stork: 
  Studies 
  in 
  the 
  genus 
  Taraxacum 
  

  

  _ 
  M 
  

  

  3. 
  Feraald, 
  M. 
  L. 
  Taraxacum 
  palusire 
  in 
  America. 
  Rhodora 
  4: 
  

  

  155-157- 
  1902. 
  

  

  4. 
  Handel-Mazzetti, 
  H., 
  Freiherr 
  von. 
  Monographic 
  der 
  Gattung 
  

  

  Taraxacum. 
  Leipzig 
  and 
  Vienna. 
  1907. 
  

   5- 
  Juel, 
  H. 
  O. 
  Die 
  Tetradenteilung 
  bei 
  Taraxacum 
  und 
  andern 
  

  

  Cichoriaceen. 
  Kgl. 
  Sv. 
  Vet.-Akad. 
  Handl. 
  39*: 
  1-21. 
  pi. 
  i-j- 
  

   1905. 
  

  

  6. 
  Osawa,^I. 
  Studies 
  on 
  the 
  cytology 
  of 
  some 
  species 
  of 
  Taraxacum. 
  

  

  Archiv. 
  Zellforsch. 
  10: 
  450-469. 
  pi. 
  37, 
  j8. 
  1913. 
  

  

  7. 
  RaunMaer, 
  C. 
  Kimdannelse 
  uden 
  Befrugtning 
  hos 
  Molkebotte 
  

  

  (Taraxacum). 
  Bot. 
  Tidsskr. 
  [Kj0benhavn] 
  25: 
  109-140. 
  1903. 
  

  

  8. 
  Rosenberg, 
  O. 
  Ueber 
  die 
  Embryobildung 
  in 
  der 
  Gattung 
  Htera- 
  

  

  ceum. 
  Ber. 
  Deutsch. 
  Bot. 
  Ges. 
  24: 
  157-161. 
  pi. 
  11. 
  1906. 
  

   9- 
  Ueber 
  die 
  Chromosomenzahl 
  bei 
  Taraxacum 
  und 
  Rosa. 
  

  

  Svensk 
  Bot. 
  Tidskr. 
  3: 
  150-162. 
  /. 
  1-7. 
  1909. 
  

  

  10. 
  Schwere. 
  Zur 
  Entwickelung 
  der 
  Frucht 
  von 
  Taraxacum 
  officinale 
  

  

  Web. 
  Flora 
  82 
  : 
  32-66. 
  ^/. 
  2-5. 
  1896. 
  

  

  11. 
  Sears, 
  P. 
  B. 
  Amiotic 
  parthenogenesis 
  in 
  Taraxacum 
  vulgare 
  

  

  (Lam.) 
  Schrk. 
  and 
  Taraxacum 
  laevigatum 
  (Willd.) 
  DC. 
  Ohio 
  

   Jour. 
  Sci. 
  17: 
  97-100. 
  191 
  7. 
  

  

  12. 
  Winkler, 
  H. 
  Ueber 
  Parthenogenesis 
  und 
  Apogamie 
  im 
  Pflanz- 
  

  

  enreich. 
  Progr. 
  Rei 
  Bot. 
  2: 
  293-454./. 
  1-14. 
  1908. 
  

  

  E^^cplanatiou 
  of 
  plates 
  6 
  ana 
  7 
  

  

  All 
  the 
  figures 
  were 
  drawn 
  with 
  the 
  camera 
  lucida. 
  Figs. 
  19 
  and 
  20 
  are 
  magni- 
  

   fied 
  about 
  800 
  diameters; 
  the 
  remaining 
  figures, 
  about 
  1800 
  diameters. 
  

  

  Plate 
  6 
  

  

  Taraxacum 
  erythrospermum 
  Andrz. 
  

   Fig. 
  I. 
  Megaspore-mother-cell 
  with 
  nucleus 
  at 
  stage 
  of 
  synapsis. 
  

   Figs. 
  2, 
  3, 
  Chromatin 
  coming 
  out 
  of 
  synapsis 
  as 
  a 
  single 
  thread. 
  

   Fig, 
  4, 
  Thin 
  section 
  at 
  hollow 
  spireme 
  stage. 
  

   Figs. 
  5, 
  6. 
  Segmentation 
  of 
  the 
  thread 
  into 
  chromosomes. 
  

   Figs. 
  7-9, 
  Optical 
  sections 
  of 
  nuclei 
  with 
  short 
  thick 
  chromosomes. 
  

  

  Plate 
  7 
  

  

  ARAX 
  

  

  Fig. 
  10. 
  Secondary 
  elongation 
  of 
  the 
  cliromosomes. 
  

   Fig. 
  II. 
  Thin 
  section 
  at 
  same 
  stage. 
  

  

  Fig. 
  12. 
  Second 
  shortening 
  and 
  thickening 
  of 
  chromosomes 
  just 
  prior 
  to 
  spindle 
  

   formation, 
  nuclear 
  membrane 
  disappearing. 
  

  

  Figs. 
  13, 
  14, 
  15. 
  Arrangement 
  of 
  chromosomes 
  on 
  Spindle. 
  

  

  Fig. 
  16. 
  Characterissfir 
  n^milar 
  

  

  in 
  cell. 
  

  

  metapha 
  

  

  Fig. 
  17. 
  Telophase 
  with 
  disappearing 
  spindle. 
  

  

  Fig. 
  18. 
  Daughter 
  cells 
  of 
  first 
  and 
  only 
  division. 
  

  

  Figs. 
  19. 
  20. 
  Later 
  stages 
  of 
  same; 
  upper 
  cell 
  in 
  each 
  case 
  ia 
  the 
  chalazal 
  cell. 
  

  

  