File:The structure and development of mosses and ferns (Archegoniatae) (1918) (14598363299).jpg

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Identifier: structuredevelop00camp3 (find matches)
Title: The structure and development of mosses and ferns (Archegoniatae)
Year: 1918 (1910s)
Authors: Campbell, Douglas Houghton, 1859-1953
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Publisher: New York, Macmillan
Contributing Library: The LuEsther T Mertz Library, the New York Botanical Garden
Digitizing Sponsor: The LuEsther T Mertz Library, the New York Botanical Garden

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each dividing once more, the four result-ing chloroplasts remain close together with the nucleus, in thecentre of the cell. Davis (i) has made a very complete study of the sporedivision in A. IcBvis. In this species the archesporium is lessmassive than in A. Pearsoni or A. fusiformis, and the ar-rangement of the sporogenous and sterile cells less regular.Davis found that the sporophytic nuclei had regularly eightchromosomes, those of the gametophyte four. Owing to the small amount of chromatin in the nucleus,the karyokinetic figures are small and the changes difficult tofollow satisfactorily. Enough can be easily made out, how*ever, to show that the process is in no way peculiar. There isfirst a nuclear spindle of the ordinary form, and the resultingnuclei assume the resting stage before dividing again. Eachthen divides, and the four nuclei move to points equi-distant from each other, and which are already occupied by thefour chloroplasts. After this is accomplished, cell walls arise
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IV. THE ANTIIOCEROTES 141

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Author Campbell, Douglas Houghton, 1859-1953
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Flickr tags
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  • bookid:structuredevelop00camp3
  • bookyear:1918
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Campbell__Douglas_Houghton__1859_1953
  • bookpublisher:New_York__Macmillan
  • bookcontributor:The_LuEsther_T_Mertz_Library__the_New_York_Botanical_Garden
  • booksponsor:The_LuEsther_T_Mertz_Library__the_New_York_Botanical_Garden
  • bookleafnumber:153
  • bookcollection:biodiversity
  • bookcollection:NY_Botanical_Garden
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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30 July 2014
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