File:The structure and development of mosses and ferns (Archegoniatae) (1918) (14804976523).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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VII PTERIDOPHYTA—FILICINEJE—OPHIOGLOSSACEJE 249 mined positively. Probably, as in Botrychium, the outer cell isnext divided by a vertical wall, ))erpendicular to the broadfaces of the segment, into two cells, in which divisions thentake place in both transverse and longitudinal direction withoutstrict regularity. The stem in O. pendulum is mostly made up of thin-wallcdparenchyma, and the vascular bundles are much less developedthan is the case in the underground stem of O. vulgatiim orBotrychium. The bundles are of the collateral form, /. c, theinner side is occupied by the xylem, the outer by the phloem,
Text Appearing After Image:
Fig. 134.^-Ophioglossum pendulum. A, Longitudinal section of stem apex, X6o; B,the central part of the same section, Xi8o; D, longitudinal section of very youngsporangiophore, Xi8o; E, cross-section of young sporangiophore, X6o. and there is no evident bundle-sheath developed. The bundlesform a very irregular wide-meshed cylinder, not differing essen-tially from that in O. vulgattui Van Tieghem (7) states that in Ophioglossum vuJgatumeach vascular strand is completely invested with a distinctendodermis and pericycle; but Bower (16) found the endoder-mis very poorly developed in the species studied by him,especially 0. Bergianum, a small and simple species. The stemof this form shows in transverse section two strands which may 250 ■ MOSSES AND FERNS chap. either be separate, or partly coherent, so as to form a singlecrescent-shaped bundle, when seen in section. There may be,however, even in this species, more than two strands present.Poirault (2) found a definite endodermis in the lo

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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:262
  • bookcollection:biodiversity
  • bookcollection:NY_Botanical_Garden
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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30 July 2014
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