File:The causes and course of organic evolution; (1918) (14770822341).jpg

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Identifier: causescourseofor00macf (find matches)
Title: The causes and course of organic evolution;
Year: 1918 (1910s)
Authors: Macfarlane, John Muirhead, 1855-1943
Subjects: Evolution
Publisher: New York, The Macmillan Company
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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and a storing area for energizing food material. The cyanophyceous organisms probably originated frommore primitive bacterial ancestors first in thermal fresh-waterareas, and at temperatures of 75-50° C. We have acceptedit that 41 existing species which still live under such conditionsare probable direct descendants of these. By acclimatizationto cooling terrestrial conditions in fresh-water, on moist sur-faces, or in shady moist places, and later in the sea, a wealthof species probably evolved during mid-archsean times thatbecame the ancestors of all green plants, while the prepon-derating wealth of species now living in fresh-water or moistland areas, as compared with the much smaller number ofmarine species, seems to be a correct index to their primitiveenvironment. From green or reddish green unicellular Cyanophycese wehave traced what are probably the simplest nucleate greenalgae hke Pleurococcus and Tetrasporay while from olive-green11 322 Causes and Course of Organic Evolution
Text Appearing After Image:
FiG.lO.—Statues in evolution of the asexual and sexual generations in RedSeaweeds. 1, Bangia alropurparea; 2, Lemanea torulosa; 3, Chantransia sp.,4, Batrachospermwn; 5, Nemalion, 6, Dudresnaija; 7, Rhodomela (afterFalkenberg); Ic Chondria (after Bornet). \m. 3m., nionospore, 6, a, tetra-spore; h, female apparatus with carpogone cell bearing trichogyne (/r);/>,spermatium; cc, earlier and later stages in formation of carpospores from fer-tilized carpogone cells. Evolution of Plants 323 or bright green unicellular members of the same division theDesmidese and higher green Conjugatse probably sprang, andthese have practically all retained a fresh-water environment.From protococcaceous ancestors we have derived the Vol-vocacese that are fresh-water and also represent the climaxof unicellular specialization. From some simple unicellulargreenish brown fresh-water genus like Amphidiniiim, derivedin turn from pleurococcaceous ancestry, the four divisionsfrom Gynmodiniacese to Diatomacese

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  • bookid:causescourseofor00macf
  • bookyear:1918
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Macfarlane__John_Muirhead__1855_1943
  • booksubject:Evolution
  • bookpublisher:New_York__The_Macmillan_Company
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:339
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
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InfoField
29 July 2014

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