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Morphology of Spermatophytes Volume 1 (Paperback) Loot Price: R381
Discovery Miles 3 810
Morphology of Spermatophytes Volume 1 (Paperback): John Merle Coulter

Morphology of Spermatophytes Volume 1 (Paperback)

John Merle Coulter

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Loot Price R381 Discovery Miles 3 810

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 Excerpt: ...tier then divide simultaneously, and two tiers are organized (Fig. 76, F). The process is again repeated by the lower tier, and the result is three tiers of four cells each (Fig. 76, 0). With the appearance of this last tier the development of the proembryo ceases. At this stage, therefore, there are three complete tiers, with four cells in each tier, and above these completely walled cells there are the four nuclei separated from one another by walls, but freely exposed above to the food supply of the spore. By their size and generally active appearance it would seem that they must continue functional for some time in connection with nutritive work. Fig. 77.--Firms Laricio, the first division of tho nucleus of the oospore; the entire mitotic figure is intranuclear; x 500.--After Chamberlain. It will be noted that the proembryo in Conifers differs from that in Cycads in the fact that free nuclear division is much restricted, resulting usually in a group of foiir nuclei rather than a great number; that as a result there is no development of tissue in a parietal position; that the tissue developed at the base of the oospore is more definite and limited as to number of cells and their functions. At the same time, the evidence seems clear that the proembryo of Conifers must have been derived from just such a condition as is shown by the proembryo of Cycads and Ginkgo. While this account probably applies in outline to Conifers in general, there are differences in certain details which are suggestive. The outline which seems to apply to all Conifers is as follows: the development of free nuclei from the fusion nucleus, the placing of these nuclei in a plane at the bottom of the oospore, the appearance of incomplete walls separating the nuclei from one another but...


Imprint: Rarebooksclub.com
Country of origin: United States
Release date: March 2012
First published: March 2012
Authors: John Merle Coulter
Dimensions: 246 x 189 x 3mm (L x W x T)
Format: Paperback - Trade
Pages: 58
ISBN-13: 978-1-130-13593-0
Categories: Books > Sport & Leisure > Natural history, country life & pets
Books > Sport & Leisure > Natural history, country life & pets > General
LSN: 1-130-13593-4
Barcode: 9781130135930

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