This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ... 7, A, B), and each such cell organizes within itself a single large egg (oosphere). As the egg is a female gamete, the large globular cell which produces it, and which is differentiated from the other cells of the body, is the oogonium. A perforation in the oogonium wall is formed for the entrance of ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1905 edition. Excerpt: ... 7, A, B), and each such cell organizes within itself a single large egg (oosphere). As the egg is a female gamete, the large globular cell which produces it, and which is differentiated from the other cells of the body, is the oogonium. A perforation in the oogonium wall is formed for the entrance of sperms. Other cells in the same filament, or in some other filament, are observed to differ from the ordinary cells in being much shorter, as though an ordinary cell had been divided several times without subsequent elongation (Fig. 7, A, f, B, a). In each of these short cells one or two sperms are organized, and therefore each short cell is an antheridium. When the sperms are set free they are seen to resemble very small zoospores, having the same little crown of cilia at one end. The sperms swim actively about in the vicinity of the oogonia, and sooner or later one enters the oogonium through the perforation provided in the wall, and fuses with the egg (Fig. 7, B, c). As a result of this act of fertilization an oospore is formed, which organizes a firm wall about itself. This firm wall indicates that the oospore is not to germinate immediately, but is to pass into a resting condition. Spores which form heavy walls and pass into the resting condition are often spoken of as "resting spores," and it is very common for the zygotes and oospores to be resting spores. These resting spores enable the plant to endure through unfavorable conditions, such as failure of food supply, cold, d r o u g ht, etc. When favorable conditions return, the protected resting spore is ready for germination. When the oospore of ffidogonium germinates it does not develop directly into a new filament, but the contents become organized into four zoospores...
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Add this copy of Plants a Text-Book of Botany to cart. $13.09, very good condition, Sold by Redux Books rated 5.0 out of 5 stars, ships from Wyoming, MI, UNITED STATES, published 1907 by D. Appleton.
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Very Good. Size: 0x0x0; Hardcover. ORIGINAL 1909 PRINTING. NO DUST JACKET. Pages are clean and unmarked. Book is slightly shelf-cocked. Green cloth covers with embossed lettering show light edge wear with rubbing to corners. Binding is tight, hinges strong.; 100% Satisfaction Guaranteed! Ships same or next business day!
Add this copy of Plants: a Text-Book of Botany to cart. $50.78, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Arkose Press.
Add this copy of Plants: A Text-Book of Botany to cart. $63.96, new condition, Sold by Booksplease rated 4.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2015 by Arkose Press.
Add this copy of Plants: a Text-Book of Botany to cart. $71.19, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2015 by Arkose Press.