Contributions to the Knowledge of the Life History of Pinus with Special Reference to Sporogenesis, the Development of the Gametophytes and Fertilization
Contributions to the Knowledge of the Life History of Pinus with Special Reference to Sporogenesis, the Development of the Gametophytes and Fertilization
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. 1904 Excerpt: ...the center and their ends have become closed by walls. The development subsequent to the formation of the open cells varies considerably in Pinus from that described by these writers for other Gymnosperms. No cell has ever been observed to extend from the circumference to the center of the prothallial cavity. The cells ...
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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. 1904 Excerpt: ...the center and their ends have become closed by walls. The development subsequent to the formation of the open cells varies considerably in Pinus from that described by these writers for other Gymnosperms. No cell has ever been observed to extend from the circumference to the center of the prothallial cavity. The cells are long, it is true, the walls delicate and wavy in outline, but a ring of tissue composed of longer or shorter cells is formed rather early in the inward growth of the prothallium. The cells of the innermost row always remain open on their outer free sides, their cytoplasm is more abundant than in the other cells of the prothallium and their nuclei invariably retain a position near the open side of the cells (fig. 162). As observed by Jaccard ('94), and Jager ('99), the nuclei of the prothallium cease to divide synchronously after individual cells have been organized. When the center is reached the cells close and thus, one year after pollination, the endosperm becomes a solid mass of tissue. The prothallium grows rapidly after it has become a continuous cellular body and in a few days it fills all the central and lower portion of the ovule. Above it is the prominent nucellar cap, while only a few cells of the nucellus remain along the sides separating the gametophyte from the integument (fig. 73, plate VII). Cell-divisions continue to take place, and the cytoplasm becomes more abundant, though the prothallial cells are never richly supplied with cytoplasm. Strasburger ('80), Jager ('99), and several more recent students have noted many nuclei in the endosperm cells. I have not observed multinucleated cells in the prothallium of Pinus up to the time when the suspensor has elongated and carried a several celled embryo to a considerable depth...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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