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Autor: John Merle Coulter
ISBN-13: 9780282089597
Einband: Taschenbuch
Seiten: 612
Gewicht: 807 g
Format: 229x152x31 mm
Sprache: Englisch
Erscheinungsdatum: 01.05.2018

The Botanical Gazette, Vol. 59: January-June, 1915 (Classic Reprint)

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Excerpt from The Botanical Gazette, Vol. 59: January-June, 1915In the paper on the male gametophyte the pollen was described as lodging on the ovuliferous scale and then growing over the sur face to the micropyle, and a figure was given showing a number of pollen tubes. These pollen tubes were shown pursuing a more or less direct course to the micropyle. It was stated that they sometimes crossed from the upper surface of the scale on which they had germinated to the under surface of the scale above. Since that was written Ems has described the behavior of the pollen tubes of Agathis The very interesting behavior of these tubes led me to te-examine those of Araucaria. It was found that while they do not, apparently, penetrate the tissues of scale and cone axis in the remarkable fashion characteristic of the sister genus, they do, nevertheless, branch much more profusely than had been supposed. It is often possible to separate a branching tube from the adjacent scales without breaking many of these branches. From this it appears that they are comparatively superficial. There is usually one main branch of the tube that goes more or less directly to the nucellus. From this numerous.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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Autor: John Merle Coulter
ISBN-13:: 9780282089597
ISBN: 0282089594
Erscheinungsjahr: 01.05.2018
Verlag: FB&C LTD
Gewicht: 807g
Seiten: 612
Sprache: Englisch
Sonstiges: Taschenbuch, 229x152x31 mm