Morphology of Spermatophytes. [part I. Gymnosperms]
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— Juniperus Virgirdana^ showing the ends of two pollen tubes ; in the tube to the left the body cell has not yet di- vided ; in the other the division into two male cells has just taken place ; in both cases the nuclei of the tube and stalk cells are in front: x 160. — After Stkasbtjegeb.
91 MORPHOLOGY OF SPERMATOPHYTES The recorded variations from the above account are as fol- lows : In the work upon Taxus, Juniperus, Cupressus, and Se- quoia no mention is made of the two ephemeral vegetative ...cells.
They are so evanescent, however, that they may well escape the notice of any observer who does not have a very close series and good preparations. In Taxus Belajeff ^'^ observed that the body cell divides unequally, the larger male cell functioning, and the smaller one remaining in the tube during fertilization, appar- ently incapable of functioning (Fig. 73). In this he was con- firmed by Strasburger,^^ and very recently by Jager.*" It is in- FiG. 73.— Taxus laccata: ^, male gametophyte, showing generative cell (o), tube nu- cleus («), and young tube (April 10th) ; B, later stage of same, showing stalk (s) and body (J) cells ; C, the large body cell passing into the tube, accompanied by the nuclei of the tube, having divided into two very unequal male cells ; E, the larger male cell discharged into the egg ; A-0 x 230, D smi E y.
What to read after Morphology of Spermatophytes. [part I. Gymnosperms]?
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To quickly assess the difficulty of the text, read a short excerpt:
— Juniperus Virgirdana^ showing the ends of two pollen tubes ; in the tube to the left the body cell has not yet di- vided ; in the other the division into two male cells has just taken place ; in both cases the nuclei of the tube and stalk cells are in front: x 160. — After Stkasbtjegeb.
91 MORPHOLOGY OF SPERMATOPHYTES The recorded variations from the above account are as fol- lows : In the work upon Taxus, Juniperus, Cupressus, and Se- quoia no mention is made of the two ephemeral vegetative ...cells.
They are so evanescent, however, that they may well escape the notice of any observer who does not have a very close series and good preparations. In Taxus Belajeff ^'^ observed that the body cell divides unequally, the larger male cell functioning, and the smaller one remaining in the tube during fertilization, appar- ently incapable of functioning (Fig. 73). In this he was con- firmed by Strasburger,^^ and very recently by Jager.*" It is in- FiG. 73.— Taxus laccata: ^, male gametophyte, showing generative cell (o), tube nu- cleus («), and young tube (April 10th) ; B, later stage of same, showing stalk (s) and body (J) cells ; C, the large body cell passing into the tube, accompanied by the nuclei of the tube, having divided into two very unequal male cells ; E, the larger male cell discharged into the egg ; A-0 x 230, D smi E y.
What to read after Morphology of Spermatophytes. [part I. Gymnosperms]?
You can find similar books in the "Read Also" column, or choose other free books by John Merle Coulter to read onlineMoreLess
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