Archiv Bild von Seite 329 des cyclopaedia von Anatomie und. Die cyclopaedia von Anatomie und Physiologie cyclopdiaofana 05 Todd Jahr: 1859 eine abgeflachte Rudiment der gem seitlich gesehen. Teilung der zweiten Zelle der Rudiment durch eine vertikale Septum, auf jeder Seite, die die COM-mencements von mehreren quer Septen sind mo-out delled im protoplasma. 400 Durchm. b, die zu einem späteren Zeitpunkt 250 Durchm. Club: danach, wie es wird größer, zwei Kerben auf jeder seiner lateralen Ränder, die ähneln exakt denen der vordere Rand der junge Wedel gebildet werden. Sobald seine devel

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Dieses Bild ist ein gemeinfreies Bild. Dies bedeutet, dass entweder das Urheberrecht dafür abgelaufen ist oder der Inhaber des Bildes auf sein Urheberrecht verzichtet hat. Alamy berechnet Ihnen eine Gebühr für den Zugriff auf die hochauflösende Kopie des Bildes.

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Archive image from page 329 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 a flattened rudiment of the gem viewed laterally. Division of the second cell of the rudiment by a vertical septum, on each side of which the com- mencements of several transverse septa are mo- delled out in the protoplasma. 400 diam. b, the same at a later stage, 250 diam. club : afterwards, as it becomes larger, two notches are formed on each of its lateral margins, which exactly resemble those of the anterior margin of the young frond. As soon as its development is completed—that is, when it has attained a length of about 1 of a line, it is pushed out of the receptacle by its rapidly growing successors. If, after its expulsion, it is sown on a damp surface, a new growth at once commences in two opposite directions, in a line which is at right angles to its axis. At the same time the cells of the inferior sur- face grow out into nipple-shaped projections, which soon become filamentous roots, and the whole is transformed in toa riband-shaped frond. The organ, the development of which is de- Fig. 203. ' Outline of gem as observed two or three days after it has been sown, 50 diam. In its inferior margin is a notch which indicates its point of attachment to the floor of the gem- pouch. The other two notches, one on each side, are the points of growth of the young plant into which the gem is transformed: they resemble those which are described (§ 58.) in the margins of the young frond of Anthoceros. It is remark- able that the line of direction of growth of the young plant is at right angles both to that of the gem itself, and to that of the parent plant. scribed above, receives, in common with others of a different nature, the name of 'gem.' The whole process differs widely from that of true gemmation or ' rejuvenescence ' of an old cell, iu order that its primordial vesicle may be transformed into an embryo. This distinction

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