Archive image from page 329 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 Mode of origin of the gem. Two of the cells of the superficial layer are seen more highly magnified. The membrane of each has grown out into a nipple; in one the vertical septum can be distinguished. 400 diam. which are at right angles to the axis of the frond. Its form is at first that of a flattened Fig. 202. 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-
Archive image from page 329 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 Mode of origin of the gem. Two of the cells of the superficial layer are seen more highly magnified. The membrane of each has grown out into a nipple; in one the vertical septum can be distinguished. 400 diam. which are at right angles to the axis of the frond. Its form is at first that of a flattened Fig. 202. 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.
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