Archive image from page 310 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 REPRODUCTION, VEGETABLE (VEGETABLE OVUM). 235 a quantity of granular mucus. Soon this last arranges itself in two masses, at opposite Fig. 160. Original parent-cell oj spores of the same, 500 dlam. sides of the central nucleus. Each of these masses is transformed into a new nucleus, from which radiating threads of mucus stretch to the internal surface of the corresponding half of the cell. Each new nucleus is, when fully formed, vesicular, possessing a membra
Archive image from page 310 of The cyclopædia of anatomy and. The cyclopædia of anatomy and physiology cyclopdiaofana05todd Year: 1859 REPRODUCTION, VEGETABLE (VEGETABLE OVUM). 235 a quantity of granular mucus. Soon this last arranges itself in two masses, at opposite Fig. 160. Original parent-cell oj spores of the same, 500 dlam. sides of the central nucleus. Each of these masses is transformed into a new nucleus, from which radiating threads of mucus stretch to the internal surface of the corresponding half of the cell. Each new nucleus is, when fully formed, vesicular, possessing a membrane of extreme delicacy, and is surrounded by a layer of protoplasma. At a later period its contour becomes cloudy and indistinct; this change being preparatory to a second division, which results in the formation of four new nuclei similar to the first two; these Fig. 161. The same, containing four vesicular nuclei, each cell the nucleus disappears, and is re- placed by two others, between which a per- pendicular septum is formed. From a repeti- tion of the same process, there results a cylindrical body consisting of a series of four cells, the fully formed elater. 64. No sooner are the spores of the upper part of the capsule ripe, than it splits into two valves; dehiscence commences at the apex, leaving, as it proceeds, the columella with the loosely attached spores and elaters. 65. Jungermannicefrondosee:—From Antho- ceros we pass to a group of plants, which, while they resemble it in their mode of growth, differ from it considerably in the form of their antheridia and archegonia, and still more in that of the organs in which they are contained. Here as in Anthoceros we follow the descrip- tion of Hofmeister (Pellia epiphylla). 66. First period.—Germination of the spores. —The spore is an ovoid cell, divided into four by three transverse septa, and enclosed in a finely granular external membrane. Of the four cavities, one of the terminal ones dis- tinguishes itself
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