82 ATLAS OF BIOLOGY 



FIG. X. A. fertile leaf of Chara, viewed from the same aspect and drawn to the same 

 scale as that of Nitella, Fig. VIII. 



FIG. XI. One set of reproductive organs from the same, magnified. A. 3. 



FIG. XII. The apex of the carpogonium of Nitella. 



FIG. XIII. The same in Chara, looking down on the micropyle. 



FIGS. XIV. and XV. Two stages in the development of the reproductive organs of 

 Chara, in section. From nature after Sachs. 



(Figs. VIII., X., XI., XIV., and XV., are all drawn in the same position relative to the 

 axis.) 



FIG. XVI. One antheridial shield of Chara, with its male reproductive apparatus. 

 An immature example, crushed. D. 2. 



A few segments of a ripe antheridial filament are drawn below, and to the right one 

 antherozooid, liberated by pressure. F. 3. 



FIG. XVII. The above antheridial shield, etc., seen from within. All the filaments 

 are represented. A. 3. 



FIGS. XVIII. and XIX. Two stages in the growth of the pro-embryo ; the older one 

 shows the origin of the young plant arising from it, set free by disintegration of the 

 pro-embryo, as the lateral axes are liberated by that of the adult plant. (Compare Fig. I.) 



[For further details and a full bibliography, see Sach's " Text Book of Botany," and 

 Luerssen (136).] 



a. Anthcridium. 



a'. Mother cell of the same. 



a.e. Axis of young plant. 



./. Antheridial filaments. 



a./'. Parent cells of the same. 



a/i. Apical cell of axis. 



ap'. Apical cell of pro-embryo. 



o.x. Antheridial shield. 



ax. Main axis. 



ax'. Lateral axis. 



at. Antheridial filament, cells of. 



iiz'. Mature antherozooid. 



fr, Bracteole. 



I.e. Basal cell cf reproductive organ 



c. Cilia. 



c.y. Chlorophyll granules. 



c</. Carpogonium. 



c.l'. Ascending cortical lobe. 



c.l'. Descending cortical lobe. 



cj>. Capitulum. 



<-}>'. Secondary capitula. 



cr. Crown of carpogonium. 



c.s. Carpospore. 



ct. Cortex. 



i.e. Investing cells. 



in. Internode. 



in. a. Last formed internode. 



in.r. Cortical internode. 



