PLATE II. 



(TERMINATION AND EARLY STAGES IN THE DEVELOPMENT OF A 

 CHAROPHYTE, AFTER DE BARY AND KAMIENSKI. 



FIG. 



1. Oospore in which a septum has formed, cutting off the 



nodal-cell (a). x 60. 



2. Oospore showing nodal-cell (a) beginning to swell, 



splitting the apex of the shell, x 60. 



3. Nodal-cell showing first subdivision, x 200. 



4. Oospore from which the pro-embryo (P.) and primary 



root (P.R.) are beginning to emerge. x 60. 



5. Further stage in the growth of these organs, x c. 53. 

 6, 7. Later stages when pro-embryo is becoming septate. 



In fig. 7 an accessory root (a.r.) is shown. x c. 53. 

 8. Young Chara-plant, showing pro-embryos, root system 

 and sexual shoot. 0., oospore. P. R., primary root. 

 r.n.) node of the same, a.r., accessory roots arising 

 from division of nodal-cell. P., primary pro-embryo. 

 P'., accessory pro-embryo arising from division of 

 nodal-cell. P"., accessory pro-embryo arising from 

 root-node of primary pro-embryo, p.r.n., root-node 

 of primary pro-embryo, a.r' '., accessory root arising 

 from the same, w.n., node originating pro-embryonic 

 whorl, t.p., terminal process of pro-embryo. S.P., 

 sexual plant, x c. 5. 



9-16. Successive stages in septatioii of node originating the 

 pro-embryonic whorl, from which the sexual plant 

 arises (see explanation in text), h., halving wall. 

 i.j initial cell, n., a nodal-cell giving rise to sexual 

 plant. In fig. 10 the section is reversed, the initial 

 cell being shown on the left side of the halving wall 

 instead of on the right as in the other figures. 

 x 100. 



Figs. 1-4, Chara vulgaris ; 5, 6, 8, C. canescens ; 7, Toly- 

 pella glomerata ; 9-16, C. aspera. 



