CLASSIFICATION OF PROTOCOCCUS. 



Kingdom Plantaj, because it possesses a cellulose wall, absorbs C0 2 and evolves 0. 

 Sub-Kingdom Thallophyta, 

 Group Algae. 



CHABA. 



Fio. 1 (). Showing 



. f Nodes (L. nodus, a knot). 



1 Internodes (L. inter, between). 



. f Leaves arranged in whorls. 



APPENDAGES < , 



I Branches. 



TERMINAL BUD < 



( Nodes. 



BRANCH . . < Internodes. 

 I Appendages. 

 Nodes with their leaves. 

 Shor.t internodes. 



Fio. 1 (//). Showing the CORTICAL LAYER INVESTING THE INTERNODAL CELL (L. cortex, bark). 

 FIG. 2. TRANSVERSE SECTION OF INTERNODE. Showing 

 Cortex. 



Wall of internodal cell. 

 Protoplasm lining the wall, the so-called primordial utricle (L. primordius, original ; utriftilits, 



a little bag). 



Chlorophyll granules arranged so as to leave an uncoloured portion, the neutral line. 

 Inner layer of protoplasm the moving layer. 

 Vacuole, filled with cell-sap. 

 FIG. 3. Showing the NODE 



A surface of cells one layer thick. 

 FIG. 4. THE TERMINAL BUD DISSECTED TO LAY BARE THE GROWING POINT. Showing 



The hemispherical apical cell. It grows in length and multiplies by division transverse to the axis. 

 The cell immediately beneath apical cell afterwards divides transversely into two portions the 



lower an internode, the upper a node. 



The internodal cell (blue). It elongates, but does not divide at all. 

 The nodal cell (uncoloured). It does not elongate, but divides parallel to the axis, so as to form 



a transverse partition of cells. 

 Nodal cell originating a young leaf. 

 Nodal cell originating the cortex. 

 FIG. 5. PORTION OF LEAF. Showing 



The uncovered apical or terminal cell 

 Nodal cell. 



Cortex j Descending lobes. 

 I Ascending lobes. 

 FIG. 6. MOVEMENTS OF THE PROTOPLASM 



The arrows represent the direction of the currents of protoplasm. 

 The uncolonred bands are the neutral lines (see fig. 2). 



DIAGRAM I. Showing FORMATION OF CORTEX. 



The peripheral cells of the node (shown in fig. 3) send pockets upwards and downwards to 

 form the ascending and descending cortical lobes. 



