70 Note on a Species of Chara. 
one another by two rows of plain cells (cf. Rabenhorst, Bd. V., 
Fig. 16). 
The chief interest lies in the spines, which are developed from 
the nodal cells of the “ middle rows ” of the cortex lobes. 
A median longitudinal section of a young internode (Fig. 68) 
shews the ascending and descending lobes to be already divided up 
into nodal (u) and internodal cells (i), the nodal cells having cut off 
by a tangential division a head cell ( k ) from which in some cases a 
spine ( 5 ) has already been produced. 
Owing to the ascending lobe being older than the descending 
one, it is in all cases found to be in the more advanced stage of 
development, as a comparison of the spines from the two lobes will 
shew. 
The spines of both ascending and descending lobes are deve¬ 
loped in regular acropetal succession, and are impressed with the 
direction of growth of their respective parental lobes. 
Fig. 70 . 
All internodal cell about the seventh from the growing point, shewing 
branches [B] given off from the nodal complex; the distribution of 
starch is indicated by dots. 
