4 



GENERAL DIFFERENTIATION OF THE PLANT-BODY 



name indicates, the features of a foliose liverwort even to the oblique position of 

 its 'leaves' (Fig. 17). That these 'leaves' are expanded short shoots is shown by 

 a comparison with Cliftonaea pectinata (Fig. 16), another member of the Florideae, 

 in which (see the left side of the figure) two rows of short shoots are visible. 



FlG. 15. Plocamium coccineuin. The. apices of the 

 branches at ffi, //o, //jj, have developed adhesive disks by 

 which the plant is attached to another alga, L. 



FlG. 16. Cliftonaea pectinata. 

 End of a shoot. The short shoots 

 corresponding to the leaves of Poly- 

 zonia stand approximated to the 

 under side (.left). Magnified. 



FlG. 17. Polyzonia jungermannioides, one of the Florideae. Habit of plant. 

 Viewed from above, except on the right where a portion is seen in side view. 

 Slightly magnified. 



In Polyzonia also there is an axillary position of the lateral shoots which is the 

 rule in the higher plants ; each lateral shoot arises at the base of a ' leaf.' A similar 

 relation between short shoots and long shoots occurs also in other Florideae \ 



See Kny, tJber Axillarknospen bei Florideeu. Berlin, 1873, 



