3 o8 



F. BORGESEN 



distinct rows; inwards the cells gradually increase in size forming an even transi- 

 tion to the medullary tissue. On the cross section this is composed of 

 roundish cells. 



A longitudinal section (Fig. 56 b) of the stem shows that the cells of the 

 cortical layer are of nearly the same shape: roundish to oval. The cells of 

 the medullary tissue on the other hand are long, subcylindrical with oblique 

 cross walls. Between the long cells short ones, often arranged in rows, are 

 interposed here and there. 



OO 



Fig. 50. Chrysymenia Skottsbergii nov. spec, a cross, b length section of stipes; c cross section 

 through wall of vesicle; d inner surface of wall of vesicle with a cluster of glands; e two- 

 celled gland. All c. 180 /i. 



A cross section of the vesicles (Fig. 50 c) shows that the wall consists of 

 a single layer (rarely two) of large rounded-rectangular cells, which are covered 

 by a cortical layer of small cells. Opposite the centre of the large cells one 

 or two cortical layers are present, while opposite the cross walls separating 

 the large cells, where more space is left, we find this space occupied by a 

 cell larger than the cortical ones. 



Seen from above the large cells in the wall of the bladder are polygonal 

 with rounded corners (Fig. 50 d). The cavity is filled with mucilage. On the 

 inner side of the wall, facing the cavity, we find the glands characteristic of 

 Clirysymenia. These occur in groups (Fig. 50 d), but not in great number. 



