401 



Fig. 385. 



Chrysymenia 



pyrifonnis 



Borgs. 



A little magni- 

 fied (about 



this cortical layer leaves a space free over the 

 middle of the large cells, while in older vesicles 

 the cortical cells very often cover them completely. 

 The wall of the vesicles is about 90 p thick. The 

 cavity in the interior is filled with mucilage. 



A transverse section of the solid stem (Fig. 

 387) shows great likeness to that of Chrysymenia 

 microphysa Hauck as drawn by KUCKUCK (1. c., 

 p. 210). The cells are largest in the middle, de- 

 creasing gradually towards the periphery. 



On the inner side of the large cells, facing the 

 cavity in the interior of the vesicles, we find 

 here and there groups of gland-cells (Fig. 386 A, C). 

 These are pear-shaped, occurring from two to about 

 eight together in a bunch. Sometimes, too, a 

 solitary gland-cell is present. The cells bearing the 

 gland-cells are mostly smaller than the surround- 

 ing cells. 



Only sterile plants have been gathered. 



Compared with Chrysymenia microphysa Hauck - of which 

 we have a detailed description since I described this species 

 by the late Prof. KUCKUCK our plant differs essentially 



by its larger size, 

 larger and different- 

 ly shaped vesicles of 

 which the Mediter- 

 ranean plant most- 

 ly bears but a single 

 terminal one upon 

 each stem. Further- 

 more, glands are 

 not found in the Me- 

 diterranean plant. 

 Of the hitherto 

 known Chrysyme- 

 ma-species in the 

 West Indian waters 

 this plant comes, 

 as I have already 



Fi S- 386 - Chrysymenia pyriformis Borgs 

 A, transverse section of the wall, in the middle a 

 ce ii with glands (70:1). B, part of the wall seen 

 from the surface (70:1). C, large cells of the wall 

 facing the cavity, one of the cells with glands 



26 



