398 



(Fig. 381). At their base the sacs taper considerebly to an almost 

 acute point, while their summits are broadly rounded. The sacs 

 are nearly cylindrical, sometimes somewhat flattened. 



The wall is rather thin. It consists of a single layer of large 

 cells which, above their transverse walls, are covered by a layer 

 of cortical cells (Fig. 381 E). These are largest just over the trans- 

 verse walls of the large cells growing smaller from here, 



leaving the middle of the 

 large cells uncovered. Seen 

 from above this arrange- 

 ment gives the membrane a 

 very fine, reticular appea- 

 rance. 



A transverse section 

 shows the wall-cells to be 

 roundish -rectangular (Fig. 

 381 C}\ seen from above they 

 are irregularly polygonal or 

 oblong, two three times as 

 long as they are broad (Fig. 

 381, A\ 



On the innerside facing 

 the cavity one of the large 

 cells bears now and then 

 glands (Fig. 381 A, C). These 

 are obovate-oval to pyriform, 

 when seen from the side, 

 and of rather variable size. 



Fig.381. ChrysymeniaEnteromorpha Harv. 

 A, wall-cells facing the cavity, the one 

 near the middle with a group of glands 

 (70:1); B, a cell with glands (70:1); 

 C, transverse section of the wall, one 

 of the cells with glands (70:1); D, glands 

 (70:1); E, part of the wall seen from 

 above (compare the text) (125:1). 



They occur scattered or in 



small groups upon the surface of the mother-cell (Fig. 381 B}. 

 A number of ten or more can be found upon the same cell. 



At the constrictions between the sacs there is a tissue con- 

 sisting in the middle of very large cells covered by smaller ones 

 (Fig. 382 a). From the large cells some small ones forming shorter 

 chains protrude into the cavity of the vesicles. In the upper end 

 of these cell-chains glands sometimes are found. Similar short 

 chains of cells have been observed by KUCKUCK in Chrysymenia 

 microphysa. 



Plants with tetraspores did not occur in my material. But 



