— 196 — 



The following remarks are based upon the rather scarce ma- 

 terial I have had at my disposal. 



The membrane consists of a single layer of nearly square- 

 shaped cells in transverse section (Fig. 14 A, C, I); they have a 

 rather thick outer wall which when in water often swells greatly. 

 The diaphragms at the constriction of the thallus consist of a 

 single layer of cells of an irregular, polygonal form seen from the 

 surface (Fig. 14 A), more rectangular in transverse section (Fig. 

 14 B). 



On the inner side of the membrane we find the vertical fila- 

 ments (Fig. 14 5, i)) very often in quite close connection with the 



Fig. 14. Champia salicornioides Harv. 



A, transverse section of the membrane (to the left), to the right part of the diaphragm 

 seen from above (50 : 1). B, transverse section of the diaphragm, to the left with a part of 

 the membrane (30 : 1). C, transverse section of the membrane and a filament with a gland 

 (50 : 1). D, the membrane seen from the innerside with filaments (30 : 1). E, membrane- 

 cells with glands seen from above (150 : 1). f, part of the same in transverse section 

 (150 : 1). G, apex of a branch seen from above (150 : I). B, part of the membrane with 

 tetraspores (50 : 1). /, tetrasporangiimi in section (50 : 1). 



membrane-cells, often even somewhat immersed in their thick wall 

 (Fig. 14 C). The filaments run from the tip of the branches to the 

 bottom and pass through the diaphragms (Fig. 14 A), as a rule 

 constricted very little only or not at all (Fig. 14 B). The cells of 

 the filaments bear one or sometimes two opposite gland-cells (Fig. 

 14 D); these are nearly spherical or somewhat ovate (Fig. 14 C). 



