4 ARKIV FÖR BOTANIK. BAND 17. N:0 13. 



the method of reproduction were very rare but instances 

 were observed where there had been a division of the cell 

 contents into two parts and into four parts. In one of the 

 latter there was a dark refractive body that suggests very 

 much an eye-spot (fig. 6). It seems probable, therefore, that 

 reproduction is by zoospores, although the evidence is by no 

 means conclusive. 



Since the method of reproduction is in doubt the syste- 

 matic position of the alga is also uncertain. Assuming that 

 reproduction is by zoospores the alga should be placed in 

 the Palmellaceae. If this is the case it is the first member 

 of the family with the gelatinous envelope forming setae. 

 The breaking of the cell wall into two parts at the time of 

 reproduction is a feature that is frequently found in the 

 Palmellaceae, whereas in the Autosporaceae there is usually 

 a slit-like opening for the liberation of the new plants. 



The genus is dedicated to the well known student of 

 the freshwater algae, Dr. 0. Borge of Stockholm. 



Schizochlamys solitaria sp. no v. Figs. 11—16. 



Cells solitary, free floating, enveloped in a wide hyaline 

 homogeneous spherical gelatinous sheath. Cells spherical, 

 with a single cup-shaped chloroplast that contains one py- 

 renoid. Cell wall smooth, with a single thickened nodule 

 that usually lies opposite the apex of the chloroplast. Cell 

 division usually into two daughter cells that are liberated 

 through a pore in the old mother cell wall. 



Diameter of cells without gelatinous envelope 5,5 — 8,5 a, 

 with envelope 15 — 25 ji. 



The association of the old cell wall with the new cells 

 shows that the alga belongs to Schizochlamys. The behavior 

 of the wall at the time of reproduction resembles 8. deli- 

 caiula W. West where the wall remains entire, instead of 

 8. gelatinosa A. Br. where the wall breaks into two or four 

 pieces. 



The species differs from the other members of the genus 

 in the solitary habit of the cells and the peculiar nodule on 

 the cell walls. This nodule is usually opposite the apex of 



