511 



or rarely 2 — 3 together, and have small zoospores. The thicker bran- 

 ches are from 135 lo 170 [i thick. This plant undoubtedly comes 

 very near A. albescens. 



Grows in sheltered localities between tide-marks, and fruiting 

 specimens were found in May. 



Found hitherto only on S trom o Kalbakfjord ;il the exit of ;i 

 stream; Syd.: Tværaa (!). 



Fig. 105. Acrosiplmnia /layellata Kjellm.? Compare text. a JO : 1 ; b, c. d, e 75 : 1 ; / 180 : 1. 



188. A. flagellata Kjellm.? 



In figs. 104 and lOo I have given the illustration of an Acrosi- 

 phonia, which has sometimes a few single fertile cells, sometimes 

 u[) to 20 together in a continuous row. As shown in the figure 

 the fertile cells are intercalary, and the zoospores small, hence the 

 plant belongs to the snb-genus Melanarthrum Kjellm. The chroma- 

 tophore is rather finely recticulate, with numerous pyrenoids (fig. 105/). 



The thicker main branches are ahont 135 /< thick; growing shoots, 

 particularly vigorous, attain to a thickness of some 120/« just below 



