508 



3 fertile cells at most are to be found in a row. This was the 

 case also with a part of the material, which I examined, but some 

 of the specimens had long rows of fertile cells, as many as 25 at 

 least in a continuous row (cfr. fig. 103 c, /*). The chromatophore in the 



Fil,'. 103. Acrosiphonia albescens Kjellm. Compare tcxt. Fig. o—/; 40:1, g. 150:1. 



specimen figured (fig. 103 ^7) is reticular, with many small roundish 

 holes and with numerous pyrenoids, other specimens had larger 

 reticular chroinatophores. The hole through which the zoospores 

 escape is large and has a dislinctly crenated margin. The main 

 brancb of the different species varied in thickness from 70 — 100 1*. 

 So far as I can see, the Acrosiphonia Traillii described by Bat- 



