10 



Dansk Botanisk Arkiv, Bd. 2. Nr. 2. 



are terminated with long hairs consisting at the end of long and 



nearly colourless cells and having a growing-point at their base. 



The ramification is very irregular being sometimes nearly 



secund, sometimes alternating, just as the distance between the 



Fig. 6. Ectocarpus coniferus nov. spec. 



a, part of thallus with a few plurilocular sporangia in each angle of branch. 



b, part of thallus with a plurilocular sporangium upon the main branch. 



c, plurilocular sporangia, d, unilocular sporangium, e, base of a filament. 



f, cell with chromatophores. 

 [a, b, e, about 50 : 1 ; b, c, d, about 90 : 1 ; f, about 250 : 1). 



insertions of the branches is much variable. Some of the branches, 

 especially in the lowermost part of the thallus, grow out to 

 filaments like the main filaments ; the others, especially the upper- 

 most, are not branched or have only a single or few ramuli. 



