192 



Icelandic Fucacese , very gregarious on rocky coast, but occurs also 

 scattered on gravelly or clayey ground in the innermost part of fjords. 

 It is most frequently found at half-tide level and a little above it. It at- 

 tains a length of about 1 m. and is rather variable. Specimens without 

 bladders (f. evesiculosa) have been found here and there, and in pools in 

 the literal region it occurs with thin and narrow frond (a form analogous 

 to f. linearis of F. intlatus). For the rest following forms are recognizable 

 in my material: 



Fig. 25. Fucus vesiculosus L. f. sphcerocarpa J. Ag. 1:1. 



f. tiipica, agreeing with the figure in Harv. Phyc. Brit. Tab. 204, is 

 rather common. 



f. fnrgida Kjellm. is found here and there and 



f. siihcerocarpa J. Ag., fig. 25, is the most common. 



Specimens with receptacles have been found in February— October; 

 the species is common elsewhere along the coasts. 



At SkerjafjorQur in SW. Iceland, I met with some sterile specimens 

 most resembling f. typica, which had a serrated margin in the upper- 

 most part of the segments. 



