Contribution. I. 123 



metimes again bear some branch of second order. I have 

 also met with a transition between this form and the typi- 

 cal one. Provisionally I refer to the present species a sim- 

 ple dark green Enteromorpha, which, with regard to the 

 structure, differs rather much from E. compressa, such as 

 the species is characterized by Ahlner. 



The species in question occurs on rocks or in rock- 

 pools within the litoral region. Specimens collected in the 

 middle of July were sterile. 



Distribution: Found at Berlevaag, pretty plentiful but 

 local, and at Kiberg, rather scarce. 



Enteromorpha complanata Ktitz. 

 Specc. Alg. p. 480; Cfr. Ahln. Enterom. p. 25. 



f. subsimplex (Aresch.) Ahln. 



1. c. p. 28; Enteromorpha compressa var. subsimplex Aresch. Alg. 

 Scand. exsicc. Nr. 177. 



Descr. Enteromorpha complanata var. subsimplex Ahln. 1. c. p. 28. 

 Fig. „ „ „ „ „ „ fig. 2 c. 



Exsicc. „ compressa „ „ Aresch. Alg. Scand. ex- 



sicc. Nr 177. 

 Syn. Enteromorpha compressa a subsimplex J. G. Ag. Alg. Syst. 



B, p. 137. 



The Finmarkian specimens agree well with the above 

 quoted form distributed by Areschoug. The plant be- 

 comes here until 60 cm. long. It grows in rock-pools or 

 shallow sandy pools between tides. Specimens taken in 

 July have been sterile. 



Distribution: Found at Berlevaag and Mehavn, pretty 

 plentiful. 



Enteromorpha usneoides (Bonnem.) J. G-. Ag. 



Alg. Syst. 3, p. 157; Ulva usneoides Bonnem. sec. J. G. Ag. 1. c. 

 Descr. Enteromorpha usneoides J. G. Ag. 1. c. 

 „ plumosa Ahln. 1. c. p. 37. 



Ti§. , „ fig. 4, 



