6 M. Foslie. 



in sheltered places. Specimens collected in June, July and 

 the earlier half of August were sterile. 



Distribution ; Pretty common along the whole coast 

 but mostly in small numbers. 



Gen. Lithothamnion Phil. 

 Wiegm. Arch. 1, p. 387. 



Lithothamnion soriferum Kjellm. 



N. Ish. Algfl. p. 117. 

 Descr. Lithothamnion soriferum Kjellm 1. c. 

 Fig. n 5 , Kjellm. 1. c. t. 1. 



This species approaches on one side to L. alcicome and 

 on the other side it not seldom assumes a form, in general 

 appearance very much like L. norvegicum. 



The plant is sublitoral and occurs usually on a depth 

 of 10 — 15 fathoms, on open as well as sheltered coasts, but 

 it appears to prefer protected places and it enters to the 

 end of the deeper bays. It grows on sandy and shingly 

 or clay-mingled bottom. I have taken specimens with tetra- 

 spores in June and August. 



Distribution. It seems to be pretty common everywhe- 

 re, and at some places, for inst. Lebesby, abundant. 1 have 

 taken it at Lebesby, Kjollefjord, Mehavn, Vardo and at 

 Kirkenaes in Sydvaranger. 



Lithothamnion norvegicum Aresch. (Kjellm.) 

 N. Ish. Algfl. p. 122 ; Lithothamnion calcareum var. norvegicum 



Aresch. Obs. Phyc. 3, p. 4. 



Descr. Lithothamnion calcareum var. norvegicum Aresch. 1. c. p. 4 — 5. 



Fig. „ norvegicum Kjellm. N. Ish. Algfl. t. 5, fig. 9 — 10. 



I have only met with some few barren specimens of 

 this species. As mentioned before, it seems to be nearly 

 related to the preceding one, and I should be inclined to 

 consider it a form of that species, However, it is a plant 



