Contribution. T. 7 



little known, as only sterile specimens have been found. It 

 grows on similar localities as L. soriferum. 



Distribution : Only found at Mehavn, very rare. 



Lithothamnion intermedium Kjellm. 



N. Ish. Algfl. p. 127. 

 Descr. Lithothamnion intermedium Kjellm. 1. c. 

 Fig. „ „ „ 1. c. t. 4. 



Sublitoral, growing on various bottom on a depth of 

 3 — 15 fathoms water. Most frequently I met it on sandy 

 or clayish bottom on exposed coasts as well as rather shelte- 

 red ones. It occurs mostly in thinly scattered individuals, 

 never, as far as I know, in considerable numbers. Tetra- 

 spore-specimens have been collected in July and August. 



Distribution: The species seems to occure everywhere 

 along the coast. I have taken it at Lebesby, Mehavn, Hav- 

 ningberg and Vardo, but scarce ; Vadso, pretty plentiful ; 

 Rjelmo, rather scarce. 



Lithothamnion glaciale Kjellm. 



N. Ish. Algfl. p. 123. 

 Descr. Lithothamnion glaciale Kjellm. 1. c. 

 Fig, n „ „ 1. c. t. 2-3, 



This species is, in the Polar Sea, one of the largest of 

 the genus. I have seen specimens which had a diameter of 

 about 0.5 m. It is sublitoral and occurs on various depths, 

 though usually on a depth of 10 — 15 fathoms. But I have 

 also met with large and well developed specimens on a depth 

 of only 3—5 fathoms. It prefers sandy and shingly bottom 

 and is most often met with on sheltered places. Tetraspore- 

 specimens have been taken in June, July and August. 



Distribution: Found at Rjelmo, pretty plentiful but lo- 

 cal; Mehavn and Rjollefjord, scarce ; and at Lebesby, local 

 but abundant. 



