Contribution. I. 9 ' 



Lithothamnion circumscriptum Stromf. 



Isl. Algveg. p. 20. 

 Descr. Lithothamnion circumscriptum StrOmf. 1. c. 

 Fig. „ „ „ 1. c t. 1, fig. 4-8. 



Of this plant, before only found at Iceland, I met with 

 a few specimens in rock-pools between tides, fastened to 

 shells, and within the sublitoral zone, on a depth of 5 — 10 

 fathoms, fastened to stones. Tetraspore-specimens have been 

 collected at the end oi July. 



Distribution : Found at Mehavn and at Kjelmo in Syd- 

 varanger, rare. Probably it is more commonly spread. 



L i t h o t ha mnion polymorph um (L.) Aresch. 



in J. G. Ag. Spec. Alg. 2, p 524; Millepora polymorpha L. Syst'. ' 

 Nat. p. 1285 ; ex parte. 



Descr. Lithothamnion polymorphum Stromf. Isl. Algveg. p. 19. ■ ■''• 



Fig „ „ Hauck, Meeresalg. t 1, fig. 4 



Exsicc. „ „ Aresch. Alg. Scand. exsicc. Nr. 302. 



Litoral and sublitoral.. In the litoral zone it most com- 

 monly occurs in rock-pools, and in the sublitoral zone chiefly 

 on a depth of 3 — 5 fathoms, but it also descends to a depth 

 of 10 fathoms water. It sometimes grows gregarious, cove- 

 ring rather large spaces of the bottom, and often serves as 

 a substratum for Alarice but especially smaller algse. I ha- 

 ve taken tetraspore-specimens in the beginning of August. 



Distribution : Pretty common all along the shore, at 

 some places rather abundant. 



Gen. Lithophyllum (Phil.) Rosan. 

 Melob. p. 79; Phil. Wiegm. Arch. 1, p. 385; lim. mut. 



Lithophyllum Lenormandi (Aresch.) Rosan. 



1. c. p. 85 ; Melobesia Lenormandi Aresch. in J. G. Ag. Spec. Alg. 

 2, p. 514. 



Descr. Lithophyllum Lenormandi Rosan. 1. c. p. 85 

 Fig. „ „ „ 1. c. 1 5, fig. 16-17 ; t. 6, fig. 1-3. 



