Gontnlmtion, I. 



9 



Lithothamnion circumscriptum Stromf. 



Isl. Algveg. p. 20. 

 Descr, Lithothamnion circumscriptmn Strdnif. L c. 



Fig. 



n 



» 



» 



1. c. t. 1, fig. 4—8, 



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

 a few specimens in rocb-pools between tides^ fastened to 

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

 fathoms, fastened to stenes. Tetraspore-spécimens have been 

 coUected at the end of July. - 



Bistribution \ Found at Mehavn and at Kjelmo in Syd- 

 varanger, rare. Probably it is more commonly spread. 



Lithothamnion polymorphum (L.) Aresch. 



in J. G. Ag. Spee. Alg. 2, p 524; Millepora porymorpha L. Syst. 

 Nat. p. 1385; ex parte, 

 BcsGi'. Lithothamnion polymorphum Stromf. Isl. Algveg. p. 19. 



Fig 



Exsicc* 



ff 



H 



?» 



It 



Haiick, Meercsalg. t 1, fig. 4 

 Aresch. AI2:. Scand. exsicc. Nr. 302. 



Litoral an,d sublitoral. In the litoral zone it most com- 

 inonly occnrs 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 Alariæ but especially smaller algæ. I ha- 

 ve tåken tetraspore-specimens in the beginning of August. 



Distrihution : Pretty coramon all along the shore, at 

 some places rather abundant. 



Gen. Lithophyllum (Phil.) Rosan. 



Mclob. 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. Spee. Alg, 

 2, p. 514. 

 Beser, Lithophyllum Lenormandi Rosan. 1 c. p. 85 



p^- 



;t 



» 



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



v i 



