K0N6L. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 177 



from the outer Norse Isle and on the north-western coast of Spitzbergen, f. litoralis 

 from the Norwegian Polar Sea at MaasO. 



Gen. Oallithamnion (Lyngb.) Thur. 



in Le Jol. List. Alg. Cheib. p. 1.7; Lynqb. Hydr. Dan. p. 123; lira. rant. 



Oallithamnion polyspermum Bonnem. 

 in Ag. Spec. Alg. 2, p. 169. 



Descr. Callithamnion polyspermum J. G. Ag. Epicr. p. 32. 

 Fig. Phlebothamnion polyspermum Kiitz. Tab. Phyc, 11, t. 97. 

 Syn. Callithamnion polyspermum Kleen, Nordl. Alg. p. 22. 



Remark on the determination of this species. The individuals from the Polar 

 Sea that I have seen, agree more with the quoted figure in Kutzing, than with 

 the figure on pi. 231 in Harv. Phyc. Brit. They differ from Engli.sh specimens by 

 being less decompound, so that those branch-systems which are called plumulce in 

 the descriptions are comparatively rare, being supplied by simple branches. From this 

 cause those arctic specimens present an aspect differing from typical C. polyspermum. 

 However, they ought probably to be referred to this species. This is also the opinion 

 of Kleen. 



Habitat. Pelagic, growing scattered, fastened to literal algae, as Polysiphonia fasti- 

 ffiata, Furcellaria fastigiata, and Rhodymenia palmata. It has been found with scarce 

 tetrasporangia at Nordlanden in August. 



Geogr. Distrib. Found only within the Atlantic region of the Polar Sea. 

 Locality: The Norwegian Polar Sea: Nordlanden in several places. This is the 

 northernmost place where it is known to grow. 



Callithamnion Hookeri (Dillw.) Ag. 



Spec. Alg. 2, p. 190. Conferva Hookeri Dillw. Brit. Coiif. t. 106 sec. Ag. 1. c. 



Descr. Callithamnion Hookeri J. G. Ag. Epicr. p. 33. 

 Fig. Phlebothamnion Hookeri KtJTZ. Tab. Phyc. 11, t. 94. 

 Esusicc. Callithamnion Hookeri Aresch. Alg. Scand. exsicc. N:o 311. 

 Syn. Callithamnion Hookeri Kleen, Nordl. Alg. p. 21. 



Habitat. In that part of the Polar Sea where it has been as yet observed, this 

 plant is litoral, growing attached to Polysiphonia fastigiata. It has been found here 

 with tetrasporangia in June, with sporocarps in July. 



Geogr. Distrib. Known only from the southern border of the Polar Sea. 



Locality: The Norwegian Polar Sea: Nordlanden at Bod5. 



K. Vet. Akad. Handl. Bd 20. N:o 5. ^" 



