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Contribution. I, 



47 



stunted one produced by unfavourable conditiona of life, and 

 it passes gradually into the typical form witliout any limit. 



The present plant is at East-Finmarken, as far as I have 

 seen, always sublitoral, and appears in the upper as well as 

 in the lower part of the zone, attached to Lithothaynnia and 

 Shells of Balanidæ. Solitary specimens have also been found 

 fastened to Delesseria sinuosa, Ptilota plumosa and the root- 

 tuft of Polysiphonia arctica, Sometimes it grows gregarious 

 hut not in large number. It is best developed in much ex- 

 posed localities, and does not enter into the deeper bays. I 

 have coUected specimens with tetrasporangia in the middle 

 of June at KjoUefjord, rather richly; at Mehavn at the end 

 of June, sparingly; and at Berlevaag in the middle of Jtily, 

 rather richly. 



Distribution: Commonly spread but scarce along the 

 unsheltered coast; at Berlevaag found in considerable abun- 

 dance on an iron buoy. 



Antithamnion boreale Gobi (Kjellm.) . 



N. Tsh. Å^gfl. p. 226; Antithamnionplumula var. boreale Gobi, Algenfl. 

 Weiss. Meer. p. 47. 



f. typica Kjellm. 



N. Isli. Algfl. p. 226. 

 I>escr. Antithamnion plumula var. boreale Gobi ]. c. p. 47 et sequent. 



Fig- 



boreale f. typica Kjellm. I. c. t. 16, fig. 2—3. 



f. coralUna Rnpr. (Kjellm.) 



T>escr, Callitliamnion corallina Eupr. Alg. Och. p. 340. 



Fig. 



Antithamnion corallina Kjellm. Algenw. Murm. Meer. p. 24. 



n 



boreale f. corallina Kjellm. N. Ish. Algfl. 1. 16, fig. 4—5. 



Syn. Antithamnion plumula Kjelhn. Spetsb. ThalK 1, p. 26. 



V 



I have only seen a comparatively small number of thifl 

 species, and especially at East-Finmarken it is dwarfed, sel- 

 dom, if ever, reaching more than 3 — 4 cm. in height, most 

 commonly about lem. It is often very difficult to distinguish 

 from A» Pylaisæh particularly when growing together with 



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