Contribution. I. 107 



Descr. Chaetopteris plumosa J. G. Ag. Spec. Alg. 1. p. 41. 

 Fig. „ „ Kiitz. Tab. Phyc. 6, t. 6. 



„ „ Aresch. Obs. Phyc. 3, t. 2, fig. 4. 



„ „ Kjellm. Spetsb. Thall. 2, t. 2, fig. 2—3, 



Exsicc. Sphacelaria plumosa Aresch. Alg. Scand. exs'cc. No. 107. 

 Chaetopteris plumosa Aresch. 1. c. No. 408. 

 Syn. Conferva pennata Wg. Fl. Lapp p. 512; ex parte. 



Litoral and sublitoral. In the former instance growing 

 in rock-pools or on stones at low-water mark. In the lat- 

 ter instance mostly fastened to roots of Laminaria, descen- 

 ding to a depth of 10 — 15 fathoms, on open coasts as well 

 as sheltered ones. It is smaller than farther south, generally 

 2 — 4 cm. high. In the summer I have met with but barren 

 specimens. At Nordland it has been found with zoosporangia 

 in March. 



In Krit. fortegn. p. 121 I have referred Fucus hirsutus 

 Gunn. Fl. Norv. 2, p. 25 to Cladostephus spongiosus, accor- 

 ding to Gunnerus occurring «in mari finm. rarior*. I 

 do not think this species is to be found at the coast of the 

 present Finmarken. It may perhaps have been Chaetopteris 

 plumosa, or, if Cladostephus spongiosus, collected in the most 

 northern part of the present Tromso amt. 



Distribution: Scattered and scarce along the whole coast. 

 Perhaps more commonly diffused within the sublitoral zone 

 than hitherto known. 



Gen. Sphacelaria (Lyngb.) J. G. Ag. 

 Spec. Alg. 1, p. 29; Lyngb. Hydr. Dan. p. 103; spec, e cl. 



Sphacelaria racemosa Grev 



Scot. Crypt. Fl. 2, t. 96, sec. Harv. Phyc. Brit. t. 349. 



f. arctica (Harv.) Rke. 



Ostseefl. p. 40; Sphacelaria arctica Harv. sec. J. G. Ag. GrOnL 



Alg. p. 110. 

 Pes&r. Sphacelaria arctica Kjellm. Spetsb. Thall. 2, p. 34, 



