Contribution. I. 141 



twisted even in a younger state. I take Bh. toriuosum in 

 the same sense as described by Farlow in New Engl. 

 Alg. p. 49, and American, British and Norwegian specimens 

 (the latter collected at Kristiansund) coincide fully with 

 one another. 



The species in question is litoral. It is at first atta- 

 ched to other algse but afterwards forming prostrate strata 

 of conciderable extent, or interwoven tufts among the bran- 

 ches of other algse. At East-Finmarken I have only met 

 with it in rock-pools between tides together with QladopJio- 

 ra gracilis, but at West-Finmarken I have seen it clothing 

 the bottom from about half tide till about 2 fathoms below 

 low-water mark and nearly the same extent in breadth, or 

 some thousand square foot. (Wittr. et Nordst. Alg. exsicc. 

 1. a). The plant appears on open as well as sheltered coasts, 

 but it seems to prefer sheltered places. It is furnished 

 with zoospores in the later half of June and in August. 



Distribution: Probably pretty common along the who- 

 le coast. I have seen it at Syltefjord, Vardo, Kiberg and 

 Pasvig, somewhat local but plentiful. 



Gen. Chsetomorpha Ktitz. 

 Phyc. germ. p. 203. 



Chsetomorpha melagonium (Web. et Mohr) Kiitz. 

 1. c. p. 204 ; Conferva melagonium Web. et Mohr. Keise, p. 194. 



f. typica. 

 Descr. Conferva melagonium "Web. et Mohr. 1. c. 

 Fig. Chaetomorpha Picquotiana Kiitz. Tab. Phyc. 3, t. 58. 

 Exsice. „ melagonium Wittr. et Nordst. Alg. exsice. Nr. 415. 



f. rupincola Aresch. 



Confarva melagonium var. rupincola Aresch. Alg. Scand. exsicc. 

 Nr. 245 a. 



Descr. Conferva melagonium Harv. Phyc. Brit. t. 99, A. 

 Fig. ChEetomorpha melagonium Kiitz. Tab. Phyc. 3, t. 61. 



