Contrilbution. t. 



141 



twlsted even in a yonnger 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 coUected at Kristiansund) coincide fuUy with 



one another. 



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

 ched to other algæ but afterwards forming prostrate strata 

 of conciderable extent, or interwoven tufts among the brån- 

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

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

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

 but it seems to prefer sheltered places. It is fumished 

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



Distnbution: Probably pretty common along the who- 

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

 Pasvig, somewhat looal but plentiful. 



Gen. Chætomorpha Ktitz, 



Phyc. germ. p. 303. 



Chætomorpha melagonium (Web. et Mohr) Ktitz. 



1. c. p. 304 j Conferva melagonium Web. et Mohr. Beise, p. 194. 



f. fypica. 



Beser. Conferva melagonium Web. et Mohr. 1. c. 



Fig. Chætomorpha Ficqnotiana Kiitz. Tab. Phyc. 3, t. 58. 



Exsicc, „ melagonium Wittr. et Nordst. Alg. exsicc. Nr. 415, 



f. rupincola Aresch. 



Confsrva melagonium var. rupincola Aresch, Alg. Scand. exsicc 



Nr. 245 a. 



Beser. Conferva mclogonium Harv. Phye. Brit. t. 99, A. 



Fig, Chætomorpha melagonium Kiitz. Tab. Phyc. S, t. 61, 



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