Contribution. I. 135 



The present plant is litoral and grows in rock-pools at 

 high-water mark attached to Cladophora rupestris f. subma- 

 rina. Specimens collected in July were sterile. 



Distribution: Found only at Pasvig in Sydvaranger, 

 rare. 



Gen. Cladophora Ktitz. 



Phyc. gener. p. 262. 



Cladophora rupestris (L.) Kiitz. 



Phyc. gener. p. 270; Conferva rupestris L. Spec. PI. p. 1167. 



f. typica. 

 Descr. Cladophora rupestris Harv. Phyc. Brit. t. 180. 

 Fig. n „ Kiitz. Tab. Phyc. 4, t. 3. 



„ „ Harv. 1. c. 



Exsice. Conferva „ Aresch. Alg. Scand. exsicc. Nr. 126 et 269. 

 Cladophora „ Wittr. et Nordst. Alg. exsicc. Nr. 117. 



„ „ f. typica Wittr. et Nordst. 1. c. Nr. 618 et 



927. 



f. submarina Fosl. 

 in Wittr. et Nordst. Alg. exsicc. Nr. 619. 

 Descr. Cladophora rupestis f. submarina Fosl. 1. e. 

 Exsicc. „ „ h m * et Nr. 928. 



Syn. Conferva rupestris Wg. Fl. Lapp. p. 512. 



„ „ Lyngb. Hydr. Dan. p. 156. 



„ „ Sommerf. in Act. Nidros. p. 27. 



This alga at the coast of East-Finmarken never grows 

 so luxuriant as farther south. It attains a length of about 

 12 cm. but it is in general much smaller. The typical 

 form lives on rocks or in rocks-pools in the lower part of 

 the zone, mostly at low-water mark, and f. submarina in 

 brackwater-pools at or a little above high-water mark. The 

 plant thrives best on open coast, and it bears zoospores in 

 August. At Nordland I have taken zoospore-specimens i^ 

 tb& beginning of March, 



