304 KJELLMAN, THE ALG^. OF THE ARCTIC SEA. 



Fam. CONFERVACE^ (Ac.) Wittr. 



PI. Scand. p. 16. Confervfe genuinse Ag. Syst. Alg. p. XXV; gen. exol. 



Gen. Spongomorplia Kutz. 



Phyc. gener. p. 273. 



Spongomorpha spinescens Kutz. 



Spec. Alg. p. 418. 

 Descr. Spongomorpha spinescens KiJTZ. 1. c. 

 Fig. » » » Tab. Phyc. 4. t. 75. 



Exsicc. » » Kjellm. in Wittr. et Nohdst. Alg exsicc. N:o 115. 



Addition to the description of this specie,". It. is to be added to Kutzing's descrip- 

 tion of this species, that it forms very dense, usually perfectly spherical or flattened- 

 spherical balls of light-green colour, composed of obpyramedical clusters with truncate 

 tops. The numerous curved or spiral spine-shaped branches are characteristic of this 

 species, connecting together with the rhizoids the particular branchsystems and clusters 

 into dense masses. 



Habitat. This is a litoral alga growing gregarious in great numbers on exposed 

 coasts, attached to other algae, most often to Gigartina mamillosa, sometimes to Halo- 

 saccion ramentaceum. I have collected specimens with zoospores in July on the coast 

 of Finmarken. 



Geogr. Distrib. It is known only from the Norwegian Polar Sea, where it was very 

 abundant at one place and occurred commonly in suitable localities. The most northern 

 point where it has been found is Gjesvser about Lat. N. 71°. 



Locality: The Norwegian Polar Sea: Finmarken at Maaso, rather local and scarce; 

 Gjesvser common and abundant. 



Spongomorpha arcta (Dillw.) Klftz. 

 Spec. Alg. p. 417. Conferva arcta Dillw. Brit. Conf. Suppl. p. 67. 

 Descr. Conferva arcta Aresch. Phyc. Scand. p. 426. 

 Fig. Cladophora arcta Harv. Phyc. Brit. t. 135. 



Spongomorpha arcta KiJTZ. Tab. Phyc. 4, t. 74. 

 » centralis » » » 4, t. 80. 



» cymosa » » » 4, t. 74. 



Cladophora comosa » » » 3, t. 79. 



11 sacculifera » » » 3, t. 81. 



» stricta » » » 3, t. 80. 



» vaucheriseformis » » 3, t. 78. 



R.rsici\ Cladophora (Conf.) arcta Aresch. Alg. Scand. exsicc. N:o 129, 334, 335. 

 Spongomorpha arcta Wittr. et Nordst. Alg. exsicc. N:o 114, 310, 413. 

 Syii. Cladophora arcta Croall, F1. Disc. p. 461. 



• Dickie, Alg. Sutherl. 1, p. 143; Alg. Cumber!, p. 239. 

 I) " Gobi, Algenfl. Weiss. Meer. p. 85. 



