130 



M. Foilic, 



Spongomorpha spinescens Ktitz. 



Spee. Alg. p. 418, 

 Descr. Spongomorpha spinescens Kutz. 1. c. 



» 



Kjellm. N. Ish. Algfl. p. 373. 



„ Tab. Phyc. 4, t. 75. 

 "Wittr. et Nordst. Alg. exsicc. Nr. 115 



Fiff, 



Exsicc, 



The common form of this species is that one described 

 by Kjellm an 1. c, forming cyery dense, usually perfect- 

 ly spherical, or flattened spherical balls of light-green co- 

 lour, composed of obpyramedical dusters with truncatetops». 

 Besides I also met with a form composed of looser dusters, 

 resembling certain forms of S. arcta, and sometimes approa- 

 ching this species also with reference to the ramification. 

 However it appears to be a pretty well marked species. It 

 is smaller than S. arda, being in general 3—4 cm. long, 

 Bometimes attaining 8 cm. 



The species is litoral and occurs only at exposed pla- 

 ces, epiphytlc on Gigartina mamillosa in the lower part of 

 the zone. A few specimens were found on rocks together 

 with S. arda. It is furnished with zoospores in August. 



Distribution: Found at Sværholt and Vardo, local but 



abundant. 



Spongomorpha arcta (Dillw.) Klitz, 



Spee. Alg. p. 417; Conferva arcta Dillw. Brit. Conf. Suppl, p. 67. 



f. pulvinata Fosl. 



in Wittr. et Nordst. Alg. exsicc. Nr. 614. 



f. typica Fosl. 



in Wittr. et Nordst. Alg. exsicc. Nr, 612. 

 Descr. Conferva arcta Arescli. Pliyc. Scand. p. 426. 

 Fig- Ciadophora arcta Harv. Phyc. Brit. t. 135. 



f, vauclicriæformis Kiitz. Tab. Phyc. 3, t. 78. 



„ ^ comosa Kiitz. 1. c. t. 79. 



stri eta Kiitz. 1. c. t. 80. 



TV 



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



ff 



cymosa Kiitz. L c< t. 74. 



\ 



