130 M - Foslie. 



Spongomorpha spinescens Ktitz. 



Spec. Alg. p. 418. 

 Deter. Spongomorpha spinescens Kutz. 1, c. 



„ „ Kjellm. N. Ish. Algfl. p. 373. 



Fig. n „ „ Tab. Phyc. 4, t. 75. 



Exticc. „ n Wittr. et Nordst. Alg. eisicc. Nr. 115. 



The common form of this species is that one described 

 by Kjellman 1. c, forming «very dense, usually perfect- 

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

 lour, composed of obpyramedical clusters with truncate tops*. 

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

 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. arcta, being in general 3 — 4 cm. long, 

 sometimes attaining 8 cm. 



The species is litoral and occurs only at exposed pla- 

 ces, epiphytic on Gigartina mamillosa in the lower part of 

 the zone. A few specimens were found on rocks together 

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



Distribution: Found at Sveerholt and Vardo, local but 

 abundant. 



Spongomorpha arcta (Dillw.) Ktitz. 



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



f. pulvinata Fosl. 



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



f. typica Fosl. 



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

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

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



n vaucherieeformis Kutz. Tab. Phyc. 3, t. 78. 



„ coniosa Kutz. 1. c. t. 79. 



„ stricta Kutz. 1. c. t. 80. 



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

 „ cymosa Kiitz. 1. c. t. 74. 



