60 



M. Fo.slie. 



* 



form umhilicalis is always litoral and fastened to rocks or 



stones near high-water mark. It is sometimes gregarious, 

 though never in as large numljer as farther south, and it 

 becomes best developed on exposed places, but appears also 

 in ratber sheltered localities. The typical form, on the other 

 band, thrives best on protected places. Specimens with re- 



j 



productive organs have been tåken at the end of June, in 

 July and August. 



Distrihiition: Comraon along the whole coast; atseveral 

 places in rather large number. 



Porphyra abyssicola Kjellra. 



N. Ish. Ålgfl. p. 240. 

 DescY. Porphyra abyssicola Kjellin. 1. c. 

 Fiff. „ » » » t- 17, fig. 4 et t. 18, fig. 10—11. 



Syn. Porphyra mmiata Kleen, Nordi. Alg. p. 23, sec. Kjellm. 1. c, 



Also this species is somewhat variable. "With reference 

 to the form of the frond it resembles Diploderma amplis- 

 simum f. typica, but never as much folded as that species. 

 I have even seen specimens which were q_uite smooth. The 

 largest one I have collected had a length of 28 cm. by 12 

 cm, in breadth in its broadest part. Yet it is generally much 

 sma^ler, and I have not seldom met with individuals bearing 

 reproductive organs, which were only 3 cm. Jong. Sterile 

 individuals are rather difficult to distinguish from certain 

 forms of P. laciniata. 



The plant is sublitoral, appearing on a depth of 5 — 16 

 fathoms, most commonly attached to other algae, as Ptilota 

 pectinata, Euthora eristata, Rhodophyllis dichotoma, Odonthalia 



r 



dentata and DesmareJia acuelata. It has only been found 

 on open coast. Specimens with reproductive organs have 



ri 



been collected in the later half of June, in July and in the 

 earlier half of Au^mst. 



Distrihution: Found at Kjollefjord and Sværholt, scanty; 



lÆébavu, rather scapce, Berleyaag aud Vardo, east Q|i s|j9re 



