KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 227 



remain long. They taper much toward the base, and, as is usual in the hairs of the 

 Fucoidecu, their lower cells are short and richly provided with endochrorae. The soruS 

 occupies the same position as in Ph. dermatodea. 



Habitat. The species is sublitoral, growing in small numbers on rocky and stony 

 bottom in 8 — 10 fathoms water. It has been found only on exposed coasts. I have 

 collected young specimens in rather considerable number at Spitzbergen in August and 

 at Novaya Zemlya during the latter part of July. At the same season, however, also 

 older individuals are to be found. I have taken one specimen with zoosporangia in 

 course of development on the coast of Spitzbergen at the end of July. 



Geogr. Distrib. Known only from the eastern part of the Greenland Sea and the 

 eastern part of the Murman Sea. At no point here it attains any greater degree of 

 abundancy. The northernmost place where it has been found is Fairhaven on the 

 north-west coast of Spitzbergen Lat. N. 79° 49'. 



Localities: The Greenland Sea: the west and north coasts of Spitzbergen at Bel- 

 sound, Sraeerenberg Bay and Fairhaven, local and rather scarce. 



The Murman Sea: the west coast of Novaya Zemlya at S. Gusinnoi Cape, local, 

 but rather abundant; Rogatshew Bay, local and scarce. 



Gen. Laminaria (Lamour.) J. G. Ag. 



Lam. p. 7; Lamour. Ess. p. 40; char. mut. 



Laminaria solidungula J. G. Ag. 

 Spetsb. Alg. Bidi-. p. 3. 

 Descr. Laminaria solidungula J. G. AG. Lam. p. 8. 



» » Kjellm. Spetsb. Thall. 2, p. 15. 



Fig. » » J. G. Ag. Spetsb. Alg. Bidr. t. 1. 



» » Kjellm. 1. c. t. 1, fig. 1. 



Syn. Laminaria solidungula J. G. Ag. 1. c; Grbnl. Alg. p. 110; Gronl. Lam. ooh Fuc. p. 18. 



» » Kjellm. 1. c; Vinteralgv. p. 64; Algenv. Murm. Meer. p. 36; Kariska hafvets 



algv. p. 24. 



Habitat. This is a sublitoral alga that seems to prefer a bottom composed of 

 small stones, but occurs also on rocks. It grows only seldom in company with other 

 LaminariacecB, and is then usually to be found in small number. Within the Lithoderma- 

 formation it is more common and plentiful. However, it is never met with in large 

 masses. It flourishes both on exposed and sheltered coasts, in localities with strong 

 current as well as in such where the current is feeble. On the coast of Siberia the 

 development of a new lamina begins at the end of March or the commencement of 

 April, and already at the end of April it has attained a considerable size. 



On the north coast of Spitzbergen the zoospores are developecF most abundantly 

 in the month of January. However, specimens with zoosporangia are met with as early 

 as in November and the formation of zoospores is vigorously continued as late as in 



