KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. Zed 
remain long. They taper much toward the base, and, as is usual in the hairs of the 
Fucoidew, their lower cells are short and richly provided with endochrome. The sorus 
occupies the same position as in Ph. derimatodea, 
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. 
Geoyr. 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, Smeerenberg 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 (Lamoun.) J. G. AG. 
Lam. p. 7; Lamour. Ess. p. 40; char. mut. 
Laminaria solidungula J. G. Ag. 
Spetsb. Alg. Bidr. p. 3. 
Deser, Laminaria solidungula J. G. AG. Lam. p. 8. 
» » KsELLM. Spetsb. Thall. 2, p. 15. 
Fig. » » J. G. Ac. Spetsb. Alg. Bidr. t. 1. 
» » Kyetim. |) c. t. 1, fig: 1. 
Syn. Laminaria solidungula J. G. Ac. 1. ¢.; Gronl. Alg. p. 110; Gronl. Lam. och Fue. p. 1. 
» » Kse.im. |. ¢.; Vinteralgv. p. 64; Algenv. Murm. Meer. p. 36; Kariska bafvets 
algv. p. 24. 
Halitat. 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 
Laminariacee, 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 developed most abundantly 
in the month of January. However, specimens with zoosporangia are met with as carly 
as in November and the formation of zoospores is vigorously continued as late as in 
