KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 235 
size from the other cells of the parenchyme of the lamina; (tab. 25, fig. 7). This seems 
to show that the LZ. saccharina which occurs on our coasts is not the same as the alga 
of the same name which is found on the coast of France. With respect to my list of 
synonyms, it may be remarked that it is founded in certain cases on mere suppositions. 
It is impossible without having access to the original specimens to make out with cer- 
tainty what the different authors have meant by their different Luaminariw. I hope 
however to have in general hit upon the truth. If that is the case, LZ. saccharina in 
its present limitation does not live within the Arctic Sea proper. 
Habitat. This species is sublitoral, growing in 2—10 fathoms water. As most 
other Laminariacee, it prefers rocky bottom and is gregarious. It occurs on exposed 
us well as sheltered coasts. In Musselbay on the north coast of Spitzbergen I found 
during the winter both younger and older specimens, from such as were microscopical 
in size to fully developed ones. Germinating plants were particularly numerous during 
December. On the coast of Spitzbergen the present species bears ripe zoosporangia as 
well during the winter, in November, December, January, February, and March, as 
during the summer. However the formation of zoospores is at its richest in July and 
August. Even on the west coast of Novaya Zemlya I have taken it with zoosporangia 
in July and August. On the coasts of Spitzbergen the change of the lamina appears 
to take place in May and June. 
Geogr. Distrib. This species is known with certainty only from the Spitzbergen 
province of the Arctic region. In the Siberian province it is replaced by L. cuneifolia, 
in the American by L. longicruris, and in the Atlantic by ZL. saccharina. It has been 
found most abundant and luxuriant on the coasts of Spitzbergen. Its northernmost 
known locality is the North Cape of Spitzbergen Lat. N. 80° 31’. 
Localities: The Greenland Sea: the east coast of Greenland at Sabina Isle (7); the 
coasts of Spitzbergen, common and abundant; Beeren Eiland. 
The Murman Sea: the west coast of Novaya Zemlya and Waygats, common and 
abundant. 
The White Sea: probably plentiful. 
The Kara Sea: Uddebay on the east coast of Novaya Zemlya, Cape Palander and 
Actinia Bay pretty plentiful, Cape Tscheljuskin scarce. 
Laminaria atrofulva J. G. Ag. 
Gronl. Lam, och Fue. p. 16. 
Descr. Laminaria atrofulva J. G. Ac. 1. e¢. 
Syn. Laminaria atrofulva J. G. Ac. Gronl. Alg. p. 110. 
Addition to the description of the species. 1 consider this alga, which has been 
described in detail by J. G. AGarpu I. c., to be one of the most characteristic Laminaria 
of the Arctic Sea. I have only to add to the author’s description that this species, as 
well as the next following ones, has the middle layer of the lamina compact, sharply 
defined from the intermediate layer. The latter layer is composed of angular or rounded- 
