KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:o 5. 103 
Florula Discoana under the name of Melobesia polymorpha. But having convinced my- 
self, through an examination of the collections of Corallinew brought home by ‘Tu. M. 
Frms from the west coast of Greenland, that L. polymorphum is really to be found in 
Baffin Bay, I think it possible indeed that Croatr’s determination is quite correct. 
Arescuoue |. ¢. records L. polymorphum from Spitzbergen, though with reservation. It 
may be that it occurs really here. But as I have not seen it here myself and as it 
was not to be found among the large collections of Lithothamnia once made here by 
myself, and as moreover L. glaciale at certain stages of its development may exhibit 
great outward resemblance to L. polymorphuwm, I consider myself justified in excluding 
it, at least temporarily, from the Flora of Spitzbergen. That Lithothamnion polymorphum 
which I have myself reported from the Murman and the Kara Seas, belongs to other 
species, as I have already demonstrated. 
Habitat. ‘Vhe plant is properly a litoral alga, living principally in rock-pools 
within the lower part of the litoral zone. However it descends also into the sublitoral 
zone and is met with even at such a considerable depth as LO—15 fathoms. It flou- 
rishes in exposed as well as in sheltered localities and is gregarious, although in the 
north it does not occur in any very great masses at the same place. I know only 
sterile specimens from the Polar Sea. 
Geogr. Distrib. This species occurs with certainty in the Atlantic as well as 
the arctic region of the Polar Sea, although there are wide reaches of the latter, where 
it seems to be replaced by other species. Its maximum of frequences lies probably 
within the Atlantic region. The question of how far it goes northwards in Baffin Bay, 
is not yet cleared up. The northermost place where it is known with certainty to grow, 
is Gjesveer, about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: common and pretty plentiful both in the 
south at Nordlanden and in the north within Troms6 amt and Finmarken amt, as at 
the town of Tromsé, at Karlsé, Maasé, Gjesveer, the south coast of Magerdé (ipse), Ingd, 
Honningsvaag and Berlevaag (Fost). 
The Siberian Sea: Pitlekay, scanty, local. 
The American Arctic Sea: Erebus and Terror Bay, Union Bay, Beachey Island, 
Cape Spencer (?). 
Baffin Bay: The west coast of Greenland according to specimens collected by 
Tu. M. Fries; Disco Isle (?). 
Gen. Lithophyllum (Puit.) Rosan. 
Melob. p. 79; Phil. Wiegm. Arch. 1, p. 385; lim. mut. 
Lithophyllum Lenormandi (Arzscu.) Rosan. 
l. ce. p. 85; Melobesia Lenormandi Aresch. in J. G. Ac. Spee. Alg. 2, p. 514. 
Deser. Lithophyllum Lenormandi Rosay. |. c. p. 85. 
Fig. » » » » +, 5, fig. 16 et 17; t. 6 fig. 1, 2, 3 et 5. 
Exsice. Melobesia » » Honenack. Alg. Mar. N:o 296. 
Syn. Lithophyllum Lenormandi Gost, Algenfl. Weiss. Meer. p. 21. 
»  Melobesia Lenormandi Kuren, Nord]. Alg. p. 11. 
