300 KJELLMAN, THE ALGiE OK THE ARCTIC SEA. 



Habitat. This species is always sublitoral in the Arctic Sea, growing scattered 

 ori exposed coasts, in 4 — 5 fathoins, attached to other algaj or stones. On the northern 

 coast of Norway I have foiind it partly in the upper part of the sublitoral zone near 

 low-water mark, partly at a considerable (10 — 15 fathoms) depth attached to stones, 

 shells or muscles both in exposed and sheltered localities. It is often met with here 

 floating free on the water in large quantities or Avashed ashore. Specimens with zoo- 

 spores have been collected in August on the coast of Spitzbergen. 



Geogr- Distrib. This species has its maximum of frequency in the Norwegian 

 Polar Sea. In the other parts of the Polar Sea it is scarce and little spread. The 

 most northern place where it is known to occur is Fairhaven on the north-west coast 

 of Spitzbergen Lat. N. 79° 49'. 



Localities: The Norwegian Polar Sea: Nordlanden abundant; Finmarken at Maasö, 

 Gjesva^r and Talvik, everywhere abundant and rather common. 



The Greenland Sea: the north-west coast of Spitzbergen, rare. 



The Murman Sea: the coast of Russian Lapland: the west coast of Novaya Zemlya: 

 here only a couple of fragmentary specimens found washed ashore. 

 Tlie White Sea: probably common. 



Baffin Bay : the coast of Greenland according to specimens in the herbarium of 

 the Copenhague Museum; the exact place of occurrence not stated. 



Mono st ro ma crispatum nob. 



M, froiide callo radicali adnato, raembranacea, obovata, obscure viridi nigrescente, margine lacerato et 

 crispo, inferne 170, superne 50 /(. crassa; parte raouostioraatioa e cellulis in sectione frondis transversa luraina 

 qvadrangularia 35 /(. alta, 15 — 35 </. lata pvaebentibus coiitexta. Tab. 28, fig. 11 — 13. 



Description. This species belongs to the same section of the genus Monostroma 

 as M. fascum and M. Blyttii. I have found only three specimens, all of which agree most 

 closely. The largest of them is figured in natural size (tab. 28, fig. 11). It is 4 cm. 

 long and 1,5 cm. broad upwards where its transverse section is greatest. It is obovate 

 in outline as the others. The margin is laciniate and very crisp, the colour is dark 

 green, almost black green, becoming black in drying. Its attachment is a callus radi- 

 calis that is large in proportion to the plant. The stipe is short, but distinct (fig. 11). 

 The greater part of the frond is formed of club-shaped cells with heads that are almost 

 square in transverse section. The heads occupy the one side of the frond, the shafts 

 the other. Upwards the frond is monostromatic, composed of cells square in transverse 

 section, whose breadth is as great as or less than their height. The corners of the 

 cell-rooms are slightl}' rounded. The endochi-ome does not cover the whole wall. The 

 outer wall is comparatively thin. The frond is 50 ti. at the upper margin, the height 

 of the cell-rooms here is 35 ,«., the breadth 15 — 35 ,«. The frond is still more than 

 150 ,«. thick at the middle. The cells as seen from the surface are 4 — 6-angular with 

 thin partition-walls. 



