On the Marine Algæ from North-East Greenland. 95 



næs al a depth oi' 2 lo 4 meters. — 8 to 11 meters, soft bottom 



with Florideæ. 

 Entrance to the harbour (Danrnarks Havn), Sept. 9 — 10*^. Calcareous 



algæ (Lithothamnia and other incrusting algæ). 

 At Vestre Havnenæs, Sept. 4"^ and lO^h 1907. On both sides of the 



reef projecting from the point of land, 28 meters. In 8 to 11 



meters depth Alaria v^ith large sporophylls; no calcareous algæ. 



— One sample from Vestre Havnenæs, Sept. 4*^ 1997 must have 



been collected in the littoral (tidal) region. (Nothing has been 

 noted about the place where it grew.) It contains decidedly 

 littoral alga, such as Calothrix scopulorum, Enteromorpha proli- 

 féra, Pseudendoclonium siibmarinum, Ectocarpiis maritimus {Pili- 

 nia maritima (Kjellm.) Rosenv.) further Rhodochorton and others. 

 Along Vestre Havnenæs and off Baadskæret, Aug. 26^^ 1907. 38 

 meters and deeper, stony bottom with calcareous algæ and shells 

 of bivalves and barnacles. — In lesser depth associations of 

 Delesseria (sinuosa) or Phyllophora iBrodiæi *interrupta). 



— Aug. 28'!^ 1907, 19 lo 47 meters, Florideæ. 

 Stormbugt. Laminarice and Alaria. 



Bay off Vesterdalen, Aug. 28»^ 1907, 4 to 11 meters. 



Cap Amélie, 77°?32' Lat. N., April 22*^ 1907, clumps of algæ frozen 



in the ice. 

 Hyde Fjord, 83° 15' Lat. N., May 15"^ 1907. 4 stipes of a Laminaria 



(probably L. saccharina v. grandis), found lying on the ice in a 



dried state by Capt. Koch. 



As will be seen from the above list, a well developed sublittoral 

 vegetation seems to exist at several places in the explored area. 

 Thus, Fucus inflatus forms a vegetation at a few meters depth under 

 low-water mark. The Laminariaceæ (Laminaria saccharina v. gran- 

 dis, L. solidangula and Alaria Pijlaii v. grandifolia) also form true 

 associations at a somewhat greater depth, while the Florideæ are 

 predominant at other places, mostly in greater depths, in particular 

 Delesseria sinuosa, Turnerella Pennyi, Polysiphonia arctica and Phyl- 

 lophora Brodiœi* interrupta. The brown algæ, except the Laminariaceæ, 

 seem to be less copious; one of the most abundant in the collection 

 is Desmarestia viridis. The incrusting algæ seem to occur rather 

 often abundantly at places where other algæ do not occur, in 

 particular on stony bottom in great depths; the most common of 

 these algæ is Lithothamnion lœve; further may be named Lithoderma 

 fatiscens, Lithothamnion glaciale and fœcundum, Cruoria arctica and 

 Rhododermis elegans. 



Further, it results from the facts related in the list and from 



