760 



Near Gliversnæs, at a depth of about 10 — ISfathoms, on a bot- 

 tom of pebbles and shells, a vegetation was found consisting of the 

 following algæ: AntUhamnion Plumnla, Polijides rotiindus, Porphyra 

 miniata, Phyllophora Brodiæi, Callophyllis laciniata, Ulva Lactuca, 

 Ectocarpus Hincksiæ, Desmarestia viridis, Laminaria saccharina, and 

 Ibe following crust-like algæ: Lithoderma fatiscens, Peyssonnelia Dii- 

 byi, and less abundantly, Lithothamnion læve and Phymatolithon lævi- 

 gatiim. The calcareons shells found among the pebbles had heie, as 

 everywhere in the subliltoral region, a green or reddish hue from 

 the Conchocelis rosea, Gomonlia polyrhiza, Ostreobiiim Qiieketti and 

 Hyella. At Hvidenæs, at a depth of about 10 fathoms, a similar 

 vegetation was found; yet the following algæ: Odonthalia dentata, 

 Delesseria simiosa, Derbesia marina, Polysiphonia Brodiæi and P. elon- 

 gata occurred in addition to the majority of the above-mentioned 

 algæ from Gliversnæs. This vegetation seems to correspond with 

 Kjellman's and Rosenvinge's descriptions except for some flori- 

 stical differences. The characteristic alga is however not so com- 

 mon on the coasts of the Færoes as in Greenland and in the 

 »Murman Sea«. 



In connection with this, we must also point out that the Færoes 

 seem to be perfectly destitute of the Lithothamnion-formation else- 

 where very common in the northern seas. With the exception 

 of Phymatolithon polymorpham, which is very common on rocks 

 from the lowest water mark downward into the sublittoral re- 

 gion, the Lithothamnion-species are relatively few on the Færoes. 

 The specimens found there are, according to what Mr. Foslie 

 kindly tells me, often stunted and badly developed. Most likely 

 the reason is, that the bottom is in deep water most often of 

 sand or mud, and therefore not suitable to the requirements of 

 these algæ. 



Si m mons, who once dredged with me at Gliversnæs, gives a 

 description of some of the algæ from that place (p. 257) yet with- 

 out drawing any final conclusion as to the character of this vege- 

 tation. 



The snbUttoral Florideæ-For mation. 



The brown algæ which grow deepest e. g. Laminaria hyper- 

 borea and Desmarestia acnleata, already become scarce at 15 fa- 

 thoms, and most likely disappear at 20 fathoms. At this depth 

 hardly anything but Florideæ are found. At the curve of 20 fathoms 



