34 



particles ol' inorganic as well as of organic materials. A bottoni like this is a 

 nntritive and good place ior tlie piants and liere also \ve find a luxurious vegeta- 

 tion. On the larger stones we find Fucus vesiculosns and CJiorda filnm in shallow 

 water, Fucus serratus, Laminnria saccharina and digifata and Halidrys siliqnosa in 

 somewhat deeper water. The 

 smaller algæ, chiefly the red 

 and brown algæ, ot'ten appear 

 as a thick carpet cousisting 

 mainly of Furcellaria fastigiata, 

 species of Folysiplionia, Cysto- 

 doniiim, species of Phyllophora 

 and Ehodomela of the red algæ, 

 and of the brown algæ: spe- 

 cies of Edocarpus, Fylaiella 

 and Desmarestia viridis. In 

 the thick undergrowth of all 

 these smaller piants we find 

 more or less scattered growths 

 of the eel-grass. Such mixed 

 vegetation is common in the 

 Little Belt, the Great Belt and 

 the Sound as well as in the 

 western parts of the Lim Fjord. 

 It requires for its growth oft- 

 renewed, somewhat salt water, 

 a necessity for most of the red 

 algæ. To distinguish it from 

 the other kinds of »mixed« 

 vegetation it may suitably be 

 called Red-Alga Zostera 

 Vegetation. 



Coucerning the auimal 

 lii'e which is connected with 

 this kind of vegetation, I have 

 unfortunately but little infor- 

 mation; it consists partly of 

 the above-mentioned animals, 



partly of others which are more closely connected with tlie algæ than with the 

 Zostera and which follow the algæ out to slightly greater depths. In Rei)ort III 

 of the Biological Station, p. 29, a general summary is given of the animals which 

 occur in Fænø Sound on »alga-ground«, and it is almost the same as in the case 

 of the Red-Alga Zostera Vegetation. The auimal life is liere upon the whole rich 

 and varied. 



The other kind of mixed Zostera vegetation may be called the Green- 

 Alga Zostera Vegetation or with a more comprehensive term the Brackish- 

 Water Zostera Vegetation; it appears namely m the least saliue of our waters, 



Fig. 0. Floweriug shoot of a very long and broad-leaved Mud-Zostera 

 At b and several other piaces we see clumps of small mussels ; at m 

 eolonies of Membranlpora. 

 (Soft bottora; oft the east side of Livø, Lim Fjord, 2 fm.) 



