Contribution. I. 23 



Descr. Fucus sinuosus y quercifolius Turn, 1. c. 



Exsicc. Delesseria sinuosa Aresch. Alg. Scand. exsicc. No. 74. 



f. lingulata Ag. 

 Spec. Alg. 1, p. 175. 

 Descr. Delesseria sinuosa y lingulata Ag. I. c. 

 Fig. Phycodrys sinuosa Kiitz. Tab. Hive. 16, t. 20, fig. e— f. 

 Syn. Fucus roseus Fl. Dan. t. 652. 



„ sinuosus Wg. Fl. Lapp. p. 491. 



This is properly a pelagic species, and appears along 

 the unsheltered coast almost ever in the typical form, or 

 forms which are most nearly related to this. But it also 

 enters into the bays or occurs on sheltered places, yet here 

 it does not develop to the same luxuriancy as on open shore 

 and assumes more or less differing forms. It is at least on 

 such places the most extreme forms are observed. Thus f. 

 lingulata is only to be met with in more or less sheltered 

 localities, or on a greater depth, and generally on looser 

 bottom than the other forms. Of the form quercifolia I have 

 only seen a couple of specimens at East-Finmarken, or pro- 

 perly a transition between this form and f. typica, but most 

 likely to be reckoned to the former. 



The present species is litoral, sublitoral as well as eli- 

 toral. Within the litoral region it is not often met with, 

 and only in rock-pools, generally attached to Laminaria-r oots. 

 The sublitoral zone is its proper native place. On open shore 

 and rocky bottom, on a depth of 5 — 15 fathoms the best de- 

 veloped and most luxuriant individuals are collected, attai- 

 ning a length of 40 cm. Large and well developed speci- 

 mens are also to be found growing on the stems and root 

 of Laminaria hyperhorea. I only know little of its occurrence 

 in the elitoral zone, as I have here only two times met with 

 a few living but somewhat stunted individuals, on a depth 

 of about 25 fathoms. Yet this has been on loose and clayish 

 bottom where the plant seldom thrives, and on such locali- 



