112 L. KoLDERUP Rosenvinge. 



cases I have found in the thicker filaments one intensely red-coloured 

 body in some of the cells, similar to those taken for spores by 

 Batters. I have not submitted this interesting alga to a more de- 

 tailed study and therefore cannot express an opinion on the question 

 of its systematic position; I refer it with doubt to the Bangiacece^. 



Loc. East side of Koldewey Island; entrance to the harbour; at Vestre 

 Havnenæs; off Baadskæret. 



В. Phæophyceæ. 



Fam. Fucaceæ. 



Fucus (L.) Dcne et Thur. 



23. F. inflatus L. 



K. Rosenvinge (1893) p. 834, (1898 I) p. 45; Jonsson (1904) p. 19. 



This species seems to be common in the upper sublittoral region, 



in particular in the harbour where it grows gregariously at a depth 



of 2 to 4 meters, on stony ground, but it occurs also in the littoral 



region (comp. p. 96). It occurs in a form coming near to f. evanes- 



cens. The frond is up to 12 mm. broad, the midrib well developed, 



the border sometimes feebly undulato-serrate. The receptacles are 



short, seldom over 5 mm. long. The largest specimen is 30 cm. long. 



Inflations filled with air have not been observed. Some plants, 



which have perhaps been loose, approach to f. membranacea. The 



species for the rest only rarely occurs among other loose algæ. 



Found with ripe sex-organs in August and September. 



Loc. East side of Ivoldewey Island; Cape Bismarck; Danmarks Havn; 

 Baadskæret. 



Fam. Laminariaceœ. 

 Alaria Grev. 



24. A. Pylaii (Bory) J. Ag. emend, var. grandifolia (J. Ag.) 

 Jonsson. 



Jonsson (1904) p. 21. 



The Alariæ contained in the collection belong undoubtedly all 

 to the same species. They have all a long stipilal part, the greater 

 part of which belongs to the rachis. It agrees in this and in its 

 large dimensions with A. grandifolia J. Ag. The base of the lamina, 

 however, is often comparatively narrow, cuneate; it may also be 

 rounded ovate, but I have never found it „eximie subcordato-ovata", 



^ In (1909) I have not mentioned this alga under the Bangiacca; as a provisional 

 examination led nie to believe, that Nadson's above-mentioned supposition 

 was right. 



