409 



The main branches are often surrounded at their base by long 

 rhizoids which, however, only produce a very scanty cortical layer. 



This species appears to come aear to the group of forms belonging 



to Ectocarpus siliculosus, more parlicuiarly its f. arcta ; but it is as yet 



so little known that for the present I prefer to call it Ectocarpus spec. 



Found hitherto only on Str. : Sundene between Thorsvig and 

 Kvalvig (!). 



87. E. dasycarpus Kuck. , Beitråge zur Kenntnis einiger Ecto- 

 carpus- Arten der Kieler Fohrde, p. 21. 



The specimens referred to this species agree altogether well 

 with Kuckuck's description and figure, differing in some minor 

 points only. Thus the cells in the main branches, which are about 

 40 /x broad, are generally only as long as broad, sometimes even 

 shorter, and the plurilocular sporangia are sometimes a little broader 

 than recorded by Kuckuck, viz. about 21 \i. 



It has been found in the sublittoral zone, growing epiphytic 

 on Desmarestia aculeata at a depth of some 5—6 fathoms in a 

 sheltered situation. It bore plurilocular sporangia in the middle 

 of May. 



Found only on Ost.: Ore (!). 



88. E. fasciculatus (Grifl) Harv. Kjellm., N. I., p. 344 (279), 

 Handb., p. 76 ; Sauvageau, Sur quelques Algues phéosporées parasites 

 (Journal de Botanique 1892, p. 102). 



Besides typical specimens, several others were found which I 

 have referred, though doubtfully, to this species, amongst others 

 some which I have referred to var. refracta (Kutz.) Ardissone. In 

 fig. 70 I have shown some fragments of them. The specimens in 

 question were marked by their sharply recurved, almost hook- 

 shaped lateral branches, which occurred scattered upwards along 

 the main filaments, and bore on their upper side short-stalked 

 sporangia which agreed altogether well with Sauvageau's figures, 

 1. c. ; and, as in Sauvageau's fig. 34, the lateral branches terminated 

 in a sterile part destitute of sporangia-bearing branchlets, and not 

 in a hair-like apex such as frequently occurs in typical Ectocarpus 

 fasciculatus. The cells in the thicker filaments of this variety were 

 about 4 \i thick, and had elegant, spirally twisted chromatophores 

 which were often ramified. 1 



1 An imperfectly known species. Eet. Constanciæ Hariot, seems to resemble 

 it fairly closely (Forschungsreise S. M. S. »Gazelle«, IV. Theil, Botanik, Algen von 

 E. Askenasy, p. 17). 



