tNo. 3]. 



Ectocarpus (Strebloneraa) Turnerellae, 



a new Alga. 



By 

 SVI. Foslie. 



E. thailo minutissimo, irregulariter ramoso, cellulis ramorum 

 primariorum 5 — 7 /*, interdum usque ad 10 fi, secundariorum 2 — 5 

 jx crassis, diametre 1 — 3-plo longioribus; zoosporangiis unilocula- 

 ribus statu juniori (?) obovatis, 9 — 12 fi longis, 7 — 10 // crassis, 

 terminalibus. 



In specimens of Turnerella septemtrionalis from the Trond- 

 hjem Fjord and from Korsnes in Nordland I met with the above 

 alga, which without doubt is to be considered as a new species 

 of Ectocarpus (Stréblonema), although the reproductive organs 

 appeared not to be fully developed. 



The species grows endophytic in the named host plant. 

 It is partly much partly but little branched in a more or less 

 irregular manner. The primary as well as partly also the secon- 

 dary branches are extended through the central layer of the host, 

 here and there sending forth undivided branches through the cor- 

 tical layer of the latter, and these branches produce terminate 

 unilocular sporangia. The cells of the primary threads are frequ- 

 ently very irregular in shape and thickness, 4 — 5, mostly 4-angu- 

 late, or the oldest ones sometimes roundish, and often irregularly 

 bent, 1 — 3 times as long as broad, attaining a thickness of up to 

 about 10 /j-, but frequently about 5 — 7 fi. The secondary bran- 

 ches are otfen very thin and less irregular than the former, partly 



