8 [No. 3.] 



but 2 — 3 jj. partly up to 5, in general about 4 fi, and in all a 

 branch frequently is much thinner than its main axis. I have not 

 seen hairs. The chromatophores seem to be 1 (?) to more in 

 each cell. 



I have seen but a couple of probably not fully developed 

 unilocular sporangia found in specimens collected in March. The}^ 

 are terminate on the secondary branches just breaking through 

 the cortical layer of the host plant, obovate or broadly obovate, 

 9 — 12 p- long and 7 — 10 p. thick. 



This species appear to be most nearly related to Ectocarpus 

 Pringsheimii Rke. (Streblonema fasciculatum Thur.) with re- 

 gard to the vegetative part of the frond, partly, however, also 

 reminding one of endophytic specimens of Ectocarpus (Streblonema) 

 Stilophorae Cr., but the unilocular sporangia reminds oneofthose 

 in Ectocarpus (Streblonema) sphaericus Derb. et Sol. It differs 

 from the latter by its slenderness, more irregular and shorter cells, 

 and above all by its probably even in a fully developed stage 

 much smaller unilocular sporangia. In the other species have not 

 yet been found the last named organs, and it differs also from 

 these by its slenderness and more irregular cells as well as its 

 habitat. 



Trondhjem, April 1896. 



