HZ 



Algological notices, 



By 

 M. F o s 1 i e. 



Pelvetia canaliculata (L.) Dene & Thm. f. radicans nob. 



Through the kindness of dr. J. Hagen I got some specimens 

 of a cui -1 ous form of the named Alga, collected by him some 

 years ago at Rindenleret not far from Levanger (in the inner part 

 of the TrondhjemTjord). It grew gregarious in great numbers in 

 shallow pools with clayish bottom and probably brackish water, 

 rather far from the sea but close to a brook called Rindelven, the 

 lower part of the latter being under influence of the tide. It is 

 unknown whether the pools, too, may be under the influence of 

 the tide, but the surrounding ground is at any rate saltish. 



The plant is 2 — 2.5 cm. high, forming extensive and rather 

 interwoven, fastigiate patches. In ramification it coincides with the 

 typical form of the species, but the lower part of the frond is 

 somewhat creeping, provided with more or less numerous rhizoids 

 connecting the particular individuals to one another, and penetrating 

 about 1 cm. into the clay. The branches are sometimes roundish, 

 sometimes and more commonly a little compressed, 0.5—1 mm. 

 broad and 0.3—0.5 mm. thick. The margins are partly bent a little 

 inwards but not distinctly canaliculated as in the typical form. 



The specimens were steril when collected in the beginning 

 of May. 



The typical form of Pelvetia canaliculata is common and 

 abundant at Trondhjem, but I do not know as yet whether it is 

 found as far as the inner part of the fjord. 



v *V 1 MM 



