257 



321. Nitella opaca Ag. 



Foiind in Leinumvatn (Str."); Norbes Ejde and Kvanhauge (Syd.); 

 Grothusvatn (San do); and by Rostrup on San do; and Hesto. 



III. Phæophyceæ. 



Order XXV. HYDRURACEÆ. 



322. Hydrurus fætidus (Vill.) Kirchn. 



Found by Lyngbye; in Hydrophyt. p. 203 he calls it Palmella 

 Mgosurus and gives an excellent description of it. Willi regard to 

 its habitat Lyngbye writes: »Habitat in rivulo alpino leniter fluente 

 ad rnpem Slatteratind prope Eide Osteroe Færoæ saxis adnata, 

 copiosissime«. 



IV. mLodophyceæ. 



Order XXVI. HELMINTHOCLADIACEÆ. 



323. Chantransia Hermann! (Roth.). 



In 1896 I found in a small stream near Molen at Ejde (Ost.) 

 Fontinalis quite covered with a small Chantransia-like plant which 

 I relying on Kirchner's description in Alg. Schles. p. 46 and on 

 Kiitzing's figure (Tab. phycol. V, tab. 43) feel justified in referring to 

 the above-named species. 



The cells in the apices of the main filaments as well as in 

 the apices of the nearly straight stiffly erect lateral branches often 

 terminale in a rather long colourless hair. 



As is well-known the greater part of the Chantransia-si^ecies 

 must be regarded as more or less highly developed stages of Ba- 

 trachospermnm, Lemanea, Thorea, etc. (cfr. F. Brand: Ueber Chan- 

 transia ^) and we might therefore expect to find some of these genera 

 in the Færoes. Accordingly I was very much interested in finding 

 a small fragment of a Batrachospermum sp. in Plankton from Sor- 

 vaagsvatn. 



The fragment which I found corresponds very closely to one 

 of the lateral branches in Cooke's figure (Brit. Freshw. Algæ pi. 122) 

 of B. moniliferum Roth. var. proliferum Carm. 



This paper was finished in December 1898. 



1 Hedwigia 1897, vol. XXXVI. p. 300. 



Botany of the Færoes 17 



