12.S 



Family STIGONEMACEAE 

 Genus Hapalosiphon Naegeli 1848. 



2. Hapalosiphon intricatus W. West. 

 W. West in Journ. Bot. XXX. 



This Alga was present in one sample from Vigil-joch. It is 

 not very often reported on from Continental Europe, but I think 

 that many algologists bave not quite realised tbe features of 

 Hapalosiphon intricatus and H. Hibernicus. 



Class FLAGELLATAE — Order Euglenineae 



Family EUGLENACEAE 

 Genus Euglena Ehrenberg 1838. 



3. Euglena sp. 



Tbe cells observed were contracted, and could not be surely 

 determined. 



Class CHLOROPHYCEAE — Order Protococcales 



Family PROTOCOCCACEAE 

 Genus Protococcus Agardh 1824, em. Wille 1913. 



4. Protococcus viridis Agardh. 



Wille in Nyt. Mag. f. Naturvidensk. 1913. 



In great abundance on trunks in the Gilf. Tbe most autbors 

 bave not separated between Protococcus viridis and P. lobatus 

 (Chod.). The later is undoubtedly distinct, and seems perbaps to 

 favour other situations than does P. viridis. It would be inter- 

 esting if the various autbors, contributing to this genus, would 

 realise tbe specific separation. 



Family AUTOSPORACEAE 

 Genus Scenedesmus Meyen 1829. 



5. Scenedesmus obliquus (Turp.) Kuetz. 

 Kuetzing : Syn. Diat. 



This common species was scarce in a couple of samples. 



