127 



The climatic conditions are widely different, whereas the 

 separating horizontal distance is very short. 



The following are Usts of the associations in which the Algae 

 occurred. 



1. On trunks of different trees in the Gilf. Ultimo October. 

 I species. 



Protococciis viridis. 



2. In a brook near Castle Goyen Primo November. i species. 

 Cladophora glomerata. 



3. In a horse-troiigìì on S. Vigilio, jjoo feet. Primo Nov- 

 ember. 2 species. 



Oscillatoria, Closterium moniliferum. 



4. In the tarn « Schwarze Lacke » on S. Vigilio. J'J20 feet. 

 On Potamogeton and other plants. Also from the boggy margins. 

 In one collection j^ species. 



Hapalosiphon intricatus , Penium Navicula, Cosmariuni obsole- 

 timi, C. margaritiferum, C. venustum, C. siibtimiidiim, C. impres- 

 siilum, C. subcrenatmn, C. Hammeri, Staurastrnm teliferuni, Zyg- 

 nema, Mougeotia. 



Another collection was essentially of the same composition, 

 Closterium didymotocum was quite predominating, and Desmidium 

 Swartzii, Oocystis solitaria, Staurastrnm punctulatum and Staur. 

 tetracerum were also well represented. 



A third one contained practically the same species, apport- 

 ioned as in the first. 



SYSTEMATIC ACCOUNT 



Class MYXOE»HYCEAE — Order Hormogoneae 



Family O SCILL ATORI ACE AE 



Genus Oscillatoria Vaucher 1803. 



I. Oscillatoria sp. 

 Some very short filaments of an Oscillatoria were observed 

 in the Vigil-joch samples, but none of them were in condition 

 for determination. 



