A CONTRIBUTION 
TO OUR 
knowledge of the Treshwater Algæ of Columbia 
B Y 
G. S. West, M. A., D. Sc., F. L. S., 
Professor of Botany in the University of Birmingham. 
Allhough we liave a considérable general knowledge of (lie Alga-flora of the fresh- 
waters of South America, nothinghas been previously published on the freshwater Algæ of 
Columbia. The collections made by Dr. Mayor in bis Scientific Expédition of 1910 lo 
the Columbian Andes liave therefore proved of great interest. There were in ail twenty- 
four tubes of algal material collected al altitudes varying front i 55 o to 36 oo métrés. 
Tliey were as follows : 
N os 1 and 2. Laguna above Medellin, Department Antioquia, Central Andes. Altit. 
23 oo m. 
N os 3 and 4 - Laguna above Estrella near Medellin, Dep. Antioquia, Central Andes. 
Altit. 2 5 oo m. 
N° 5 . Bog near the Laguna above Medellin, Dep. Antioquia, Central Andes. Altit. 
23 oo m. 
N" 6. Ditches between Medellin and America, Dep. Antioquia, Central Andes. Altit. 
i 55 o m. 
N° 7. Ditch above America and near Medellin, Dep. Antioquia, Central Andes. 
Altit. i 85 o m. 
N 0s 8 and 9. Pool upon the Alto Don Elias near Angelopolis, Dep. Antioquia, 
Central Andes. Altit. 2100 m. 
N° 10. Pool on the last slope of the Alto Don Elias near Angelopolis, Dep. Antio- 
quia, Central Andes. Altit. 2100 m. 
N os 11 and 12. Laguna Santa Rita near Angelopolis, Dep. Antioquia, Central Andes, 
Altit. 1600 m. 
