Fresh Water Algae in Vicinity of Montreal 391 



*FRESH-WATER ALG^E OCCURRING IN THE 

 VICINITY OF THE ISLAND OF MONTREAL. 



By Clare Rothwell Miller, M.A., (Mrs. Hardolph 

 Wasteneys). 



INTRODUCTION. 



In order to secure data in regard to the algal flora of 

 Montreal Island, collections of material were made, dur- 

 ing the autumn of 1911, from pools, ponds and 

 streams in different localities and a number of 

 aquaria containing the algse were maintained in 

 the Botanical Laboratory of McGill University, 

 during the winter. Records were kept of the progress 

 of the different cultures, the forms which had been col- 

 lected were studied and classified, and a number of ex- 

 periments were made with nutrient media. 



The results of these observations are given in 

 the following pages, with as full notes as possible 

 in regard to the habits, associations and 

 relative abundance of the forms described. The 

 importance of such ecological data has been strongly 

 emphasized by Fritsch 1 in his work upon the Algal 

 Flora of the Tropics. The relation of certain of my 

 results to the work of Benecke, 2 Danford, 3 Cope- 

 land, 4 and Fritsch and Rich 6 has been considered. 

 Some observations of rhizoid formation in Spirogyra are 

 given. A systematic list of the various species of the 

 fresh-water algge collected completes the account. The 

 determination of the species in the systematic list has 

 been based on standard taxonomic works and has been 

 corroborated by Professor Derick, under whom the 

 work has been done. I have been greatly aided in these 

 studies by the advice and criticism of Professor Derick, 



*Read before the Natural History Society of Montreal, 

 April 29th, 1912. 



