5 GEORGE V. SESSIONAL PAPER No. 39b A. 1915 



XII. 



NOTES ON THE AQUATIC PLANTS OF GEORGIAN BAY. 



By A. B. Klugh, M.A., Queen's University, Kingston. 



• 



During the latter part of August and the first three weeks of September, 

 1912, I was engaged in a study of the Hydrophytes of Georgian Bay in con- 

 nection with the Biological Station at Go Home Bay, Muskoka. In company 

 with Mr. A. D. Robertson, M.A,, I made a trip round the Bay, collecting along 

 the shore at numerous points. A full report upon the Algse collected on this 

 trip is given in my paper in " Rhodora.,'' Vol. 15, No. 173 (May, 1913), in which 

 a new species of Rivulana is described, and twelve species of Algse new to Canada 

 are recorded. 



The following are the records of the Pteridophytic and Spermatophytic Hydro- 

 phytes observed on the trip referred to. 



PTERIDOPHYTA. 



Isoeles macrospora. Dur. Growing on muddy bottom in eight feet of water near 

 the mouth of the Shawanaga River Aug. 26. 



Isoetes echinospora hraunii Engelm. Growing submerged near shore in the Shaw- 

 anaga River Aug. 27. Submerged in a foot of water at Killarney Sept. 4. Sub- 

 merged, in Collins' Inlet Sept. 3. 



SPERMATOPHYTA. 



MONOCOTYLEDONEuE. 



Sparganium simplex, Huds. In lake off Shawanaga River, Aug. 27. 



Potamogeton natans, L. Severn River, Aug. 21. At mouth of Shawanaga River, 

 Aug. 27. 



Potamogeton heterophyllus, Schreb. Waubaushene, Aug. 27. In lake off Shawan- 

 aga River, Aug. 27. 



Potamogeton epihydrus cayugensis, Benn. In the French River at foot of the 

 last rapids, Sept. 1. 



Potamogeton lucens, L. At mouth of Shawanaga River, Aug. 26. 



Potamogeton perfoliatus, L. Severn River and covering large areas of water in 

 Georgian Bay at mouth of Severn River, Aug. 21. Near mouth of Shawanaga 

 River, Aug. 26. French River, Sept 1. Killarney, Sept 4. 



Potamogeton zosterifolius, Schw. Near the mouth of the Shawanaga River, 

 Aug. 26. Waubaushene, Aug. 21. 



Potamogeton pusillus tenuissimum, Mortens and Koch. In a very small almost 

 cut-off inlet in one of the Bustard Islands off French River. Aug. 30. 



