98 The Ottawa Naturalist. [Sept. 



Coelastrum proboscideum, Bohlin. Swale, near Colpoy's Bay, 

 June 5; Marsh, Oliphant, June 14. 



Sorastrum spinulosum, Naegeli. Scarce, in collection from a pool 

 at Hope Bay, June 8. 



Hydrodictyon reticulatum, Lagerheim. Forming a sheet over 

 the surface of a large pool at edge of swale near Colpoy's 

 Bay, June 5. 



Pediastrum boryanum, Meneghini. A very common plankton 

 . form throughout the Peninsula. 



Pediastrum tetras, Ralfs. Scarce, in collection from a marsh at 

 Oliphant, June 14; Pool, Hope Bay, June 8. 



Ulothrix aequalis, Kuetzing. This species and Ulothrix zonata 

 are the commonest filamentous forms on the rocks of the 

 shores of Georgian Bay. They occur in patches consisting 

 of one species only. Gametes were mature on April 30. 



Ulothrix zonata, Kuetzing. Common on rocks along shores of 

 Georgian Bay; fruiting on May 7. 



Oedogonium capilliforme, Kuetzing. Swale, Colpoy's Bay, June 5. 



Chaetosphaeridium globosum, Klebahn. On Oedogonium capil- 

 liforme in swale, Colpoy's Bay, June 5. 



Chaetophora elegans, Agardh. Forming globular gelatinous 

 masses about 5mm. daimeter on stones in a pool on the 

 Cape Croker road, May 30; forming light green spheres from 

 extremely minute size up to 1 mm. diameter on sticks at 

 edge of a willow swale near Colpoy's Bay, June S. 



Chaetophora incrassata, Hazen. Attached to log in a ditch, near 

 Wiarton, May 12; common on stones at bridge over Pata- 

 nelly River, near Mar, June 1. 



Stigeoclonium lubricum, Kuetzing. Common in a little stream 

 from a spring near Wiarton, May 5. 



Draparnaldia acuta, Kuetzing. In pools with Tetraspora lubrica 

 on a bush road near Mar, May 10, Stream near Wiarton, 

 May 19; Stream near Golden Valley, June 1. 



Draparnaldia glomerata, Agardh. Swale, Colpoy's Bay, May 20; 

 Swamp, Golden Valley, June 1. 



Pleurococcus vularis, Meneghini. Common on trees, walls, etc. 



Tretepohlia aurea, Martius. Scarce on limestone rocks in Pop- 

 ulus-Thuja scrub along Mar road, June 20; forming bright 

 orange velvety cushions from 1 to 2 dm. in extent ; Forming 

 light orange-colored patches on rocks along the shore road 

 at Colpoy's Bay, June 25. 



Cladophora callicoma, Kuetzing. Scarce in stream at Colpoy's 

 Bay. 



Voucher ia sessilis, D.C. Common in swale along Wiarton road, 

 oospores not yet mature, June 23. 



. Voucher ia geminata racemosa, Walz. Swamp near Boat Lake, 

 June 15. 



