96 The Ottawa Naturalist. [Sept. 



Scytonema crispum, Borne! . Rock pool, rocky point, shore of 



Lake Huron at Oliphant, June 14. 

 Scytonema mirabile, Bornet. Sky Lake, near Oliphant, May 28. 

 Scytonema myochrous, Agardh. Bog, Oliphant, May 28. 

 Tolypothrix lanata, Wartmann. Sky Lake, near Oliphant, May 



28. 

 Stigonema mamillosun, Agardh. Bog, Mud Lake, near Colpoy's 



Bay, June 7. 

 Calothrix parietina, Thuret. Damp place on limestone rock, 



Colpoy's Bay, May 11. 



Chlorophyceae. 

 Ophiocytium cochleare, A. Braun. Swale, Colpoy's Bay,. May 20; 

 Swamp, Golden Valley, June 1; Swamp near Boat Lake, 

 June 16; Ditch, Oliphant, June 14. 

 Ophiocytium parvulum, A. Braun. Swale, Colpoy's Bay, May 20; 

 Swamp, Golden Valley, June 1; Bog, Mud Lake, June 7; 

 Swamp, near Boat Lake. June 10; Ditch, Oliphant, June 14; 

 Pool, Hope Bay, June 8. 

 Ophiocytium gracilipes, Rab. Scarce, in a collection from a 



marsh on the Cape Croker road, May. 30. 

 Conferva bombycina, Agardh. Swamp, Golden Valley, June 1; 

 Swamp, Mar road, June 5. Ditch, near Boat Lake, June 

 16; Stream in sandy shore, Oliphant, June 14. 

 Zygnema leiospermum, De Bary. Common near mill at Lake 



Isaac, June 5. 

 Spirogyra catenae for mis, Kuetzing. Bog, Mud Lake, June 26. 

 Spirogyra various, Kuetzing. Common, with abundant zygos- 

 pores, in ditch near Wiarton, May 5. By May 26 it had 

 completely disappeared though the ditch still contained 

 plentv of waier. Scarce in a swamp near Boat Lake, 

 June 16, zygospores present. 

 Spirogyra orthospira, Naegeli. Small stream from spring, Oli- 

 phant, June 14, in all stages of conjugation; Ditch, Colpoy's 

 Bay, June 23. 

 Spirogyra weberi, Kuetzing. Common in pools in sand of shore 

 of Lake Huron at Golden Valley, in all stages of conjugation, 

 June 1; Ditch, Lion's Head, June 8, just beginning con- 

 jugation; in small stream in sandy shore at Oliphant, 

 June 14, spores mature; Swamp, Adamsville, June 8. 

 Spirogyra insignis, Kuetzing. Ditch, near Wiarton. June 4, 



spores nearly mature. 

 Mougeotia genuflexa, Agardh. Common in a small marsh near 

 Purple Valley, May 30, very sparingly fruited; Swamp, 

 Golden Valley, June 1. 



