1906] The Cryptogamic Flora of Ottawa. 183 



467. Parmelia cetrata, Ach. 



On an elm trunk in a swamp at Carleton Place. May 12, 

 1900. 



468. Physcia tribacia, (Ach.) Tuckerm. 



On black ash trees along Lake Duchesne above Britannia- 

 Oct. 27, 1900. 



469. Physcia obscura var. endochrysea, Nyl. 



On black ash trees south of Cowley Farm. April 18, 

 1895, 



470. Leptogium myochroum, Ehrh. Tuckerm. 



On rocks, McKay's woods, April 16, 1891, and on King's 

 Mountain. May 22, 1897. 



471. Placodium cerinum var. pyracea, Nyl. 



On old cedar trunks in Dow swamp. May 2, 1896. 



472. Placodium vitellinum var. octosporum, Nyl. 



On rocks near Hogsback, four miles from Ottawa, May 

 2, 1896 ; on bark of cedar rails south of Beechwood Cemetery. 

 April 14, 1897. 



473. Lecanora subfusca, var, distans, Ach. 



On bark of beech trees, McKay's woods, Ottawa. April 

 16, 1 89 1. 



474. Lecanora subfusca var. minor, Branth. 



On limestone rocks near the Hogsback, four miles from 

 Ottawa. May 2, 1896. 



475. Lecanora varia var. polytropa, Nyl. 



On limestone rocks, Blueberry Point, Aylmer, Que. 

 April 25, 1900. 



476. Lecanora cenisia, Ach. 



On limestone rocks, along the Rideau River, near Hogs- 

 back, four miles from Ottawa. May 2, 1897. 



477. Lecanora cinerea, (Linn.) Sommerf. 



On limestone rocks, alon^f the Rideau River, near the 

 Hogsback. May 2, 1897. 



