98 The Ottawa Naturalist. [August 



pines, along the Ottawa River west of Hull, Que. ; on pines, at King's 

 Mountain, near Chelsea, Que ; on ash trees in a swamp north of Beech- 

 wood Cemetery, April 27th, 1892 ; on trees in a swamp at Stittsville, 

 May 14th, 1897. 



403. Buellia myriocarpa, (DC.) 



On old fence rails ; doubtless common. On stones in fields near 

 Britannia. April 20lh, 1895 ; on old fence rails in McKay's .Woe ds, 

 quite common. April 23rd, 1891 ; on old rails at Siitisville, May 14th, 

 1897 ; also at Buckingham, Que ; on old fence rails near Hinlonburgh, 

 April i8th, 1896. 



404. Buellia papillata, (Sommerf.) Tuck. 



On moss on old fence rails at Carleton Place, Oct. nth, 1889. 



405. Buellia Pertusaricola, Willey. 



On the bark of aspen poplar, but parsitic on Pertusaria communis 

 n woods by the Beaver Meadow near Hull, Que., Oct. i6th, 1889. 



XXXI. GRAPHIS, Ach. 



406. Graphis scripta, (Ach.) 



Very commom on trunks of all kinds in woods around Ottawa. On 

 black cherry, beech, maple and oak bark at Aylmer, May 6th, 1891 ; 

 on butternut, birch and beech at Hull, Que., April 28th, i8gi ; on 

 maple, basswood and ironwood in Beechwood Cemetery, April 26th, 

 1892 ; on balsam fir nt Stittsville, May 14th, 1897 ; on blue beech at 

 Leamy's Lake, Hull, Que. ; also abundant on trees at King's Moun- 

 tain, Chelsea, Que., May 22nd, 1897 ; on alder trunks in Dow's Swamp ■ 

 also in Rideau Park, April 19th, 1897. 



407. Graphis recta, Humb. 



Not uncommon on the bark of yellow and canoe birch in woods. 

 In woods along the Beaver Meadow, Hull, Que., May i6th, 1896 ; also 

 on the same at Buckingham, Que., May 14th, 1896. 



XXXII. OPEGRAPHA, Humboldt. 



408. Opegrapha varia, Pers. 



On butternut baik in woods along the .\ylmer Road west of 11 uP, 

 Que., April 23rd, 1891 ; also on cedar bark at King's Mountain, near 

 Chelsea, Que., May 22nd, 1897 ; on cedar bark in bow's Swamp, May 

 2nd, 1897. 



XXXIII. ARTHONIA, Ach. 



409. Arthonia astroidea, Ach. 



On bark, quite common in woods around Ottawa. On bark of 

 Juglans cinerea in woods along the Aylmer Road west of Hull, Que., 

 April 28th, 1 89 1 ; on Abies balsamea and young j)ines in Dow's Swamp, 

 April 23rd, 1892 : in woods near Aylmer, Que. 



