1898] Macoun— Cryptogamic Flora of Ottawa. 53 



360. Pertusaria communis, DC. 



On bark ot old trees. On maple trees in Stewart's Bush near the 

 CAR. track, April 12th, i8g8 ; on beech trees in woods one mile 

 south-east of Billings' Bridge ; on old fence rails along the Richmond 

 Road west of Hintonburgh ; on trees in woods west of Hull ; on trees 

 in woods at Leamy's Lake ; on trees and old logs, Aylmer and King's 

 Mountain. 



361. Pertusaria velata, (Turn.) 



On an ash tree in a swamp, Britannia, April 20th, 1895 ; on beech 

 trunks, "Pine Hill," Rockcliffe Park ; on old rails near Aylmer and at 

 the base of King's Mountain ; on butternut trees along the Aylmer 

 Road west of Hull. 



362. Pertusaria leioplaca (Ach.) 



On beech trees in woods at Buckingham, Que., May 14th, 1896. 



363. Pertusaria Wulfenii, DC. 



On beech trees in woods, Rockcliffe Park, April 21st, 1891 ; on 

 the base of beech trees in woods one mile south-east of Billings' Bridge ; 

 on beech trees in woods west of Hull Station ; also on beech trunks 

 near Leamy's Lake. 



XXH. CONOTREMA, Tuckerm. 



364. Conotrema urceolatum, (Ach.) Tuckerm. 



On bark of bitter nut hickory in woods north of the Aylmer Road 

 and west of Hull, Oct. 4th, 1884. 



XXHL GYALECTEA, (Ach.) 



365. Gyalectea lutea, (Dicks.) Tuckerm. 



On the bark of hemlock trees in woods north of Beechwood 

 Cemetery, April 27th, 1892. 



XXIV. THELOTREMA, (Ach.) 



366. Tbelotrema lepadinum, Ach. 



On black ash trees in a swamp west of the entrance to Beechwood 

 Cemetery, Oct. i6th, 1884. 



