1 86 The Ottawa Naturalist. [December 



499. Buellia PETR/EA (Flot.) Tuckerm. 



On granite boulders near Governor's Bay, Rockcliffe 

 Park, Ottawa, April 17, 1895. 



500. Buellia obscurata, (Ach.) 



Quite common on limestone and other rocks around 

 Ottawa ; also at Blueberry Point, Aylmer, Que. April 25, 

 1900. 



501. Opegrapha vulgata, Ach. 



On ash bark near the Rideau River, at the Hogsback ; 

 also at Leamy Lake, Hull, Que. May 7, 1897. 



502. Graphis scripta, var. serpentina, Ach. 



On bark of Juglans cinerea in woods west of Hull, Que., 

 April 24th, 1897. 



503. Calicium pusillum, Flcerke. 



On old rails along the road leading from Aylmer to 

 Kingsmere, Que. May 22, 1897. 



504. Sagedia Cestrensis tuckerm. 



On the bark of young maples at Ottawa ; also on Kings' 

 Mountain above Chelsea, Que. May 22, 1897. 



505. Verrucaria rupestris, Schrad. 



On limestone rocks on the cliffs along the Ottawa, Rock- 

 cliffe Park, Nov. 11, 1896. 



506 Verrucaria epidermidis forma punctiformis, Branth. 



On living alder stems along the Rideau River, near 

 Hogsback, April 30, 1897. 



507. Pyrenula patellaR/EFOrmis, Eckfeldt. 



On the bark of living black ash in Billings Bush, April 

 19, 1897. 



508. Pyrenula leucoplaca (Wallr. ) 



On bark of young maples in woods near Hull, Que., 

 May 5, 1897. 



509. Pycnides versimilide, Branth. 



On black ash bark in Billings Bush, April 19, 1897. 



