178 GEOLOGICAL SURVEY OF CANADA. 



Hogsback, south of Ottawa, Ont., April 30th, 1897 ; along the 

 Beaver Meadow, Hull, Que. {Macoun.') 



594. P. gemmata, (Ach.) N^g. & Hepp. 



On bark of trees along the Gaspe Coast, Que.; on maple trunks 

 at Ottawa, Ont.; on trunks at Belleville and Central Ontario 

 Junction, Hastings Co., Ont. (Macoun.) On bark, Rigaud Moun- 

 tain, Vaudreuil Co., Que. {Rev. G. Ducharme.) 



595. P. cinerella, (Flot.) Tuckerm. 



On maple and black ash bark at Ottawa, Ont., April 19th, 

 1898. {Macoun.) 



596. P. hyalospora, (Nyl.) Tuckerm. 



On bark of trees, London, Canada. {A. T. Drummo7id.) On bark 

 of trees at Belleville, Hastings Co., Ont. {Macoun.) 



597. P. patellarseformis, Eckfeldt. 



On young black ash. Billing's bush, Rideau Park, Ottawa, Ont., 

 April 19th, 1897. {Macoun.) 



598. P. leucoplaca, (Wallr.) Kcerb. 



On bark of black ash at Belleville and of maples at Central 

 Ontario Junction, Hastings Co., Ont.; on maple bark in woods 

 near Hull, Que., May Sth, 1897. ^Macoun.) 



599. p, pithyophila, Th. Fr. 



On blue beech bark, Central Ontario Junction, Hastings Co., 

 Ont., Oct. 24th, 1893. {Macoun.) 



600. P. mamillana, (Ach.) Tuckerm. 



On bark of trees at Carleton Place, near Ottawa, Ont.; also on 

 trees at Shannonville, Hastings Co., Ont. {Macoun.) 



601. P. fallacia, Eckfeldt. 



On young maple trees at Chelsea, Que.. May 15th, 1894. 

 {Macoun.) 



602. P, nitida, Ach. 



On bark, Rigaud Mountain, Vaudreuil Co., Que. {Rev. G. 

 Ducharme.) Quite common on trunks, of beech trees at Ottawa 



