178 HERRE 



Common on rocks throughout and widely distributed over Europe 

 and North America, 



TO. LECANORA ATRYNEA CENISIA (Ach.) Nyl. 



Lecanora cenisia Ach. Lich. Univ. 361. 1810. 

 Lecanora cenisia Tuck. Syn. N. Am. Lich. I: 186. 1882. 

 Lecanora atrynea cenisia Nyl. ex Lamy, Bull. Soc. Bot. Fr. 409. pi. 

 25. 1878. 



Thallus of coarse crumb-like or warty granules, usually scattered, 

 or forming a warty, areola te crust; from determinate spreading 

 extensively and becoming indeterminate; color varying from gray to 

 white ; KOH yellow ; CaClaOj - . 



Apothecia usually numerous, medium to large, plane to convex, 

 sometimes contorted from crowding; livid, yellowish brown, and 

 blackish, the color concealed by an ashy bloom so that the apothecia 

 appear nearly concolorous with the thallus ; the thick margin crenate, 

 persistent; epithecium brownish, granulose; thecium blue with I; 



11- -J 7 — 10 



spores elhpsoid, — ^ ,«. 



10-17 



A rather variable lichen, abundant on rocks and occasional on 

 earth along the ocean shore, occurring also on various rocks on Mt. 

 San Bruno, at 1000 feet and above. 



I also refer here a lichen from the San Bruno Hills in which the 

 thallus is composed of closely aggregated papillate warts, with large 

 and naked apothecia. 



Distributed over Europe and North America, in maritime and 

 alpine regions. 



II. LECANORA SUBFUSCA (L.) Ach. 



Lichen subfuscus Linne, Fl. Suec. 409. 1755. 

 Lecanora subfusca Ach. Lich. Univ. 393. 18 10. 

 Lecanora subfusca Tuck. Syn. N. Am. Lich. I: 187. 1882, (in 

 part.) 



Thallus from orbiculate and determinate becoming eflfuse and 

 widespread, smoothish and thin to uneven, wrinkled, chinky, or 

 rough granulose; color whitish, grayish white, or ashy gray; KOH 

 yellow; CaClzOa-. 



