l6o HERRE 



dusky velvety brown usually, but varying from greenish brown to 

 almost chestnut. 

 Apothecia large, numerous, reddish brown; spores pale brown to 



colorless, broadly spindle-shaped or oblong, 4-locular,--^ //. 



17 — 22 



On trees and shrubs, most frequent on Rhus diversiloba. Appar- 

 ently confined to damp undergrowth in oak woods about the summit 

 of the range. Abundant on Black Mountain, Page Mill road, at 

 2000 feet. 



A lichen of arctic and temperate Europe and America. 



2. NEPHROMA HELVETICA Ach. 



Nephroma helvetica Acharius, Lich. Univ. 523. 1810. 

 Nephroma heheticum Tuck. Syn. N. Am. Lich. I: 104. 1882. 

 Nephroma heheticum Herre, Proc. Wash. Acad. Sci. 7: 371. 1906. 



Thallus small or medium, expanded, intricately and sinuously 

 complicate-lobed; lobes rounded, more or less crisped, their margins 

 crenate, typically fringed with small or minute tooth-like lobules; 

 surface smooth or minutely granular, but occasionally sprinkled 

 with pustules or lobulate outgrowths, and sometimes deeply pitted; 

 medullary layer white, KOH— ; beneath pale brown to dusky, 

 covered with a dense concolorous nap; thallus brown, of varying 

 shades. 



Apothecia abundant, very dark red; spores 4-locular, faint 



r Or 



brown, ellipsoidal to spindle-shaped, ~ ^ ,«. 



17 - 23 



On trees and shrubs in the mountains, above 1700 feet. Appar- 

 ently confined to dense damp woods near the summit of the range; 

 widely distributed but not very abundant in any one locality. Gen- 

 erally distributed over North America and the mountains of Central 

 Europe. 



3. NEPHROMA LUSITANICUM Schaer. 



Nephroma lusitanicum Schaerer, Enum. Crit. Lich. Europ. 323. 



1850. 

 Nephromium lusitanicum Tuck. Syn. N. Am. Lich. I: 105. 1882. 



