370 HERRE 



yellowish green or gray. In the field often a dark liver-green , 

 beneath densely villous, buff to dark brown or dingy black ; 

 more or less interspersed with naked white or pale spots. 

 Sterile. 



On trees and rocks. 



Common in the mountains above 1500 feet. Also very 

 abundant on a sandstone cliff in Pilarcitos Creek Canon, two 

 miles from the Pacific Ocean, at an altitude from 200 to 300 

 feet. 



Lichen scrobiciilatus Scopoli, Fl. Carn. 384. 1772. 

 Sticta scrobiciilata Ach. Lich. Univ. 453. 1810. 



XI. Nephromium Ny lander. 



Thallus foliaceous, membranaceous, expanded ; our species 

 of small to medium size; naked, or clothed with a nap beneath, 

 but not veined. 



Apothecia reddish brown, innate on the under side of the 

 more or less extended and narrowed lobes ; usuall}^ exposed to 

 view by the curling of the tips of the lobes ; spores dark, quad- 

 rilocular, subfusiform. 

 Ncfhromium Nylander, Mem. Soc. Cherb. 5 : loi. 1857 (nota) ; 



Nylander, Syn. Meth. Lich. i: 318. i860. 



KEY TO THE SPECIES 



a. Under side of thallus with white tubercles. 



I. to7nentos7iin rarneum^ 3/0' 

 aa. Under side not white tuberculate. 



b. Under side tomentose ; medulla white 2. helvcticjini^ yji. 



bb. Under side smooth ; medulla yellow 3. lusitaiiicmn^ '^'-ji. 



I. NEPHROMIUM TOMENTOSUM RAMEUM Nyl. 



Thallus expanded, membranaceous, medium to large ; lobes 

 rounded, crenate, tomentose at the margin ; becoming elevated 

 and finally imbricate and complicate ; beneath covered with a 

 pale fleecy nap in which are many small white or yellowish 

 tubercles, these larger and more numerous on basal portion of 

 lobes ; color a dusky velvety brown usually, but varying from 

 greenish brown to almost chestnut. Apothecia large, numer- 

 ous, reddish brown. 



