144 HEKRE 



9. LEPTOGIUM CALIFORNICUM Tuck. 



Leptogium californicum Tuck. Syn. N. Am. Lich. I: 159. 1882. 

 Leptogium californicum Herre, Proc. Wash. Acad. Sci. 7 : 38 1 . 1 906. 



Thallus of medium size, indeterminate, irregularly and narrowly 

 laciniate and cut-lobed; the margins erect, crinkled or much and 

 intricately folded, more or less crenate, serrate, or dentate-lobulate, 

 or sometimes merely granulate. Thallus occasionally much reduced, 

 the erect, very narrow, much dissected lobes then densely crowded; 

 color black or dark brown; margin often lustrous as if oiled or var- 

 nished. 



Apothecia infrequent, small, red-brown, the paler margin elevated, 

 entire or more or less dentate; spores muriform-multilocular, rarely 



ii 16 



only 6 8 locular, /* 



29-48 



Occurring throughout, forming large, coal-black mats on mossy 

 sandstone ledges at moderate elevations in the foothills; reduced 

 forms occurring in rock crevices as low as 150 feet. Found from 

 British Columbia to Lower California. 



10. LEPTOGIUM PLATYNUM (Tuck.) Herre. 



Leptogium californicum platynum Tuck. Syn. N. Am. Lich. I: 159. 



1882. 

 Leptogium californicum platynum Herre, Proc. Wash. Acad. Sci. 7: 



381. 1906. 



Thallus medium to large, orbicular, or indeterminate through 

 fusion of adjacent plants; appressed; lobes irregular, elongate and 

 expanded, imbricate, with crenate or dentate margin; surface finely 

 striate or wrinkled, more or less pustulate, occasionally minutely 

 lobulate; beneath paler, finely wrinkled; color black or greenish 

 black, rarely brownish black. 



Apothecia very numerous, minute, reddish brown, the prominent 

 entire margin paler; spores ovoid or ellipsoid with attenuate tips, 



.- 10 16 



munform, multilocular, /*. 



27 - 48 



On earth,exposed roots, and rocks,in damp situations in the moun- 

 tains. Abundant on Castle Rock Ridge from 1500 feet upwards. 



