LICHENS OF SANTA CRUZ PENINSULA 381 



3. LEPTOGIUM CALIFORNICUM Tuck. 



Thallus 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 varnished. Apothecia infrequent, 

 small, red-brown, the paler margin elevated, entire or more or 

 less dentate. 



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. 

 Lcftogiuni californicum Tuck. Syn. N. Am. Lich. i : 159. 



1882. 



4. LEPTOGIUM CALIFORNICUM PLATYNUM Tuck. 



Thallus medium to large, orbicular, or indeterminate through 

 fusion of adjacent plants ; appressed ; lobes irregular, elongate 

 and expanded, imbricate, with crenate or dentate margin ; sur- 

 face finely striate or wrinkled, more or less pustulate, occasion- 

 ally 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 48 x 16 mic, muriform multilocular. 



On earth, roots, and rocks, in damp situations. Abundant 

 on Castle Rock Ridge from 1500 to 3000 feet elevation. As 

 yet not seen elsewhere. 



A very distinct and handsome lichen. 

 Leftogmm californicum ■platymnn Tuck. Syn. N. Am. Lich. 



I : 159. 1882. 



5. LEPTOGIUM PALMATUM (Huds.) Mont. 



Thallus medium to large, more or less tufted, very irregular, 

 deeply laciniate ; lobes more or less convolute, with crenate 

 margin, the 2-4 corniculate tips erect, narrow, tubular, pointed 

 or blunt ; surface of thallus finely wrinkled and pitted ; beneath 

 paler, wrinkled ; color usually reddish brown to chestnut ; 



