122 HERRE 



circular with plane disk, soon wavy, lobate, or difform, sometimes 

 slightly convex; sessile, usually scattered, rarely closely grouped; 

 color a dull black. Proper margin erect, persistent, finally very 

 much flexed or wrinkled; paraphyses rather slender, free, simple, 

 very pale brownish to clear, their tips very dark blackish brown; 

 hypothecium brown or brownish; hymenium dark blue with I; 



spores few, usually 8 in my specimens, ellipsoid, P- 



Abundant on sandstone in the mountains, at an altitude of 2300 

 feet and above. 



Recorded by Tuckerman from Yosemite Valley and from Ukiah, 

 California, and from Colorado; also reported from Kadiak, Alaska, 

 by Professor Cummings, in Lichens of Alaska. 



2. BIATORELLA SIMPLEX (Dav.) Br. et Rostr. 



Lichen simplex, Dav. Trans. Linn. Soc. 2: 283, pi. 28,/. 2. 1794. 

 Biatorella simplex Br. et Rostr. Lichenes Daniae, 115. 1870. 

 Lecanora privigna Tuck. Syn. N. Am. Lich. I: 204. 1882. 



Thallus practically obsolete, or present only as a few scattered 

 crumb-hke particles. 



Apothecia lecideine, minute to small, rarely of medium size, 

 circular, corrugated, folded, or variously shaped; sessile, appressed, 

 scattered or becoming crowded and heaped; disk concave, plane, 

 irregular, dull black or sometimes reddish black; margin rather 

 thick, persistent, elevated, finally flexuose; epithecium dark brown- 

 ish; hypothecium clear; paraphyses very slender, free, simple; 



1.5 — 2.5 

 hymenium blue, then red with I; spores very numerous, 7- //. 



On sandstone in the foothills and mountains. This seems to be 

 quite a variable plant, some of our forms being with difficulty placed 

 here. One, occurring with Biatorella revertens, is strongly marked 

 by its medium sized to large apothecia of a rich red-brown color, 

 with convex and sometimes wavy disk, and small, thin, black margin 



much crenate or lobate, never entirely disappearing; hymenium 



1 



blue to dark blue with I; spores M- 



3-4 



