I 86 HERRE 



feet; the white form of dispersed areoles occurs on limestone in the 

 foothills above Los Gatos, at 1000 feet and above. 



The variety contorta (Hoffm.) occurs on shale along the sea 

 coast and occasionally elsewhere. It is distinguished by the green- 

 ish-lead-colored thallus, which is more or less contiguous and thin to 

 moderately thick; fertile areoles enlarged, elevated, irregular, with 

 medium to large, urceolate apothecia. 



Found generally over Europe, North America, and northern 

 Africa. 



XLIV. Ochrolechia Mass. 



Ochrolechia Massalongo, Ric. Aut. Lich. Crost. 30. 1852. 



Thallus uniform crustaceous, areolate, the areolae more or less 

 stipitate below; alga Pleurococcus; surface of thallus often sorediate. 



Apothecia sessile, basally constricted, circular; hypothecium clear; 

 paraphyses branched and entangled; asci 2-8 sporous; spores color- 

 less, large, ellipsoid or ovoid, simple, with thin walls. 



Species few; bark, moss, or rock lichens of the cooler portions of 

 the earth. 



KEY TO THE SPECIES. 



A. On bark; thalline warts red with CaCl 2 2 i. tartar ea 



AA. On mosses and sandstones; CaCl 2 O 2 . 2. upsaliensis 



i. OCHROLECHIA TARTAREA (L.) Mass. 



Lichen tartareus Linne, Sp. PI. 1141. 1753. 



Ochrolechia tartarea Mass. Ricerch. sull' Auton. Lich. Crost. 30. 



1852. 



Lecanora tartarea Tuck. Syn. N. Am. Lich. I: 196. 1882, in part. 

 Lecanora pallescens Tuck. Syn. N. Am. Lich. I: 196. 1882, in part. 



Thallus orbiculate to effuse, thick, (rarely thin), from smooth 

 becoming rough, crumbly, granulose and chinky, or of crowded, 

 unequal, finger-like warts; color whitish or grayish white; KOH yel- 

 low or yellowish; tops of thalline warts red with CaCl 2 O 2 . 



Apothecia soon large, from concave becoming plane, finally 

 crowded, or heaped and contorted, the disk wrinkled more or less, 

 and becoming wavy; not rarely when very large they are convex and 



