230 HERRE 



Here described from specimens from San Jacinto Mountain (Dr. 

 Hasse coll.), altitude 7500 feet, and from Mt. Eddy in northern 

 California, collected by Dr. E. B. Copeland, altitude 8500 feet. 



I have collected at Devils Canon, altitude 2300 feet, a sterile 

 lichen which is unmistakably referable here, but which differs from 

 the above in the sub-crustaceous, dwarfed thallus, with much shorter 

 lacineae, more irregularly dispersed and with a rougher surface. 

 The typical form may well occur with us. 



The color variation in this plant is considerable; specimens col- 

 lected by me in the Alps range from dingy orange to bright vermilion. 



Widely distributed in both northern and austral regions. 



3. CALOPLACA MURDRUM (Hoffm.) Th. Fr. 



Lichen murorum Hoffmann, Enum. Lich. 63. 1784. 

 Caloplaca murorum Th. Fries, Lich. Scand. 170. 187 1. 

 Placodium murorum Tuck. Syn. N. Am. Lich. I: 170. 1882. 



Thallus orbicular, closely adherent to the substratum, sometimes 

 forming an effuse crust by the fusing of adjacent plants; centrally 

 areolate or warted, gradually passing into lobes which are pHcate or 

 imbricate, convex or plane, with crenate tips; upper surface more or 

 less minutely granulate scabrous ; usually thickish or swollen, but in 

 a maritime form the lobules are often quite thin; KOH purple; color 

 varying from pale to bright yellow. 



Apothecia medium, convex, plane or sometimes turgid, circular, 

 becoming irregular when crowded; concolorous to dark orange, the 

 disk naked; margin paler, entire to finely crenate; spores 

 4.0 — 8.5 

 10-18 



Common throughout, especially on limestone and calcareous shale. 



This cosmopolitan lichen has a number of well marked forms, of 

 which the following occur with us:- 



4. CALOPLACA MURORUM MINL\TUM (Tuck.) 



Tuck., 1. c. 171. 1882. 



This variety agrees with the type in all respects except that the 

 thallus is a flaming orange-red or dark red. There is every grada- 

 tion in color between it and the type. 



