THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 183 



18. LECANORA SYMMICTA Ach. 



Lecanora symmicta Ach. Synopsis, 340. 18 14. 



Lecanora varia d. symmicta Tuck. Syn. N. Am. Lich. I: 192. 1882. 



Thallus thin or very thin and scanty, effuse, of minute granules, 

 or forming a minute, rough crust; pale yellow or greenish yellow; 

 KOH yellow; CaCl202 orange or orange-red. 



Apothecia small, at first flat, with thin, entire, or denticulate mar- 

 gin; soon convex, the margin disappearing; often crowded and angu- 

 lose, sometimes heaped, usually obscuring the thallus; color pale yel- 

 low, brownish yellow, or darkening somewhat; paraphyses slender, 

 free, their tips sUghtly enlarged; thecium blue with I; spores ellip- 



5-7^ 

 soid or oblong, «. 



II -13-5 

 Abundant on old fences about the salt marshes and in the valleys 



and foothills; also occurring on bark of trees. Common throughout 



the temperate region. 



Distinguished from Lecanora varia, which it much resembles, by 



the reaction with CaCl202, and by the biatorine apothecia. 



SECTION ASPICILIA (Mass.) Th. Fr. 



Thallus uniform crustaceous, upper cortical layer more or less 

 developed; apothecia permanently innate, the disk deeply concave 

 to plane; paraphyses mostly lax, septate. 



19. LECANORA ALPINA Sommerf. 



Lecanora alpina Sommerfeldt, Suppl. Fl. Lapp. 94. 1826. 

 Lecanora alpina Th. Fries, Lich. Scand. i: 283. 1871. 



Thallus of minute areoles with rough uneven surface, separated by 

 deep, relatively wide fissures; from dark ashy gray merging into 

 cream, or reddish gray at the margin; KOH yellow, then a perma- 

 nent brick-red; CaCl202— ; medulla more or less blue with I. 



Apothecia numerous, small or minute, one or sometimes two or 

 three in an areole; at first innate, with concave disk, soon emergent 

 and plane or even elevated; color jet-black when dry; more or less 

 reddish black when wet; thalline margin entire, at last excluded; the- 



