THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 185 



surface smooth, from flattish becoming tumid and irregular; color 

 light to dark bluish-gray or ashen; KOH ; CaCl 2 2 ; medulla 

 I-. 



Apothecia small, usually one, sometimes two or three in an areole; 

 immersed, concave, finally protruded and sessile, the disk then plane; 

 black, not pruinose; margin persistent, entire, finally flexuous; the- 

 cium pale blue, then greenish blue or reddish violet with I; paraphy- 

 ses sub-conglutinate, their tips dark brownish; asci clavate or ven- 

 tricose, in our specimens their contents usually not differentiated 

 into spores; these when present 6 or 8, sometimes only 4, ellipsoid to 



j2 "2O 



sub-globose, - , In another set of specimens tentatively 

 placed here, with very dark greenish thallus, the spores are 



11 -'3-5 ^ 

 19-5 - 24-5 



A very common rock lichen throughout our range; widely distrib- 

 uted in Europe and probably occurring generally over North 

 America. 



22. LECANORA CALCAREA (L.) Sommerf. 



Lichen calcareus Linne, Sp. PI. 1140. 1753. 



Lecanora calcarea Sommerf. Suppl. Fl. Lapp. 102. 1826. 



Lecanora calcarea Tuck. Syn. N. Am. Lich. I: 199. 1882. 



Thallus determinate or becoming effuse, chinky areolate; the 

 areoles contiguous, angular, appearing uniform to the naked eye, 

 surface more or less rough-crumbly; at the circumference often some- 

 what effigurate; KOH ; CaCl 2 02 ; medulla I . Color from 

 bluish and light gray to pure white; also occurring with the areoles 

 widely scattered, rounded, convex, dull white, densely white prui- 

 nose. 



Apothecia numerous, innate, sunken, finally plane, black, usually 

 whitish pruinose; paraphyses slender, agglutinate; their apices yel- 

 lowish-brownish; hymenium blue with I; asci in our specimens usu- 

 ally without spores; these usually 6, also 2,7, and 8 in number, ellip- 

 soid or globose, - - /* 



/ 



Well developed on limy sandstone in the mountains, above 2000 



