THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA l8l 



On bark of trees and old fences in the foothills and mountains; 

 most abundant on JEsculus calif ornicus , associated with Caloplaca 

 cerina. On leaves of Yucca sp., at Stanford University, with Can- 

 delaria concolor and Buellia myriocarpa. On an old leather shoe, 

 with Candelariella epixantha, Fat jo Ranch, altitude 2500 feet. On 

 shale at San Gregorio Beach; this last has a more uniform and better 

 developed thallus than other specimens. 



Found throughout Europe and North America. 

 (hageni, named for Karl Gottfried Hagen, 1749-1829, Professor 

 of botany at Konigsberg.) 



15. LECANORA FRUSTULOSA (Dicks.) Ach. 



Lichen Jrustulosus Dicks. Crypt. Fasc. Ill: 13, pi. 8, /. 10. 1793. 

 Lecanora frustulosa Ach. Lich. Univ. 405. 1810. 

 Lecanora frustulosa Tuck. Syn. N. Am. Lich. I: 186. 1882. 

 Lecanora frustulosa Cummings, Williams, and Seymour, Decades of 

 N. Am. Lichens, no. 262, San Diego, Calif. 



Thallus thick, somewhat determinate, of wart-like areoles, or 

 squamules, these distinct, becoming flattened and more or less radi- 

 ately effigurate; dispersed, or crowded and nearly imbricate; color 

 yellowish white or whitish; KOH yellow; CaCl2O2 yellowish. 



Apothecia small to medium, sessile, plane to convex, the disk 

 brownish black or black; margin thick, entire or somewhat crenate; 

 paraphyses coherent, brownish, their tips darker; hymenium blue 



- O 



with I; spores ellipsoid or oblong, /* 



10 15 



On rocks in the foothills; a lichen of northern Europe and North 

 America. 



Our specimens all seem to belong to the form with white thallus 

 (v. albida), instead of the more typical form with yellowish color, and 

 are not always easy to separate from Lecanora coilocarpa and Lecan- 

 ora air a in external appearance. 



16. LECANORA VARIA (Ehrh.) Ach. 



Lichen varius Ehrh. Crypt. Exsicc. no. 68, 1785. 



Lecanora varia Ach. Lich. Univ. 377. a and /?, 1810. 



Lecanora varia Tuck. Syn. N. Am. Lich. I: 191. 1882, (in part). 



