THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA l8l 



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

 most abundant on Msculus californicus, 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 Candclariella 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, 1 749-1829, Professor 

 of botany at Konigsberg.) 



15. LECANORA FRUSTULOSA (Dicks.) Ach. 



Lichen frustulosus 'Dicks. Crypt. Fa.sc. 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 efiigurate; dispersed, or crowded and nearly imbricate; color 

 yellowish white or whitish; KOH yellow; CaCl202 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 



with I; spores elUpsoid 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 atra in external appearance. 



16. LECANORA VARL\ (Ehrh.) Ach. 



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



Lecanora varia Ach. Lich. Univ. 377. a and 1^, 18 10. 



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



