THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 245 



angular, smooth areoles, upon a black hypothallus; KOH — or 

 brownish ; CaCl202 — • 



Apothecia small or minute, innate-sessile or closely appressed, 

 black; the flat disk surrounded by a thin but prominent and entire 

 margin; more rarely the disk is roughened or papillate, moderately 

 convex, the margin disappearing; epithecium thick, black; hypo- 

 thecium brownish black; asci clavate or ventricose; thecium blue 

 with I; paraphyses sub-coherent at their tips, becoming free, slen- 

 der, the apices but little enlarged, umber to blackish brown; spores 



ellipsoid, bilocular, not constricted at the middle, '- n. 



On rocks in the foothills at slight elevations; common in Europe 

 and the eastern United States. 



9. BUELLIA LEPIDASTRA Tuck. 



Lecidea lepidastra Tuck, Amer. Journ. Arts. & Sci. 25 : 429. 1858. 

 Buellia lepidastra Tuck. Gen. Lich. 186. 1872. 

 Buellia lepidastra Tuck. Syn. N. Am. Lich. II: 90. 1888. 

 Buellia lepidastra Hasse, Lich. South. Calif, ed. 2, 15. 1898. 



Thallus of distinct, thickish, flat or plano-convex areoles forming 

 a fissured crust, passing at the circumference into sub-lobate and 

 crenulate or more dilate areoles or squamules, which often form a 

 limiting, sub-orbiculate border; no hypothallus to be made out; 

 color of a putty-like whiteness; KOH yellow; CaCl202 — . 



Apothecia numerous, often crowded, circular to angulose, small, 

 adnate or sessile, black; the naked disk at first flat, with a thin 

 entire margin, becoming plano-convex or moderately rounded, the 

 margin more or less obsolete; paraphyses moderately stout, septate, 

 from agglutinate becoming free, their slightly enlarged and dusky 

 tips brown to black at the very apex; asci clavate, thecium deep 

 blue with I; hypothecium blackish brown; spores bilocular, blunt- 



6 — 7.5 

 ellipsoid or pointed, not constricted at the middle,- — -^ -P-', Tuck., 



"6-8 » 



10 — 20 



On stones in the foothills, at elevations of a few hundred feet, 

 forming small, sub-efiigurate patches among other lichens. A 

 North American Hchen originally described from Vermont. 



