THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 243 



Apothecia numerous, of medium size, innate, sessile, black, the 

 disk at first flat or plano-convex, bordered by a thin, erect entire 

 margin; soon convex or swollen and the margin disappearing; more 

 or less greenish- or pale-pruinose; epithecium dark brown; para- 

 physes thread-like, sub-coherent, their tips hardly enlarged; theci- 

 um blue with I; hypothecium very broad, reddish brown to black- 



7 — 10 

 ish brown; spores bilocular, ellipsoid, -„ it-. 



On rocks all along the ocean shore and in the foothills bordering 

 the Bay. Oakland Hills, Bolander, in Tuck. Herb. Recorded by 

 Hasse from the islands off the coast of southern California. Origi- 

 nally described from the coast of South Africa, at the Cape of Good 

 Hope. 



6. BUELLIA ALBO-ATRA (Hoffm.) Th. Fr. 



Lichen albo-ater Hoffmann, Enum, Lich. 30. 1784. 

 Buellia alho-atra Th. Fr. Lich. Scand. 2: 607. 1874. 

 Buellia albo-atra Tuck. Syn. N. Am. Lich. H: 92. 1888. 



Thallus small, effuse, thin to moderately thick, from uniform 

 becoming fissured and sub-areolate, with an irregularly roughened 

 surface; color clear white, often with a silvery lustre; KOH faintly 

 yellowish or — ; CaCl202 — . 



Apothecia numerous, small, sub-innate to adnate and sessile, 

 black; disk from plane soon strongly convex, naked or gray pruinose, 

 the proper margin not apparent but often bordered by a false white 

 or darkening thalline margin; epithecium slightly granulose, yellow- 

 ish brown; hypothecium deep brown; paraphyses becoming free, 

 moderately stout, their slightly enlarged and sometimes bluish 

 dusky and dark brown tips cut off by a septum; asci clavate; the- 

 cium permanent deep blue with I; spores brown, ellipsoid or bowed 

 or bean-shaped, from quadrilocular becoming muriform, irregularly 



, • , • 73 — 9-75 , 12 — 14.6 



disposed m the asci, /;, and ,,- /<• 



13 — 22 20 — 28 



On the bark of oaks in the foothills and on Pseudotsuga taxijolia 

 at the summit of the range. 



The variety saxicola is common in the foothills on rocks, and 

 occurs also under overhanging sandstone walls at Devils Canon. 

 It is distinguished by the sub-orbiculate to effuse thallus of minute 



