THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 173 



Tuckerman states "apothecia middling to ample, lateral, sub- 

 sessile; disk pale brick-colored, margin flexuously lobed; spores 



. 12 16 

 oblong, ellipsoid, - - /v 



Abundant on granite cliffs above the sea near Point San Pedro, 

 altitude 300 feet; a few plants also found at Point Pescadero at an 

 elevation of 50 feet. Still rather frequent on metamorphic rocks at 

 Twin Peaks, San Francisco, at an altitude of 600 to 755 feet. 



The type locality, Mission Dolores, is now in a thickly settled part 

 of San Francisco and the plant is rapidly becoming extinct; material 

 such as Bolander collected can no longer be obtained. 



A very distinct lichen, always associated with Lecanora pinguis 

 and L. bolanderi Tuck. Apparently limited in its range to the 

 strictly maritime portions of the Santa Cruz Peninsula. 



SECTION PLACODIUM (Hill.) Th. Fries. 



Thallus sub-foliaceous, marginally lobed, centrally passing from 

 crustaceous forms to squamulose; cortex present above; apothecia 

 sessile. 



3. LECANORA PINGUIS Tuck. 



Lecanora pinguis Tuck. Proc. Am. Acad. Arts & Sci. 6: 268. 1864. 

 Lecanora pinguis Tuck. Syn. N. Am. Lich. I: 185. 1882. 

 Lecanora pinguis Cummings and Seymour, Decades of N. Am. 

 Lichens, no. 130, San Mateo County, Calif. 



Thallus thickened, tartareous, closely adnate, finally of wart-like, 

 roughened areoles; centrally the areoles scarcely distinct, but radi- 

 ately plicate at the circumference; color a peculiar yellowish-greenish 

 to olive gray; sometimes dusky centrally or occasionally suggesting 

 sulfur; medulla a very pale sulfur; thallus orange with CaCl 2 O 2 ; 

 KOH-. 



Apothecia medium to very large, becoming lobate; adnate, usually 

 numerous, strongly resembling those of Lecanora phryganitis; the 

 disk yellowish flesh-color, sub-pruinose, becoming turgid and exclud- 

 ing the thick margin which is finally much flexed and lobed; thecium 

 blue with I; spores oblong to narrow ellipsoid, rarely slightly bowed, 



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