352 HERRE 



Point, and also on old fences along the county road from Span- 

 ishtown northward for six or eight miles. None was found at 

 an altitude of more than 50 feet and the best specimens grew 

 just above high tide. 



Lichen ^ei'latiLS L. Syst. Nat. ed. 12. 712. 1767. 

 Par7nelia -pcrlata Ach. Meth. Lich. 216. 1803 ; Lich. Univ. 

 458. 1810. 



2. PARHELIA FLAVICANS Tuckerman. 



Thallus large, orbicular, becoming very large and irregular, 

 as in the following species ; surface smooth, or centrally more 

 or less wrinkled and plicate ; often isidiose-sorediate ; lobes long, 

 sinuous, imbricate, marginally crenate and undulate, their tips 

 thin and rounded ; color of thallus pale yellow or more often a 

 yellowish green ; beneath black, with chestnut margin ; smooth 

 or wrinkled ; generally naked, but also more or less inter- 

 ruptedly black fibrillose. Apothecia not uncommon ; disk 

 chestnut in dried specimens ; in the field sometimes of same 

 color as thallus ; margin entire or crenulate, often sorediate. 



Common on rocks in the foothills. 



A well-marked species, not to be confused with any other. 

 Parmelia pcrlata JiavicansTMQ^i. Lich. Calif. 13. 1866. 

 Parmelia jlavicans Tuck. Syn. N. Am. Lich. i : 53. 1882. 



3. PARMELIA PERFORATA (Wulfen) Acharius. 



Thallus large, finally greatly dilated, smooth, gray, tinged 

 with greenish, or whitish ; the ample lobes crenate, becoming 

 marginally much dissected ; margins of inner lobes often con- 

 fluently gray sorediate ; lobes fringed (f. ciliata Nyl.) with long, 

 black, simple or branched cilia ; under side black, with a broad 

 chestnut margin ; interruptedly clothed with dense patches of 

 black fibrils. Apothecia rare, medium to large ; margin entire ; 

 disk chestnut ; rarely perforate. 



On trees, mossy rocks, and earth. 



This large and handsome plant occurs throughout the Santa 

 Cruz mountains, usually sterile. On shaded moss-covered sand- 

 stone cliffs immense circular mats are formed ; in many cases 

 these coalesce into gigantic carpets covering many square feet. 



