356 HERRE 



Tuc-'kermvin?, Parmelia physodcs c. enteromor^ha and Parmelia 

 physodes d. vittata. 



Parmelia enter omor^ha Ach. Meth. Lich. 252. 1803 ; Bitter, 

 Hedwigia, 40: 233; t. 11; fl. 11, 12, ij. 1901. 



9. PARMELIA OLIVACEA (L.) Acharius. 



Thallus membranaceous, expanded, orbicular or becoming 

 irregular, appressed ; usually smooth and polished, but finally 

 wrinkled, rough, and isidiophorous ; lobes rounded, crenate, 

 flat; color olive-brown to very dark brown, almost black; 

 beneath black, with short black fibrils. Apothecia concolorous 

 or chestnut ; margin crenate or dentate ; very abundant on tree- 

 growing forms, but rare or wanting on those growing on rocks. 



Common on rocks, trees, and shrubs throughout. 



There is a form {P. o. -panniformis Nylander) in which the 

 inner lobes become erect or ascendant, irregularl}^ cleft, and 

 densely crowded or imbricate. 



This subspecies forms large shagg}^ patches on the under or pro- 

 tected side of sandstone ledges at Castle Rock and other points 

 on Castle Rock Ridge, at an altitude of 3000 feet and above. 



For the determination of this subspecies the author alone is 

 responsible. 



Lichen olivaccus L. Sp. PI. 2 : 1143. 1753. 

 Parmelia olivacea Ach. Meth. Lich. 213. 1803 ; Ach. Lich. 



Univ. 462. 1810. 



10. PARMELIA SOREDIATA (Ach.) Nylander. 



Thallus indeterminate or suborbicular ; the marginal lobes 

 much dissected or merely crenate lobulate ; centrally wrinkled 

 and folded, more or less imbricate ; becoming rough and 

 isidiose, the isidia thickly sprinkled with tiny white soredia ; 

 color dark brown ; beneath black, with many short black fibrils. 



No fertile specimens found. 



On rocks throughout, but rare below the summit of the range, 

 and at no place very abundant ; my best specimens came from 

 Loma Prieta, at an altitude of 3788 feet. 



Similar to Parmelia olivacea in form and color, but differing 

 in the presence of soredia and in the chemical reaction. Par- 

 melia olivacea, medulla K— C — . 



