THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 235 



i. XANTHORIA PARIETINA (L.) Th. Fr. 



Lichen parietinus Linne, Sp. Plant. 2: 1143. 1753. 

 Xanthoria parietina Th. Fries, Lich. Arctoi. 67. 1860, in part. 

 Xanthoria parietina Th. Fries, Lich. Scand. 1 : 145. 1871. 

 Theloschistes parietinus Norm. Nyt. Mag. Naturvid. 7 : 229. 1853. 

 Theloschistes parietinus Tuck. Syn. N. Am. Lich. I: 49. 1882. 

 Theloschistes parietinus Herre, Proc. Wash. Acad. Sci. 7 : 348. 1906. 



Thallus foliaceous, more or less orbicular, appressed; lobes broad, 

 entire, crenate, often plaited; sometimes short, thick, and somewhat 

 pruinose; sometimes forming a thick, effuse crust; color yellow to 

 orange. 



Apothecia small to medium size, concolorous; margin thick, 

 prominent, entire, becoming flexuous; finally disappearing; spores 



12.25 - 17 



On trees, rocks, roofs, and fences. A wide spread lichen, with us 

 most abundant in the lowlands and foothills about San Francisco 

 Bay. 



2. XANTHORIA POLYCARPUS (Ehrh.) 



Lichen polycarpus Ehrhart, Plant. Crypt. Exsic. no. 136. 1785. 

 Theloschistes polycarpus Tuck. Syn. N. Am. Lich. I: 50. 1882. 

 Theloschistes polycarpus Herre, Proc. Wash. Acad. Sci. 7: 348. 

 1906. 



Thallus very small, sub-orbicular, stellate or more often effuse, 

 closely appressed, yellow; lobes much cleft, narrow. 

 Apothecia small and very numerous, sometimes concealing the 



r, - Q ^ 



thallus; disk concolorous or orange; spores ^ j". 



On trees. Common in the valleys and lower foothills. Widely 

 distributed over the northern hemisphere. 



3. XANTHORIA LYCHNEA LACINIOSA (Schaer.) 



Parmelia parietina laciniosa Schaerer, Lich. Helvet. Spicil. 477. 



1840. 

 Theloschistes lychneus laciniosa Tuck. Syn. N. Am. Lich. I: 51. 



1882. 

 Theloschistes lychneus laciniosa Herre, Proc. Wash. Acad. Sci. 7: 



349. 1906. 

 Proc. Wash. Acad. Sci., May, 1910. 



