236 HERRE 



Thallus foliaceous, appressed, expanded, orbicular or stellate; 

 lobes much and intricately dissected, their tips ascendant and more or 

 less fibrillose; lobes either smooth or with granulose powdery mar- 

 gins; color yellow to orange, rarely greenish to whitish; beneath 

 white or greenish white, with scattered fibrils of the same color. 



Apothecia abundant, medium to large, their disks dark orange; 

 margin entire or minutely crenulate. 



Very abundant in the valleys and foothills on trees and dead 

 wood; especially noticeable on ^Esculus calif ornicus. 



Passing into states not distinct from polycarpus, but when well 

 developed a very well marked form. 



4. XANTHORIA LYCHNEA PYGM^A (Boiy). 

 Borrera pygmaa Bory, in Fries, Lich. Europ. Reform. 73. 1831. 

 Theloschistes lychneus b. pygmceus Tuck. Syn. N. Am. Lich. I: 51. 

 1882. 



Thallus small, sub-orbiculate and pulvinate, or effuse; the lobes 

 much narrowed or minute, irregular, becoming more or less rounded 

 and erect, the tips and margins finally granulose-powdery; color 

 orange or orange-yellow. 



Apothecia small, dark orange, not numerous, the entire margin 



becoming flexuous and granulose. Spores -^ P- 



On rocks in the maritime belt, San Bruno Mt., 1000 to 1300 feet 

 elevation. In the Tuck. Herbarium are specimens from the. Oak- 

 land Hills, elevation 2000 feet, and from Olima, Marin County; 

 these are labelled Theloschistes parietinus var. finmarkicus Ach. Dr. 

 Hasse has also collected it on the ocean bluffs at Newport, Los 

 Angeles County. 



5. XANTHORIA RAMULOSUS (Tuck.) Herre. 



Theloschistes ramulosus Tuck. Syn. N. Am. Lich. I: 51. 1882. 

 Theloschistes ramulosus Herre, Proc. Wash. Acad. Sci. 7 : 349. 1906. 



Thallus small, effuse, closely appressed; the minute and scattered 

 lobules but little divided; color pale yellow to greenish yellow. 



Apothecia very small, entire, concolorous, or at length orange; 



5-6 



spores > /*. 



1416 



