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 Msculus calif ornicus . 



Passing into states not distinct from polycarpus, but when well 

 developed a very well marked form, 



4. XANTHORIA LYCHNEA PYGM.EA (Bory). 



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

 Theloschistes lychneus h. pygmaus 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 7 /*. 



On rocks in the maritime belt, San Bruno Mt., 1000 to 13CXD feet 

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

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

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

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

 Angeles County. 



5. XANTHORL\ 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 , {i. 



' 14—16 



