200 HERRE 



lo. PARMELIA FULIGINOSA (E. Fr.) Nyl. 



Parmelia olivacea var. fuliginosa E, Fries in Duby, Bot. Gall. 602. 



1830. 

 Parmelia fuliginosa Nyl. Flora, 346. 1868. 



Thallus orbicular, membranaceous, appressed; lobes short, round- 

 ed, broad, more or less imbricate, marginally crenate; surface more 

 or less covered with concolorous isidia or scurfy growth; color green- 

 ish olive or brown to olive-black; beneath brown to blackish, 

 rugose or channelled, with black fibrils. Medullared with CaCl202. 



No fertile specimens collected. 



Not rare on twigs in the mountains, and also occurring on rocks 

 throughout. Our tree form is near the variety Icetevirens Nyl., but 

 the t3^ical plant is found on rocks. Common in the north temper- 

 ate zone. 



II. PARMELIA CONSPURCATA (Schaer.) Wainio. 



Parmelia olivacea var. conspurcata Schaerer, Lich. Helvet. Spicil. 



Sect. X, 466. 1840. 

 Parmelia conspurcata Wainio, Med. Soc. Faun. Fl. Fenn. 14: 22. 



1888. 

 Parmelia conspurcata Herre, Proc. Wash. Acad. Sci. 7: 357. 1906. 



Thallus small to medium, orbiculate or irregular; inner lobes 

 somewhat ascendant, their margins often confluently isidiose-sore- 

 diate; marginal lobes flatter, rounded, sub-imbricate, crenate; 

 color brown, but varying from ashy gray to chocolate. The whole 

 surface sprinkled with conspicuous, white, erumpent soredia, these 

 passing into the dusky isidiose soredia on older portions of the thal- 

 lus; beneath brown, varying from buff to black; thickly set with 

 short, shaggy fibrils; both cortex and medulla yellow with KOH; 

 medulla red when treated with KOH followed by CaCl202. 



Sterile. 



Abundant on a huge sandstone rock at the summit of the range 

 on the Bear Gulch road, altitude 1900 feet. Common on the San 

 Bruno Hills, on rocks and earth, at an altitude of 800-1100 feet. 



Not rare in Europe but not collected in North America except by 

 Bruce Fink, who says "frequent on trees and rarely on rocks," 

 in Lichens of the Northern Boundary. 



