2 24 HERRE 



Thallus much like that of Usnea hirta; epidermis smooth to papil- 

 late-scabrous; color varies from bright to dark rusty red or brick-red. 

 Apothecia (not seen) concolorous. 



Along the coast from Santa Cruz northward, on trees. Occasional 

 in the mountains, Big Basin, and near the head of Alpine Creek. On 

 dwarfed shrubs on San Bruno Mt., alt. iioo feet. Very abundant 

 and conspicuous on Pinus radiata at Pacific Grove. 



A very handsome lichen, generally distributed over North America 

 and also found in South America, parts of Europe, and South Africa. 



4. USNEA CERATINA Ach. 



Usnea ceratina Acharius, Lich. Univ. 619. 1810. 



Usnea ceratina Herre, Proc. Wash. Acad. Sci. 7: 344. 1906. 



Usnea barbata b. ceratina Tuck. Syn. N. Am. Lich. I: 41, 1882. 



Thallus fruticose, much branched, at first erect but becoming pen- 

 dulous; reaching a length of 6 to 8 inches, or perhaps more; thickly 

 covered with long slender curling fibrils; epidermis smooth to warty 

 or papillose. 



Apothecia abundant, medium to large; concolorous, tan, or very 



5 - 7J 

 pale flesh-color; spores circular to short ellipsoid, — ^^ M. 



On trees and dead wood; abundant at 2000 feet and above. 

 Found in all temperate and tropical regions but absent from the 

 arctic and sub-arctic realms. 



5. USNEA DASYPOGA (Ach.) Nyl. 



Usnea plicata dasypoga Ach. Meth. Lich. 312. 1803. 



Usnea dasypoga Nyl. St. Gall. Nat. Ges. 202. 1876. 



Usnea dasypoga Herre, Proc. Wash. Acad. Sci. 7: 344. 1906. 



Usnea barbata c. dasypoga Tuck. Syn. N. Am. Lich. I: 41. 1882. 



Thallus greatly elongated and pendulous, slender, terete; thickly 

 beset with short spreading fibrils; epidermis usually smooth or 

 minutely roughened ; color gray or yellowish green (straw-color) ; the 

 principal branches often blackening basally. 



Apothecia small, infrequent, rather pale; spores — /<. 



Common on trees and shrubs above 600 feet; best developed in the 



