THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 223 



i. USNEA FLORIDA (L.) Hoffm. 



Lichen floridus Linne, Sp. Plant. 2 : 1154. 1753. 

 Usneaflorida Hoffmann, Deutsch. Fl. 133. 1791. 

 U snea florida Herre, Proc. Wash. Acad. Sci. 7 : 343. 1906. 

 Usnea barbata a. florida Tuck. Syn. N. Am. Lich. I: 41. 1882. 



Thallus terete, tufted, erect, stout, rather rigid, shrub-like, spread- 

 ing branched, beset with stiff straight fibrils; epidermis smooth or 

 more or less roughened with minute papillae or tubercles; color gray- 

 green. 



Apothecia medium to very large, numerous, terminal; color a pale 



tan, very pale flesh-color, or sometimes whitish; spores p. 



7-33 - 9-75 



On trees and fences throughout; dwarfed and usually sterile near 

 sea-level; larger and fruiting profusely above 1000 feet. An exceed- 

 ingly variable plant of world-wide distribution. 



2. USNEA HIRTA (L.) Hoffm. 



Lichen hirtus Linne, Sp. Plant. 2: 1155. 1753. 

 Usnea hirta Hoffmann, Deutsch. Fl. 2: 133. 1791. 

 Usnea hirta Herre, Proc. Wash. Acad. Sci. 7: 343. 1906. 

 Usnea barbata a. florida* hirta Tuck. Syn. N. Am. Lich. 1: 41. 1882, 

 Thallus small, tufted, shrub-like, erect, rigid; branches wide- 

 spread, curving, thickly clad with short fibrils; the whole plant 

 densely beset with soredia. 



Apothecia small, rare; spores " j". 



7-10 



On trees and fences throughout but most frequent in the foothills 

 at moderate elevations. Occasional on rocks, Alameda County, 

 Bolander, in Tuckerman Herbarium. 



A common lichen of the northern hemisphere. 



3. USNEA RUBIGINEA (Michx.) 



Usneaflorida rubiginea Michaux, Fl. Bor. Am. 2: 332. 1803. 

 Usnea rubiginea Herre, Proc. Wash. Acad. Sci. 7: 343. 1906. 

 Usnea barbata a. florida* hirta** rubiginea Tuck. Syn. N. Am. Lich. 

 I:i. 1882. 



