THE LICHEN FLORA OF THE SANTA CRUZ PENINSULA 199 



Var. POLYSPORA Herre, new variety. 



Thallus and spores as above, the spores being from 1 6 to 20 in the 

 asci and much smaller than given by authors for olivacea. This 

 form is abundant on Quercus wislizenii on Black Mountain, at an 

 altitude of 1600 feet. 



Parmelia olivacea is generally distributed over the north tem- 

 perate zone. 



8. PARMELIA GLABRA Schaerer. 

 Parmelia glabra Schaer. Lich. Helvet. Spicilegium, 466. 



Thallus membranaceous, expanded, orbicular to indeterminate; 

 upper surface smooth or somewhat lacunose, often appearing pol- 

 ished and glistening or shiny; lobes rounded, crenate and irregularly 

 cleft, from appressed often becoming centrally erect or ascendant 

 and densely crowded or imbricate; color pale to dark olive-brown; 

 beneath dark brown to black, with paler brown margin; short 

 brown or black fibrils more or less abundant; medulla red with 

 CaCl 2 O 2 . 



Apothecia not abundant, medium or large size, with dark chest- 



49 7^ 

 nut disk and upturned, minutely dentate margin ; spores 



On rocks and moss along the summit of the range; abundant at 

 Castle Rock. Reported also by Dr. Hasse from southern Cali- 

 fornia. 



A common lichen on trees in Central Europe. 



9. PARMELIA EXASPERATA (Ach.) Nyl. 



Collema exasperatum Ach. Lich. Univ. 645. 1810. 



Parmelia exasperataNyl. Not. Sallsk. pro F. et F. Fenn. Forrh. n. s. 



5: 120 (note). 1866. 



Thallus appressed, orbicular or sub-orbicular, with marginal lobes 

 much dissected or only crenate lobulate; central portion wrinkled 

 and folded, more or less imbricate, becoming rough and densely 

 beset with short papillae; dark brown in color; under side black, 

 with many short black fibrils; no reaction with KOH or CaCl 2 Oi. 



Sterile with us. 



On rocks throughout, but not very conspicuous or abundant any- 

 where. A rock lichen of Europe and North America. 



