LICHENS OF SANTA CRUZ PENINSULA 35 1 



h. Under siile black, brown-margined; thallus expanded. 

 i. Lobes marginally ciliate; thallus medium to very large ; 

 glaucous white ; on trees and rocks.. 3. perforata,, "^^^^z. 

 it. Margin not ciliate ; thallus small to medium, pearly white ; 



maritime, on fences, roofs, rocks i. perlata,, 351. 



hh. Under side not brown-margined; thallus narrowed, 

 branched. 

 j. Always sterile. 



k. Thallus not reticulate above; margin ciliate; lobes 



very narrow, short 4. herrei,, 353' 



kk. Surface of thallus reticulate; margin not ciliate; lobes 

 broader, long, man}^ cleft, apically retuse. 



6, saxatilis^ 354* 

 JJ. Apothecia abundant, margin crenulate; thallus adnate, 

 lobes narrow, sinuate; color bright ...5. iiliacca^ 353* 

 g'g-. Color yellow to yellowish green. 



/. Beneath black, with chestnut or brown border. 

 ?n. Margin of lobes not confluently white sorediate. 

 n. Thallus smooth or isidiose-sorediate ; on rocks. 



2. JlavicuTis, 352* 

 n7t. Surface wrinkled, plicate, with concolorous soredia ; 



on stones and shrubs 12. caper ata^ 357- 



mm. Edges of lobes confluently white sorediate ; surface 

 wrinkled, at least marginally ; on trees, fences, roofs. 



13. soredica^ 358. 

 //. Beneath pale or dark, margin darker ; surface more or less 

 isidiose ; fibrils concolorous, scattered, short. 



14. conspcrsa^ 35^- 



I. PARHELIA PERLATA (L.) Acharius. 



Thallus greenish pearl-gray, dilated, membranaceous ; mar- 

 gin thin, smooth, rounded and irregularly lobulate ; rest of 

 thallus thickened, convolute, more or less ascending ; margins 

 of inner lobes covered with confluent, concolorous soredia ; un- 

 der surface black, wrinkled, papillose, margin brownish ; from 

 strongly and densel}^ black fibrillose to smooth. 



Sterile. Apparently confined to a narrow strip along the 

 Pacific coast, not occurring in the mountains or on the Bay 

 shore. 



On the roof of an old house on the sea-beach, near Pilar 



