LICHENS OF SANTA CRUZ PENINSULA 353 



Fruiting specimens occur in abundance on oaks and Uinbcllu- 

 laria, about the head of Alpine Creek Cafion, at an altitude of 

 looo feet. Nearly all the apothecia found belie the specific 

 name, being imperforate. 



Lichen ^ erf or atus Wulf. in Jacq. Coll. i : ii6, //. j. 1786. 

 Parmclia perforata Ach. Meth. Lich. 217. 1803 ; Ach. Lich. 



Univ. 459. 1810. 



4. PARHELIA HERREI Zahlbruckner, sp. nov. 



Thallus narrow, lobed and deeply dissected ; smooth above ; 

 the lobes sinuately pinnatifid, their tips rounded or crenate, 

 sometimes sorediate ; centrally becoming much complicate and 

 imbricate; margin fringed with long, black, conspicuous cilia. 

 Beneath black and densely clothed with long black fibrils. 

 Surface a dull pearly gray, var3'ing to a slate-gray. 



Apothecia not seen. 



" P. siniioscB Ach. affinis, differens thallo semper esoredioso, 

 in margine ciliato, KHO supra flavo," Zahlbruckner. 



This distinct Parmelia has been found but once. A few speci- 

 mens were found growing on earth in the crevices of sandstone 

 in Pilarcitos Creek Canon, about two miles from the Pacific, at 

 an altitude of 200 feet. It was mixed with Parmelia saxatilisy 

 Tkeloschistes Jlavicans, Cladonia fiircata racemosa and SphcB- 

 rop/iorus globostis. 



Specimens are in the herbaria of Leland Stanford Junior 

 University, Dr. A. Zahlbruckner, Dr. H. E. Hasse, and the 

 author. As yet no other specimens have been discovered. 

 Parmelia herrei A. Zahlbr. in lift. 1905. 



Type, No. 516 Stanford University Herbarium. T3'pe lo- 

 cality, Pilarcitos Creek Canon, two miles from the Pacific, 

 Santa Cruz peninsula, Cal. Coll. A. C. Herre, May 28, 1904. 



5. PARMELIA TILIACEA (Hoffm.) Ach. 

 Thallus much narrowed, membranaceous, often suborbicular ; 

 smooth, becoming finely wrinkled ; closely adherent to the sub- 

 stratum ; lobes contiguous, often subimbricate, sinuous, deeply 

 incised; margins crenate or rounded; color gray, varying 

 from nearly white to green, but always of a peculiarly bright, 



