264 HERRE 



The form on tree trunks is a much paler and brighter yellow than 

 the plant usually is on fences, while the latter has darker and duller 

 colored apothecia. The lichen often grows intermingled with Lecan- 

 ora alhella cancriformis . 



Collected by Bolander on Pinus (insignis) radiata, near Pescadero, 

 and on Myrica near San Francisco, and by Dr. Farlow at Santa 

 Cruz. 



Not certainly known in North America outside the Santa Cruz 

 and Monterey peninsulas, the plant recorded by Dr. Hasse from 

 Santa Monica under this name being something else. Widely 

 distributed in Europe. 



LECIDEA PACIFICA Herre, new species. 



Lecidea pacifica Herre, Ex. Lich. Santa Cruz Pen. Calif, no. 635. 



Thallus thin to very thin, from determinate soon effuse, sometimes 

 bordered by a scarcely evident black hypothalline line; from con- 

 tiguous becoming minutely fissured and areolate,the surface smooth 

 or minutely roughened ; appearing to the eye as a uniform brownish 

 gray film; KOH light yellow; CaCl202 — • 



Apothecia medium to rather large, sessile, scattered, dark red- 

 brown to blackish-brown and reddish black; disk at first plane or 

 flatfish with an evident, thick, entire, sometimes flexuous margin; 

 becoming convex, the margin finally disappearing; epithecium 

 yellowish brown; paraphyses simple, free, thread-Kke, their blackish 

 brown tips subcoherent; hypothecium colorless; thecium blue with I; 

 spores variouly disposed in the clavate asci, ellipsoid to short 



7- - 8.5 



ellipsoid, ^^ jJ-. 



12—16 



Rare ; forming pale spots or blotches on granite rocks in the bed 

 of Peters Creek, altitude about iioo feet. 



