ADDENDA 



LECIDEA QUERNEA (Dicks.) Ach. 



Lichen querneus Dickson, Plant. Crypt. Brit. Fasc. I: 9. andT. II: 



f. 3. 1785. 



Lecidea quernea Acharius, Meth. Lich. 63. 1803. 

 Biatora quernea Tuck. Genera Lich. 159. 1872. 

 Biatora quernea Syn. N. Am. Lich. Part II: 28. 1888. 



Thallus effuse, spreading widely, of minute, sorediose, greenish- 

 yellow granules which form a pale or bright but thin leprose crust, 

 which is rarely thickish; usually without an evident hypothallus but 

 sometimes a white or whitish hypothallus is present; dark reddish 

 brown with KOH; CaCl 2 2 -. 



Apothecia minute to small, immersed, circular, at first plane, 

 but soon becoming convex and finally sub-globose and emergent; 

 without margin; disk reddish, reddish-brown, and dull brown to 

 brownish-black; epithecium broad, dark or reddish, granulose; the- 

 cium pale, the paraphyses slender, embedded in the hymenial 

 gelatine; blue with I; hypothecium yellowish to brown, with brown 

 or violet granules scattered through it; becoming reddish with 



14 



KOH; asci broadly clavate, -/*; spores ellipsoid or ovoid, 



26.5 ~ 38 



colorless, or more rarely brown, in specimens from bark measuring 



5-S5 - 7-3 5-5 - 6.5 



/*; specimens from fences have spores - /*. 



8.8 - 11.7 9.75 - 12.25 



Forming powdery, indeterminate patches on the bark of Pinus 

 radiata along Ano Nuevo Creek, altitude 100 feet, and also spreading 

 extensively over old fences along the sea coast between Pigeon 

 Point and Scott Creek. On old fences at Santa Cruz and all about 

 Monterey Bay and southward along the coast of Monterey penin- 

 sula; on trunks of Cupressus macrocarpa along the coast south of 

 Monterey. 



