So HERRE 



A common xerophyte of calcareous earth throughout Europe and 

 North America; in this country most abundant in the western half. 



2. LECIDEA GLOBIFERA Ach. 



Lecidea glohifera Ach. Lich. Univ. 213. 1810; Switzerland. 

 Biatora glohifera Tuck. Syn. N. Am. Lich. II: 10. 1888. 



Thallus of small or medium size, thickish, rigid, rounded and cre- 

 nate lobate, ascendant and imbricate scales; their surface usually 

 polished and often concave; color pale or whitish brown and greenish 

 to various shades of chestnut, the under side white; KOH — ; 

 CaCl202 -. 



Apothecia numerous, small to medium size, marginal, elevated- 

 sessile, black or brown-black, moderately convex to sub-globose, soH- 

 tary and circular or often confluent and irregular; margin visible only 

 on young apothecia; white within to the naked eye; paraphyses 

 conglutinate and difficult to make out, the epithecium a broad 

 dark brown (reddish-brown?) band; hypothecium very pale 

 brownish; thecium very pale reddish or becoming colorless, blue 

 with I, the asci narrow, clavate; spores rare, eUipsoid and ovoid, 



9.75 - 14.7 



On dry rocks in sunny places in the foothill canons; the only local- 

 ity from which I have specimens obtained within our territory is 

 Stevens Creek Canon, alt. 900 feet. It is common in Alum Rock 

 Park, Mt. Hamilton Range, near San Jose, at an altitude of about 

 500 or 600 feet. In our plant the scales are smaller than given by 

 Tuckerman, and smaller and darker than in a specimen from the 

 Sprague Herbarium, collected in Washington. 



A hchen of calcareous earth, occurring over the greater part of 

 Europe and North America; in the latter region most abundant on 

 the Pacific Coast. 



3. LECIDEA SCOTOPHOLIS (Tuck.) Herre. 



Biatora scotopholis Tuck. Lich. Cahf. 24. 1866. 



Biatora scotopholis Tuck. Syn. N. Am. Lich. II: 11. 1888. 



Thallus effuse, of minute, rather thin, rounded, areolate squam- 

 ules with rugulose surface; their borders finely crenate and slightly 



