GENERA AND SPECIES. 149 



S. Lecanora Bockii. Thallus granular, somewhat 

 areolate ; dark. Apothecia small, slightly raised above 

 thalhis. Disk somewhat lighter in color than thallus. 

 Spores rare, typical. 



4. Lecanora calcarea. Thallus areolate, dark. 

 Apothecia small, usually numerous, irregular, margin 

 slightly raised above the brown to dark-brown disk. 

 Spores elongated, slightly curved, 15.5^ X 4/x,. 



5. Lecanora Hageni. Thallus granular to indis- 

 tinctly warty, gray to dark. Apothecia small, numer- 

 ous ; margin entire, elevated ; light-gray. Disk reddish- 

 brown to dark-brown. Spores ovoid or elliptical, 7.5/x 

 X 4.5/x. 



Nos. 4 and 5 are generally associated with species 

 of Placodium. 



6. Lecanora pallida. Thallus uniform, areolate, 

 rarely granular and warty, pale color. Apothecia 

 medium to large, somewhat lobulate or folded, elevated 

 margin. Disk flattened, pale-brown to brown. Spores 

 typical, 12/i, X 6/u,. 



7. Lecanora Cupressi. Thallus granular to warty, 

 pale-green. Apothecia small to medium, numerous, 

 margin crenulate. Disk pale yellowish-brown. Spores 

 typical, slightly curved, 13/w, X 4.5/x. 



8. Lecanora varia. Thallus much as in L. 

 Cupressi, more distinctly warty. Apothecia as in 

 No. 7, margin more elevated ; spores the same. 



Nos. 7 and 8 are evidently closely related, if not 

 identical. L. varia is quite common and has a wide 

 range. Saussure and Agassiz collected specimens on 

 the summits of the Alps. 



