— 93 — 
CC. Thallus well-developed, podetia short, squamulose, decorticate 
between the squamules .C. didyma. 
AA. Podetia cup-bearing. 
B. Podetia medium-sized (mostly 2 cm. or less). 
C. Podetia white-powdery-sorediate, cup with incurved margins, 
commonly proliferating C. digitata. 
CC. Podetia warty or granulate-sorediate, cups dilated, rarely 
proliferating C. coccif era. 
BB. Podetia elongated (mostly 4 cm. or over), yellowish. 
C. Podetia sulphur-powdery, never squamulose C. deformis. 
CC. Podetia smooth and densely squamulose C bellidiflora. 
Series 2. Apothecia brown. 
A. Podetia cylindrical, without cups. 
B. Podetia simple or nearly so, primary thallus usually persistent. 
C. Podetia absent or thickly squamulose. 
D. Podetia absent or nearly so, squamules coarse. 
C. caespiticia. 
DD. Podetia evidently present, squamules fine, often sorediate. 
E. Podetia short (i cm. or less) C delicata. 
EE. Podetia taller (2 cm. or more), C. decorticata. 
CC. Podetia present and with few squamules or none. 
D. Corticate, without soredia or granules. 
E. Cortex continuous or nearly so. 
F. Podetia short (mostly less than 2 cm.). 
G. Squamules fine, podetia slender in proportion to the 
apothecia C. mitrula. 
GG. Squamules coarse, podetia stouter. 
H. Typically simple, KOH+ (red) C. subcariosa. 
HH. Branched above, KOH — . ... C. cariosa v. corticata. 
FF. Podetia elongated (over 3 cm.). 
G. Slender, little inflated C gracilis v. chordalis. 
GG. Stout, much inflated C. gracilis v. elo?igata. 
EE. Cortex fissured, irregular and uneven C cariosa. 
DD. More or less decorticate, sorediate, or granulate. 
E. Scurfy-granulate C. pityrea. 
EE. Powdery-sorediate. 
F. Podetia perforate, gray C. glauca. 
FF. Podetia not perforate. 
G. Podetia whitish throughout. 
