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H. Simple, 2 cm. high or less . . C. fimbriata v.coniocrea. 
HH. Sparingly branched, 3 cm. high or more. 
C. fimbriata v. subulata. 
GG. Podetia brown below C. cornuta. 
BB. Podetia repeatedly branched and forming more or less intricate 
masses, thallus mostly disappearing. 
C. Podetia corticate, smooth, squamules when present coarse. 
D. Yellowish-green, tips fastigiate, blunt C. uncialis. 
DD. Grayish or brownish-green, tips dichotomous, acute. 
E. Cortex continuous, without soredia. 
F. With few squamules or none. 
G. Podetia more or less erect, in loose masses. 
H. Podetia wholly gray C. furcata. 
HH. Brown, especially above. . . C. furcata y. palamaea. 
GG. Podetia intricately intertangled in dense masses. 
C. rangiforniis. 
FF. More or less covered with coarse squamules. 
C. furcata v. pinnata. 
EE. Cortex broken in places, and sorediate especially above. 
C, furcata v. scabriuscula ^ 
CC. Podetia decorticate, squamules when present fine. 
D. Podetia without squamules. 
E. Ultimate branches recurved, tips blunt. . . C. rangiferira. 
EE. Ultimate branches more erect, tips acute. 
F. Loosely branched, in irregular masses C. syivatica^ 
FF. Intricately branched, in dense rounded tufts. 
C alpestris. 
DD. Podetia covered with fine squamules. 
C. squamosa v. muricella. 
AA. Podetia cup-bearing, often proliferating (i. e. branching from 
the margins of the cup). 
B. Cups perforate. 
C. Without soredia. 
D. With scattered coarse squamules or none. 
E. Podetia smooth. 
F. Slightly inflated, cups narrow , . .C. crispata. 
FF. Much inflated, cups spreading, often becoming leafy. 
C. turgida. 
