1909] Riddle,— Key to Cladonia in New England 213 
BB. Podetia elongated (mostly 4 em. 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 (1 em. or 1езз)............ .C. delicata 
EE. Podetia taller (2 cm. or more). ........- ‚ С. 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. у cse nn nnn mitrula 
GG. Squamules coarse, podetia stouter. 
Н. Typically simple, KOH + (red). ..C. subcariosa 
HH. Branched above, KOH —. . .C. cariosa v. corticata 
FF. Podetia elongated (over 3 em.) 
G. Slender, little inflated. .. . .. . . C. gracilis v. chordalis 
GG. Stout, much inflated. ........ C. gracilis v. elongata 
EE. Cortex fissured, irregular and uneven........ . C. cariosa 
DD. More or less decorticate, sorediate, or granulate. 
E. Seurfy-granulate...... een n n n ‚С. pityrea 
EE. Powdery-sorediate. 
Е. Podetia perforate, ртау.................. C. glauca 
FF. Podetia not perforate. 
G. Podetia whitish throughout. 
H. Simple, 2 em. high or less. . C. fimbriata у. coniocrea 
HH. Sparingly branched, 3 em. high or more 
C. fimbriata v. subulata 
GG. Podetia brown below........ sees 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. 3 
Е. With few squamules or none. 
G. Podetia more or less erect, in loose masses. 
Н. Podetia wholly ртау................ C. furcata 
HH. Brown, especially above. . .C. furcata v. palamaea 
GG. Podetia intricately intertangled in dense masses 
C. rangiformis 
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. rangiferina 
EE. Ultimate branches more erect, tips acute. 
F. Loosely branched, in irregular masses. . . ‚С. sylvatica 
FF. Intricately branched, in dense rounded tufts 
C. alpestris 
