63 

 KOH f yellow. 



10. C. macilenta 



These three species, together with C. didyma (listed in the earlier paper, 

 but not here, although it may extend into northern New England), look 

 much alike on casual observation, and often grow together, in the club 

 range. C. macilenta is definitely distinguishable, even if the other charac- 

 ters are doubtful, by the instant yellow reaction with KOH. C. didyma has 

 a less brilliant yellow reaction, but is distinguishable from C. macilenta 

 by its usually lower and stouter form. C. bacillaris and C. Floerkeana are 

 distinguishable by their taller, slenderer form, and absence of KOH re- 

 action, as between each other they are sometimes doubtfully separable, 

 and some lichenists question if they are separate species. 



b. Stramineo-Flavidae Yainio. Primary squamules yellowish-green above, 

 white or yellowish beneath, podetia yellowish-green. 

 Podetia cup-forming, sterile or fertile, (CaCl) KOH + pale yellow. Cortex 

 persistent, not sorediate. 



11. C. coccifera 



Cortex distintegrating, usually sorediate, KOH — . Apothecia often rather 

 large and conspicuous. 



12. C. plenrota 



Cortex persistent below, disintegrating above, cups with many sharp- 

 pointed marginal divisions, usually incurved, with small apothecia on 

 tips KOH+ yellow. (PI. 1, f. 3.) 



13. C. digitata 



Cortex continuous or rimose (chinky), lower part sometimes squamulose, 

 cortex often yellow-sorediate, margins of cups often irregularly dentate 

 or proliferate, podetia tallest of our red fruited Cladoniae, sometimes over 

 three inches under favorable conditions in the north. KOH — . (PI. 1, f . 5.) 



14. C. deformis 



Podetia not cup-forming, always terminated by apothecia; cortex con- 

 tinuous or areolately dispersed, or absent, KOH — . Plants not sorediate; 

 podetia variously branched in several different forms, decorticate areas 

 whitish, arachnoid. (PI. 1, f. 4.) 



15. C. cristatella 



Plants more or less sorediate, podetia simple, club-shaped, decorticate 

 areas naked; in one form the podetia are densely squamulose and soredi- 

 ate and apothecia degenerate in size or wanting. KOH — . 



16. C. incrassata 



Series B. Ochrophaeae. Yainio. Apothecia brown to flesh color, 

 a. Unciales. (Del) Yainio. Primary thallus foliose, disappearing, seen only in 

 young plants. Podetia not persistent at base, cylindrical to irregularly 

 swollen, usually corticate, never squamulose, becoming much branched 



