THE DETEllMT]SrATIO:^r OF LICIT E\S IN THE FIELD 25 



Thalline granules large (almost sqiianiules), 



bright greenish-yellow with citrine soredia. Lecanora epanora. 

 Th. a citrine-yeilow or yellowish-green 



powder ". Lecidea lucida. 



Sterile plants without such characters not 



usu. determinable (y). 



19. Th. of small egg-yellow granules Candelariella vitellina. 



Th. of an eif use greenish-yellow powder. 



Calicium hyperellum (y). 

 Sterile plants Avithout such characters not 

 usually determinable (h). 



20. On trees or pales. Th. yellowish-green 



(often pale), K+ yellow 21. 



On rocks. Th. K-f yellow, at length orange- 

 red. Kare plants -. 22. 



On ground. Th. greenish (K+ yellow). Icmadophila aeruginosa. 



21. Th.;usu. pale and very powdeiy (L. symmic- 



tera is similar and also a fairly common 



plaut) Lecanora conizaea. 



Th. forming a more continuous crust Lecanora varia. 



22. Very rare alpine plant with bright yellow th. Buellia alpicola. 

 Th. yellowish -white, thin, cracked areolate, 



smooth. (Also see Lecidea lacfea.) ... Leranora subcarnea. 



23. On ground, often encrusting decaying mosses 



or other vegetative debris 24. 



On trees or old wood 28. 



On rocks 33. 



24. Th. having a reddish coloration with C. 



Frequent 25. 



Th. without a reddish coloration with C. 



On ground. Common 27. 



25. Medulla blue with I. Th. greyish K — , on 



mosses or lichens Diploschistes bryophilus. 



Medulla not blue with I. Th. K+ yellowish. 26. 



26. Usu. on peaty ground. Th. usu. whitish, 



granulate or ix)wdery Lecidea granulosa. 



Usu. encrusting mosses. Th. usu. grey or 



darker, granulate or powdery Bilimbia lignaria. 



Usu. encrusting mosses. Th. greyish and 



+ spinulose or verrucose Lecanora tartarea ( /) . 



27. Th. of greyish (or greenish) minute granules, 



K-f yellow Baeomyces rufus. 



Th. of small pinkish (or whitish) granules, 



K + faint yellow B. roseus. 



Th. of dark minute granules, K — . Common 



on peaty ground Lecidea uliginosa. 



Sterile plants without such characters usu. 



not determinable. 



28. Th. reddish or orange with C 29. 



Th. not reddish or orange with C 31. 



