119. Lecidea] 33. LECIDEACEAE 191 



C. Apothecia rarely less than 0.5 mm. across 

 D. Disk flat to convex, smooth 



E. Apothecia dark reddish or nearly black 21. L. furfuracea 



E. Apothecia reddish brown to dark purplish . . . 20. L. rufofusca 



D. Disk slightly convex, irregular and furrowed, appearing as many 



conglomerate apothecia 18. L. congesta 



B. Hypothecium hyaline to brownish or pale brown 

 C. On trees and old wood 



D. Thallus greenish or bright yellow or brownish 



E. Thallus greenish yellow to brownish 23. L. quernea 



E. Thallus yellowish green or sulphur-colored . . . . 22. L. cadubriae 



D. Thallus greenish gray to brownish 24. L. carnulenta 



C. On rocks, soil, over moss and rarely on wood 



D. Disk pale flesh-colored to black; spores 13-23 X 7—13 /a 27. L. coarctata 

 D. Disk flesh-colored to olive-green or black ; 



spores 9-16 X 4.5-5 m • • • 26. L. granulosa 



D. Disk flesh-colored to yellowish brown ; 



spores 5-7 X 2.5-3 /x 25. L. intropallida 



B. Hypothecium reddish or brownish to dark brown or black 

 C. Thallus greenish gray to ashy or black 

 D. Spores rarely more than 12 /j. in length 



E. Thallus chinky-areolate to wrinkled and granulose 



F. Disk pale brownish to black 31. L. turgidula 



F. Disk bright or dull red 32. L. russula 



E. Thallus obscurely rough and becoming smooth and 



disappearing 29. L. peliaspis 



D. Spores rarely less than 12 n in length 

 E. On trees, soil, moss, or old wood 



F. Spores 9-20 X 3.5-6 /t 34. L. sanguineoatra 



F. Spores 12-16 X 6-8 fi 30. L. furfurosa 



E. On rocks 28. L. calcivora 



C. Thallus greenish gray to more or less brownish or darker 

 D. Thallus chinky-areolate to granulose 



E. Apothecia rarely more than 0.4 mm. across 



F. Thallus olive-green to blackish brown 36. L. uliginosa 



F. Thallus greenish to yellowish brown . . . . 35. L. flavidolivens 



E. Apothecia 0.5-1.2 mm. across 33. L. hypomela 



D. Thallus subgranulose to squamulose 37. L. parvifolia 



A. Apothecia reddish brown or brown to black, rarely pruinose 

 B. Hypothecium hyaline 



C. Thallus soon disappearing 



D. On old wood 38. L. myriocarpella 



D. On rocks 40. L. plana 



C. Thallus usually persistent 



D. Thallus greenish gray to ashy, whitish or yellowish 

 E. Black hypothallus more or less conspicuous 

 F. Thallus more or less yellowish 



G. Apothecia 0.2-0.7 mm. across 46. L. tessellina 



G. Apothecia 0.7-1 .8 mm. across 47. L. amylacea 



F. Thallus greenish gray to ashy or whitish, but not yellowish 

 G. On rocks 



H. Exciple thick, becoming wavy . . . . 44. L. tennessensis 

 H. Exciple thin, finally curled-flexuous . . . . 45. L. cyanea 



G. On trees 42. L. fuscescens 



E. Black hypothallus rarely conspicuous 

 F. On rocks and soil 



G. Thallus greenish gray to dirty yellowish . . .41. L. Brandegei 



G. Thallus ashy to whitish 43. L. subplebeia 



F. On old wood 39. L. melancheima 



D. Thallus pale to dark green or blackening 



E. Thallus chinky to areolate 48. L. tenebrosa 



E. Thallus of erect crowded trunks 49. L. Pringlei 



