110 LICHENS OF THE STATE OF WASHINGTON 



E. Disk greenish gray or black. 



24. L. rubina var. melanophthalma 



E. Disk yellow, fawn color, or reddish brown 23. L. rubina 



C. Thallus subfoliose, marginally lobed. 



F. Loosely attached to the substratum 20. L. melanaspis 



F. Closely attached to the substratum 21. L. muralis 



A. On rock, bark, old wood, or moss ; crustose, neither squamulose, sub- 

 foliose, nor marginally lobed. 

 B. Apothecia adnate or sessile, disk flat to convex (Eulecanora). 

 C. On bark, old wood, or moss, 

 D. Disk pruinose. 



E. Thallus never areolate, yellow then brick red with KOH. 



13. L. pallida 



E. Thallus often areolate, yellow with KOH 12. L. pacifica 



D. Disk not pruinose. 



F. Apothecia reddish brown or black. 



G. Hymenium and hypothecium brown or blackish 8. L. atra 



G. Hymenium and hypothecium not brown or blackish. 



H. Apothecium not crowded, thalline margin prominent, al- 

 ways on bark 17. L. subfusca var. argentata 



H. Apothecia crowded, thalline margin not always promi- 

 nent, not always on bark 16. L. subfusca 



F. Apothecia pale yellow, buff, reddish brown, or rarely black. 

 I. Thallus white or greenish gray, no color change with KOH. 



10. L. Hageni 

 I. Thallus white or pale yellow. 



J. Only on old wood, near the ocean, thallus yellow then 



orange with KOH 18. L. symmicta 



J. On bark, old wood, or moss, thallus yellow with KOH. 



19. L. varia 

 C. On rock. 



K. Thallus absent 14. L. polytropa 



K. Thallus present. 



L. Disk pruinose 15. L. rupicola 



L. Disk not pruinose. 



M. Apothecia reddish or black. 



N. Alga Gloeocapsa and Protococcus 9. L. granatina 



N. Alga Protococcus. 



O. Hymenium and hypothecium black 8. L. atra 



O. Hymenium and hypothecium not black. 



P. Apothecia crowded, usually irregular in shape ; 



thallus sparse 16. L. subfusca 



P. Apothecia not crowded, usually circular ; thallus 

 abundant, areoles often centrally stalked. 



11. L. or eg ana 

 M. Apothecia pale yellow, buff, or very rarely black. 



Q. Thallus white or greenish gray, no color change with 



