LICHENS OF THE STATE OF WASHINGTON 127 



G. Black margin and black underside, very conspicuous, lobes 



lax, often sharp pointed 6. P. vittata 



G. Black margin not conspicuous, lobes shorter, tips rounded 

 ventricose. 

 H. Lobes rugose, twisted, and crowded, very broad. 



2. P. enteromorpha f. rugosa 

 H. Lobes not rugose, twisted, and crowded, medium width. 



L P. enteromorpha 

 F. Lobes only slightly inflated, irregularly branching, tips usually 

 ascending, black spermagonia not abundant. 



L Not always sorediate 4. P. physodes 



L Always sorediate, lobes shaped much like a trumpet, open 



and filled with soredia 5. P. tuhulosa 



C. Always bearing rhizoids below. 



J. Some shade of real brown, often olive-brown. 



K. Apothecia always numerous, asci more than 8-spored. 



16. P. multispora 



K. Apothecia not always numerous, asci never more than 8-spored. 

 L. Marginal lobes rimose-reticulate, center thickly beset with 

 coralloid branchlets. 

 M. Below light colored, color of medulla unchanged with P. 



17. P. rudecta 



M. Below dark colored, medulla red with P. 



19. P. saxatilis var. Aizoni 



L. Not as above. 



N. Bearing coralloid branchlets or powdery soredia. 



O. Lobes narrow, always longer than wide, usually on rocks. 



1 1 . P. prolixa 

 O. Lobes broad, always wider than long, usually on wood. 



9. P. olivacea var. aspidota 

 N. Never bearing coralloid branchlets, isidia, or soredia. 



P. Lobes narrow, crowded, imbricated... 10. P. pannariiformis 

 P. Lobes broad, always wider than long, not imbricated. 



8. P. olivacea 



J. Some color other than brown. 

 Q. Reticulate-rimose. 



R. Conspicuously sorediate on the reticulations ; also often on the 



margins 20. P. sulcata 



R. Rarely if ever sorediate. 



S. Very sparingly isidiose 18. P. saxatilis 



S. Very densely isidiose. 



T. Below light colored, color of medulla unchanged with P. 



17. P. rudecta 



T. Below dark colored, medulla red with P. 



19. P. saxatilis var. Aisoni 



Q. Never reticulate-rimose. 



U. Margins bearing clustered sorediate lobules. 



