Irpdcx 



TO THE 



GENERA OF LICHENS. 



[The references are to the serial number, not to the page]. 



Acolium, 31. 

 Arthonia, 30. 

 Biatora, 23. 

 Buellia, 26. 

 Calicium, 32. 

 Cetraria, 2. 

 Cladonia, 22. 

 Collema, 16. 

 Endocarpon, 33. 

 Evernia, 3. 

 Graphis, 29. 

 Heppia, 14. 

 Heterothecium, 24. 

 Lecanactis, 27. 

 Lecanora, 19. 

 Lecidea, 25. 

 Leptogium, 17. 

 Nephroma, 12. 



Opegrapha, 28. 

 Pannaria, 15. 

 Parmelia, 6. 

 Peltigera, 13. 

 Pertusaria, 21. 

 Physcia, 7. 

 Placodium, 18. 

 Pyrenula, 37. 

 Pyxme,8. 

 Ramalina, 1. 

 Rinodinia, 20. 

 Sagedia, 35. 

 Sticta, 11. 

 Theloschistes, 5. 

 Trypethelium, 31. 

 Umbilicaria, 10. 

 Usnea, 4. 

 Verrucaria, 30. 



