340 



THE PLANT PHTiXA 



Order Discolichenes. Disk Lichens. Lichen-forming 

 fungi with asci in apothecia. 



Famil}^ 2. Lecanactidaceae; 3, Pilocarpaceae; 4, 

 Chrysothricaceae; 5, Thelotrema- 

 taceae; 6, Diploschistaceae; 7, Ecto- 

 lechiaceae; 8, G^-alectaceae; 9, Coe- 

 nogoniaccae; 10, Lecidiaceae; 11, 

 Phyllopsoraceae. 



Family 12. Cladoniaceae. Crustaceous to scaly or 

 foliose, with Protococcus hosts 

 (rarely Myxophyceae hosts). — Beo- 

 myces, Cladonia, Stereocaulon. 



Family 13. Gyrophoraceae. Foliose, coriaceous, with 

 Protococcus hosts. — Umbilicaria. 



Family 14. Acarosporaceae. Crustaceous, scaly or 

 foliose, with Protococcus hosts — The- 

 locarpon, Acarospora. 



Family 15. Ephebaceae; 16, Pyrenopsidaceae; 17, 

 Lichinaceae. 



18. Collemataceae. Gelatinous to crusta- 

 ceous, scaly foliose to fruticose, with 

 Nostoc hosts. — Physma, Collema, 

 Leptogium. 



19. Heppiaceae; 20, Pannariaceae. 

 21. Stictaceae. Fohose, with Palmella or 



Nostoc hosts. — Sticta, Lobaria. 



Family 22. Peltigeraceae. Foliose with Palmella or 

 Nostoc hosts. — Peltigera. 



Family 23. Pertusariaceae. Crustaceous, with Pro- 

 tococcus hosts. — Pertusaria. 



Family 24. Lecanoraceae. Crustaceous, with Pro- 

 tococcus hosts. — Lecanora. 



Family 25. Parmeliaceae. Foliose, with Protococ- 

 cus hosts. — Parmelia. 



Family 2G. Usneaceae. Fruticose, with Protococcus 

 hosts. — Usnea, Ramalina. 



Family 27. Caloplaceae. Crustaceous, with Proto- 

 coccus hosts. — Caloplaca. 



Family 28. — Theloschistaceae. Foliose to fruticose, 

 with Protococcus hosts. — Thelo- 

 schistes. 



Family 



Family 

 Family 



