340 
THE PLANT PHYLA 
Order DiscoLicHENES. Disk Lichens. Lichen-forming 
fungi with asci in apothecia. 
Family 2. Lecanactidaceae; 3, Pilocarpaceae; 4, 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
Family 
12. 
13. 
14. 
15. 
18, 
19. 
21. 
22. 
23. 
24. 
25. 
26. 
27. 
Chrysothricaceae; 5, Thelotrema- 
taceae; 6, Diploschistaceae; 7, Ecto- 
lechiaceae; 8, Gyalectaceae; 9, Coe- 
nogoniaceae; 10, Lecidiaceae; 11, 
Phyllopsoraceae. 
Cladoniaceae. Crustaceous to scaly or 
foliose, with Protococcus hosts 
(rarely Myxophyceae hosts).—Beo- 
myces, Cladonia, Stereocaulon. 
Gyrophoraceae. Foliose, coriaceous, with 
Protococcus hosts.—Umbilicaria. 
Acarosporaceae. Crustaceous, scaly or 
foliose, with Protococcus hosts—The- 
locarpon, Acarospora. 
Ephebaceae; 16, Pyrenopsidaceae; 17, 
Lichinaceae. 
Collemataceae. Gelatinous to crusta- 
ceous, scaly foliose to fruticose, with 
Nostoe hosts.—Physma, Collema, 
Leptogium. 
Heppiaceae; 20, Pannariaceae. 
Stictaceae. Foliose, with Palmella or 
Nostoc hosts.—Sticta, Lobaria. 
Peltigeraceae. Foliose with Palmella or 
Nostoc hosts.—Peltigera. 
Pertusariaceae. Crustaceous, with Pro- 
tococcus hosts.—Pertusaria. 
Lecanoraceae. Crustaceous, with Pro- 
tococcus hosts.—Lecanora. 
Parmeliaceae. Foliose, with Protococ- 
cus hosts.—Parmelia. 
Usneaceae. Fruticose, with Protococcus 
hosts.—Usnea, Ramalina. 
Caloplaceae. Crustaceous, with Proto- 
coccus hosts.—Caloplaca. 
28.—Theloschistaceae. Foliose to fruticose, 
with Protococcus hosts.—Thelo- 
schistes. 
