HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA, 87 
KEY TO SPECIES. 
Section 1. ASPICILIA T. Fries. 
Substratum earth; thallus dull greenish gray, lobate at border... 5. L. glaucopsina, 
Substratum rock. 
Thallus disappearing. .....-.....----2.----2220- 22002222 6. L. praecrenata. 
Thallus present, some shade of gray. 
Disk pruinose.........2....2-0-2 200-222 e eee eee eee 1. L. calcarea. 
Disk not pruinose, black. 
Thallus gray, more or less warty. 
With KHO no reaction.............2...2.-.--- 3. DL. gibbosa. 
With KHO-+red..........-..-----2.-.-.--.-. 2. DL. cinerea. 
Thallus not warty, smoothish.................... 4, L. laevata. 
Section 2. EULECANORA Wain. 
Substratum rock. 
Thallus obsolete; disk brownish..........-........--+-+--+- 17. L. polytropa. 
Thallus present. 
Apothecia small; disk grayish to brownish............ 10. L. hagent. 
Apothecia larger. 
Disk naked, black. 
Apothecia internally black................... 7. DL. atra, 
Apothecia internally pale................-..- 12. L. cotlocarpa, 
Disk with some kind of covering. 
Disk with a bloom, dull yellowish to light 
brown ......--------------------------- 4. DL. cenisia. 
Disk densely pruinose. 
Pruinose throughout. ..............--.-- 11. DL. sordida. 
Not pruinose throughout, the proper mar- 
gin black............2...-2.-.---. lla. L. sordida bi- 
eincta, 
Substratum bark (rarely rock). 
Thallus absent or disappearing. 
Disk grayish flesh-colored to dull black..............-- 18a. L. symmicta sae- 
pincola, 
Disk buff to pale brown, biatorine...............----- léa. Z. varia illu- 
sora. 
Thallus present. 
Brown, the disk dark..........--.--.---- eee eee ee eee 19. L. phaeobola. 
Of some color other than brown. 
Thallus white to grayish. 
Apothecia large. 
Disk black, naked, internally pale....... 12. L. coilocarpa. 
oe) Disk brown.....----------------+-----+--- 8. L. subfusea, 
Apothecia small. 
Disk naked. 
Dark brown..........----00002 20020 13. L. allophana. 
Pale brown..........--..------------ 8a. L. subfusca dis- 
tans, 
Disk not naked. 
Disk with a delicate bloom. 
Buff color and darkening......... 9. L. pacifica. 
Light grayish...............---- 10. L. hagent. 
Disk coarsely pruinose...........-.--- 15. ZL, albella, 
Thallus pale greenish yellow. 
Disk pale buff with a bloom................. 16, L. varia, 
Disk rusty brown, biatorine -.... wees eeeeeee 18. L. symmicta. 
