64 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO SPECIES. 
Substratum earth. 
Thallus of convex squamules, 
Squamules brown, wrinkled.................2.-.-.-.-. 9. A. obpailens. 
Squamules whitish, furfuraceous. 
Spores globular or subglobular, 4 to“ indiameter. 7. A. pleistospora. 
Sporesglobular or subglobular, 10to13 in diameter. 8. A. pleiospora. 
Thallus squamules not convex, flat. 
Greenish yellow................00.0..0.00 002 cee ee eee eee 3. A. schleicheri. 
Whitish............ cece eee e eee eee ee eee eee eee 6. A. reagens. 
Substratum rock. 
Squamules some shade of yellow. 
Citrine yellow................0000.0.0020e cece ee ee eee 1. A. chlorophana. 
Greenish yellow...............0....0.0.202020.02-000- 2. A. xanthophana. 
Squamules some color other than yellow. 
Squamules brown. 
Squamules wrinkled............... cece eee ee eeeee 9. A. obpallens. 
Squamules not wrinkled. 
Disk not punctiform, becoming dilated....... 12. A. fuscata. 
Disk punctiform, immersed. 
Squamules dark beneath................. ll. A. rufescens. 
Squamules pallid beneath................ 10. A. squamulosa. 
Squamules light-colored. 
Squamules ochroleucous. 
Disk small, pruinose, the squamules flat..... 13. A. aeruginosa. 
Disk not pruinose, the squamules semiglobular 14. A. glebosa. 
Squamules white or whitish. 
Deeply fissured, ivory whitish........... Le eeee 4, A, 
Not deeply fissured, more or less blackish 
suffused........2.2.--22.220222-22.-000. 5. A. 
peltasticta. 
epilutescens. 
1, Acarospora chlorophana (Wahl.) Mass. 
Thallus citrine yellow, closely adherent to substratum by medullary hyphae, rimose- 
areolate in the center, the areole flattened-globose, radiate at the circumference, 
turgid, contiguous, dilating outward and at the periphery deeply lobed, hypothallus 
indistinct, KHO=, Ca(ClO),=; apothecia immersed, from punctiform to 0.5 mm. 
wide; disk flat to convex, light gamboge yellow; proper margin hidden by the thalline 
margin; epithecium continuous, sulphur yellow; thecium colorless, 60 to 80 fe high; 
paraphyses lax-coherent, slightly thickened at the yellow tips, not jointed or branched; 
hypothecium colorless; asci inflated-clavate, membrane thickened at top, 60 to 80 
long, 20 to 26» thick; spores numerous and minute, ellipsoid, 3 to 4.5 p long, approxi- 
mately 1 to 1.5 thick; hymenial gelatine with iodine blue, except the epithecium, 
this not stained. 
Throughout the mountains of southern California above 1,600 meters altitude, on 
granite and gneiss; San Bernardino Mountains, Parish; San Gabriel and San Jacinto 
Mountains. 
2. Acarospora xanthophana (Nyl.) Fink, Contr. U.S. Nat. Herb. 14: 170. 1910. 
Lecanora xanthophana Nyl. Ann. Sci. Nat. IV. Bot. 15: 379. 1861. 
Crust greenish yellow, closely adherent, of turgid, flattish squamules, discrete or 
contiguous, lobed, rounded or angular from juxtaposition, from 0.5 to 2 mm. wide; 
apothecia innate, generally single in the squamules; disk punctiform to enlarged, flat, 
sordid brownish and blackening, the thalline margin entire or crenulate; epithecium 
pale yellowish; thecium 120 to 140 » high; paraphyses not or slightly thickened at the 
tips, not colored; hypothecium colorless; asci saccate, 120 # long, 28 # thick; spores 
minute and numerous, 4 to 6 » long, 2 # thick; enial gelatine with iodine pale blue. 
