66 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
above the thallus, 1 to 1.5 mm. in diameter; disk flat, papillate, dark blackish red, 
when moistened dark brick red and the thallus gray, a raised, crenulate, thalline rim 
forming a spurious margin; epithecium continuous, brick red to brownish red, gradu- 
ally paling downward; thecium pallid sordid yellowish, about 130 « high; paraphyses 
adglutinated, coarse, not well defined, slightly thickened at the yellowish tips; 
hypothecium pale amber color; asci oblong-ellipsoid, reaching to the epithecium; 
spores numerous, globular, 5 to 6 » thick; hymenial gelatine handsome blue with 
iodine, the epithecium remaining unchanged; with KHO no reaction. 
On sandy earth near Palm Springs at eastern base of the San Jacinto Mountains (the 
type locality). 
Type deposited with Dr. A. Zahlbruckner; duplicate in herb. Hasse. 
7. Acarospora pleistospora (Nyl.). 
Lecanora pleistospora Nyl.; Hasse, Bull. Torrey Club 24: 446, 1897. 
Thallus of sordid white to ash gray, entire, subglobular squamules, generally 
crowded, 1.5 to 1.75 mm. wide, the apex coarsely pruinose and forming a white 
somewhat coarctate thalline margin, the thallus KHO—, Ca(ClO),—; apothecium 
solitary, immersed in the squamule, 0.3 to 0.75 mm. wide; disk concave, round, dark 
brown black; epithecium continuous, yellowish brown to brown; thecium colorless, 
120 to 140 yw high; paraphyses slender, loosely coherent, not thickened at apices; 
hypothecium thin, pale amber color; asci ventricose, equaling the thecium in height; 
spores globular, numerous, 24 or more, 4 to 6 « in diameter; hymenial gelatine with 
iodine blue, the yellowish epithecium remaining unchanged; no change with KHO. 
On earth. Type locality, the foothills near the Soldiers’ Home, Santa Monica; 
Verdugo Mountains, near Los Angeles. 
Type deposited with Doctor Nylander; duplicate in herb. Hasse. 
8. Acarospora pleiospora (Nyl.). 
Lecanora pleiospora Nyl.; Hasse, Bull. Torrey Club 27: 446. 1897. 
Thallus crustaceous, of sordid white to light gray, round, subglobular squamules, dis- 
persed, 1.5 to 1.75 mm. in width, with coarse scaly pruina, attached to substratum 
by medullary hyphe, KHO—, Ca(ClO),—; apothecia single in squamules, immersed, 
0.3 to 0.75 mm. in width; disk concave, dark brown to black, the thalline margin 
somewhat coarctate; epithecium continuous, sordid yellowish; thecium 300 » high, 
sordid pallid; paraphyses slender, subcoherent, containing numerous minute globules, 
conglutinated at the apices; hypothecium pale sordid yellow; asci saccate, 240 # long, 
48 » thick; spores globular, 10 to 13 « in diameter; hymenial gelatine with iodine blue, 
then reddish brown; spermogones not seen. 
On earth. Type locality in the San Gabriel Range, at 700 meters altitude, along 
the ‘‘New Trail” to Mount Wilson. In external appearance this is very similar to the 
last preceding species, differing in the size of the spores. 
Type deposited with Doctor Nylander; duplicates in the United States National 
Herbarium and in herb. Hasse. 
9. Acarospora obpallens (Nyl.) Zahlbr. Beih. Bot. Centralbl. 18: 161. 1902. 
Lecanora obpallens Nyl. Act. Soc. Sci. Fenn. 26: 31. 1890. 
Thallus of discrete or crowded squamules, light chestnut, shining, slightly rugulose 
and pitted, convex, round, from 1 to 1.8 mm. wide; apothecia solitary in squamules, 
from primarily almost punctiform to 0.5 and 0.75 mm. in diameter; disk concave to 
flat, reddish brown, papillate, naked or slightly pruinose, with a thin, entire, per- 
sistent thalline margin; epithecium subcontinuous, pale yellowish brown to brown; 
thecium pallid; hypothecium pallid; paraphyses slender, coherent at the globular 
brown tips; asci inflated-clavate, extending up to the epithecium, the membrane 
thick, especially above; spores minute and numerous, oblong, 4 to 7 # long, 1 1 or less 
than 2 » thick; hymenial gelatin blue with iodine, turning vinous red, no change 
with KHO or NO. 
