42 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
18a. Lecidea enteroleuca theioplaca Tuck. 
Thallus of minute pale yellow verruce, mostly congregated, a black hypothallus 
distinctly seen, KHO+ yellow, Ca(ClO),+ light red; apothecia, etc., as in the 
species. . 
On slaty rock, Santa Monica Mountains. 
18b. Lecidea enteroleuca aequata (Floerke) Tuck. 
Thallus white or whitish ash-colored, irregularly and interruptedly rimose-areolate, 
KHO+ distinctly yellow, Ca(ClO),—; epithecium bluish black, with KHO turning 
violet; hypothecium pale fuscous. 
On calcareous rock, Santa Monica Mountains; on granite, Tehachapi Mountains at 
1,700 meters altitude. 
18c. Lecidea enteroleuca pilularis (Davies?) T. Fries. 
Crust whitish and faintly ash-colored, verruculose and areolate-verruculose; apo- 
thecia adnate, small; disk flat with a thin, erect, black proper margin, later becoming 
convex and immarginate; epithecium subcontinuous, bluish; paraphyses loose; 
hypothecium pallid; asci clavate and inflated-clavate; spermatia arcuate. 
Sandstone, Topanga Canyon, Santa Monica Mountains. 
19. Lecidea goniophila (Floerke) Schaer. 
Crust thin, granulose, ash-colored, often almost disappearing, KHO+ yellow, 
Ca(ClO),-+ pale red; apothecia adnate, small, 0.25 to 0.75 mm. wide; disk black, pri- 
marily somewhat concave, the proper margin subturgid with a dark brown dash, finally 
planoconvex and the margin obsolete; epithecium pale bluish gray; thecium 100 pz 
high, colorless; paraphyses slender, loosely coherent; asci oblong about 12 to 16 p 
shorter than the thecium; spores in 8’s, oblong, ovoid-ellipsoid, one end often 
abruptly attenuate 16 to 20 » long, 7 to 9 » thick; spermatia ‘‘straight,’’ not seen in 
our specimen. 
On sandstone, Fatijo Ranch, Santa Cruz Mountains, Herre; northern base of the 
San Gabriel Range, at Shoemakers Ranch, Big Rock Creek, 1,500 meters altitude. 
England and continental Europe. 
20. Lecidea euphorea (Floerke) Nyl. 
Thallus pale greenish grayish, effuse, smooth, epiphleodal, KHO+ yellow, 
Ca(ClO),—; apothecia sessile, dispersed, small, 0.25 to 0.8 mm. wide, light colored 
internally, the disk brownish black, at first plane with a concolorous, prominent 
margin, this becoming obsolete and the disk planoconvex; epithecium colorless; the- 
cium colorless; paraphyses free, not thickened at the apices; hypothecium colorless or 
with a faint yellowish tint; asci ventricose; spores in 8’s, broadly ellipsoid, 11 to 16 
# long, 6 to 8 » thick; hymenial gelatine with iodine blue, soon yellowish brown; 
spermatia acicular, arcuate. (Determined by Doctor Nylander.) 
On Umbellularia californica, in canyons of the San Gabriel Range, Los Angeles 
County; on the same bark in the Santa Cruz Peninsula, Herre. Europe. Not here- 
tofore reported from North America. 
21. Lecidea tessellata Floerke. 
Crust pale gray, areolate-rimose, the areole flat or somewhat concave, angular, 
determinate, a dark hypothalline border observable, KHO—; apothecia numerous, 
crowded, in places contiguous, imbedded in or slightly raised above the thallus, 
dark, dull black, flat; faintly pruinose, the margin thin, subpersistent; paraphyses 
subcoherent, with bluish black apices, these with KHO changing to brown; thecium 
sordid, colorless, about 56 » high; hypothecium faintly colored; asci subventricose; 
spores in 8’s, 9 to 11 » long, 5 to 6 » thick. 
On granite, San Jacinto Mountains at 2,300 meters altitude; in the Santa Cruz 
Mountains at altitudes varying from 170 to 1,000 meters, Herre. 
