94 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
ference, affixed centrally by a short pedicel; apothecia sessile and adnate-sessile, 
usually crowded in the center; disk light buff to reddish buff, mostly concave with a 
prominent, persistent, entire to sinuate and crenulate thalline margin; epithecium 
granulose, pale yellow, with KHO darkening to yellowish brown; thecium 52 » high, 
yellowish orange; paraphyses coherent; hypothecium orange, paling from the center 
outward; asci inflated-clavate; spores 8, ovoid, 7 to 12 » long, 4.5 to 6 » thick. 
On granitic rocks in the higher mountains. San Bernardino Mountains, Parish; 
San Gabriel, San Jacinto, and Tehachapi Ranges. 
21a. Lecanora rubina opaca (Ach.) Fries. 
Thallus greenish yellow, pediculately affixed as in the species, but less markedly 
foliose at the margin; disk black. 
Of same habitat and distribution as the species. San Bernardino Mountains at 
3,400 meters, Parish; in the San Jacinto Mountains at a similar elevation. 
22. Lecanora marginalis Hasse, Bryologist 18: 112. 1910. 
Thallus monophyllous, white and finely white-pruinose above, roundish or flexuose 
in outline, 0.75 to 1.5 cm. in diameter, at the center about 0.5 mm. thick, but increas- 
ing somewhat toward the circumference, umbilicately attached at the center to the 
substratum; upper surface smooth or rugulose-warty and at the periphery becoming 
convolutely folded, beneath tawny flesh-colored, destitute of rhizine; upper cortex 
composed of several layers of perpendicularly arranged brown cells, bleaching with 
KHO, beneath this the gonidial layer, the subtending medulla with horizontal, 
delicate, closely interwoven hyphe about J : thick, the inferior cortex showing several 
layers of large round cells; thallus with KHO+yellow, Ca(ClO),=; apothecia adnate, 
all marginal, a few to each frond or when more, crowded and deformed from pressure, 
1.5 mm. to less in diameter, the periphery of the frond often revolute and the apo- 
thecia facing toward the substratum; disk black, thickly pruinose, rarely naked, 
concave to flattish and wavy, the turgid thalline margin coarctate, flexuose, and 
often deformed by juxtaposition; epithecium subcontinuous, dull brownish black; 
thecium colorless or light ochraceous, 48 to 52 » high; paraphyses stout, 2 thick, 
coherent, separating after action of KHO, scarcely thickened above; hypothecium of 
coarse cells and of the same hue with the epithecium; asci clavate and inflated- 
clavate, 48 « high, 10 to 22 » thick, 8-spored; spores globular, 8 » in diameter, to 
ovoid-ellipsoid, 9 to 14 # long, 6.5 to 8.5 » thick, the epispore thin; all hymenial strue- 
tures staining deep blue with iodine; KHO bleaching the epithecium a pale steel 
blue; gonidia bright green, 12 to 28 » in diameter; spermogones indicated by generally 
numerous, minute black dots, immersed, globular; spermatia acicular, curved, 32 to 
40 » long, hardly | » thick; sterigma simple, straight, attenuate above. 
On shaded lava and basaltic rocks near Little Lake Station, Inyo County, at 1,000 
meters altitude. From its color a conspicuous lichen; occurring on the lower side of 
inclined dark volcanic rocks. 
23. Lecanora pinguis Tuck. 
Thallus light sulphur yellow, closely adherent, mealy, at the center indistinctly 
rimose-areolate and turgid-convolute, conspicuously radiate at the periphery, the 
radii contiguous, paling, flattening and dilated at the border, the hypothallus pallid; 
thallus with KHO-+yellow, Ca(ClO),+-bright orange, forming round patches from 
2 to 4.5 cm. in diameter; apothecia sessile, centrally crowded; disk concolorous 
with the thallus, concave or flat, appearing almost urceolate from the turgid, some- 
what coarctate, sinuous thallipe margin; epithecium continuous, sordid yellowish 
light brown; thecium 68 to 72 high, light yellow; paraphyses strict, slender, com- 
pacted, not thickened above; hypothecium yellow, about equaling the thecium in 
height; asci clavate; spores oblong-ellipsoid, 11 to 15 » long, 4 to 5.8 thick; hymenial 
structures blue with iodine, with KHO yellow; spermogones not seen. 
On sandstone near San Diego, Orcutt. 
