52 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
6. Bacidia rubella (Hoffm.) Mass. 
Crust pale gray to pale greenish ash color, thin, effuse, granulose; apothecia sessile, 
small, 0.25 to 1 mm. in diameter; disk flat, finally convex and from fawn color to 
blackish purple, the margin at first delicately pruinose (which is forma porriginosa 
(Turn.) Arn.), later naked, (forma luteola (Schrad.) T. Fries); epithecium continuous, 
colorless, 72 to 80 4 high; paraphyses coherent, slightly thickened above but colorless; 
hypothecium colorless; asci clavate, 68 » long, 12 » thick; spores acicular, one end 
finely attenuate, 48 to 68 » long, 2 to 3 w thick, indistinctly plurilocular, straight or 
slightly curved; thecium, epithecium, and hypothecium blue with iodine; thallus 
KHO—. . 
On living barks, Santa Monica Range. North America and Europe. 
7. Bacidia clementis Hasse, Bryologist 13: 61. 1910. 
Thallus crust moderately thick, whitish, coarsely granular and rugulose, becoming 
chinky, KHO—, Ca(ClO),—; apothecia sessile, small, 0.2 to 0.8 mm. in width; disk 
flat, brown black, the proper margin entire, concolorous, soon becoming convex, 
black and the margin obsolete; epithecium colorless, granulose; thecium colorless 
to pale brown at the periphery; paraphyses not coherent, not thickened nor col- 
ored at the apices; asci clavate to subcylindric; 68 to 112 » high, 12 to 16 4 
thick, the membrane not at all or slightly thickened at the top in the larger 
sacks; spores cylindric, 60 to 80 p long, 4 to 5 ». thick, both ends equally bluntly 
rounded without attenuation, once or twice gently curved, 15 to 17-locular; hymenial 
gelatine giving no reaction with iodine, only the asci becoming yellow, the juvenile, 
immature ones darker, the escaped spores not staining with iodine; hypothecium 
yellowish gray to brown; spermogones minute black protrusions on the thallus; 
sterigma straight, simple; spermatia acicular, straight or slightly curved, 10 to 12 » long. 
On bark of Heteromeles arbutifolia, San Clemente Island, T'rask in 1893. In 1903 
collected on the same bark in the Santa Ynez Canyon of the Santa Monica Range. 
Type deposited in herb. Hasse. 
This species is near Bacidia fuscorubella, with which it was at first confounded, but 
differs in the length of its spores and in its chemical reactions. 
8. Bacidia endoleuca (Nyl.) Kickx. 
Crust thin, granulate, effuse, greenish gray; apothecia sessile, scattered, 0.25 to 
1 mm. wide; disk brown black to black, marginate, flat to convex, the margin not 
quite disappearing; epithecium subcontinuous, umber brown and gray, gradually 
paling downward; thecium colorless, 52 to 80 » high; paraphyses loosely coherent, 
clavate at the tips; hypothecium pale yellowish; asci clavate; spores acicular, 
slightly thicker at upper end, gradually attenuate at the other, multiseptate, 28 to 60 p 
long, 1 to 4.5 x thick; hymenial gelatine with iodine blue, turning dingy brown; epi- 
thecium and hypothecium not stained by iodine. 
On various barks; ‘‘Mission Ridge” at Santa Barbara, Herre; canyons of San Gabriel 
Range, Los Angeles County. Southern North America to South America; Europe; 
Japan. 
9. Bacidia albescens (Arnold) Zwackh. 
Crust thin, effuse, silver gray to ash color, pulverulent and granular; apothecia 
minute to small, up to 0.6 mm. wide, sessile, scattered; disk flattish, marginate to 
more convex and immarginate, from light pink to flesh color; epithecium subcon- 
tinuous, light yellowish brown paling downward, becoming light grayish brown at the 
periphery; thecium 60 # high, colorless; paraphyses coherent, clavate at apices; 
hypothecium colorless; asci clavate, 48 to 52 » long, 8 to 10 # thick; spores acicular, 
slender, one end slightly thickened, the other attenuate, 28 to 44 u long, 2 « thick 
pluriseptate; hymenial gelatine blue with iodine, including the epithecium and 
hypothecium. 
