86 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Spores compound. 
Bilocular. 
Thallus gray or brown.................020.02000-. LEcANIA (p. 95). 
Thallus not gray or brown. 
Yellow; disk bright-colored................... CANDELARIELLA (p. 99). 
Not yellow; disk blackish to black............ PLACOLECANIA (p. 98). 
Muriform-multilocular ..............00...0...2.0.2.2.. PuHLYcTIs (p. 98). 
HARPIDIUM Koerb. 
Thallus crustaceous, uniform, areolate; apothecia subinnate, circular, with a thal- 
line margin, a proper margin not apparent; hypothecium pallid; paraphyses not 
branching, septate; asci 8-spored, the spores colorless, simple, crescent-shaped, the 
epispore thin; spermogones immersed; sterigma simple, straight; spermatia short, 
oblong-ellipsoid. 
Within our limits only one species. 
1. Harpidium glaucophanum Ny]. 
Lecanora glaucophana Nyl.; Hasse, Lich. South. Calif. 11, 1898. 
Thallus of dispersed, white, lobulate and lobed squamules, 2 to 4.5 mm. in width, 
dark beneath, affixed centrally to the substrate, KHO+-yellow, Ca(ClO),—; apothecia 
innate, 1 or 2 in a squamule, 0.5 to 1.5 mm. wide; disk flat, papillate, level with or 
barely protruding above the thalline surface, reddish brown, becoming black in the 
herbarium; epithecium subcontinuous, rich reddish brown; thecium colorless, 60 
high, with iodine blue, the color of the epithecium unchanged; paraphyses adglut- 
inate; hypothecium ofa faint yellowish tint; asci inflated-clavate;sporessimple, broadly 
fusiform crescent shaped, rarely several straight, 11 to 16 » long, 8 to 4 # thick. 
On gneiss and other crystalline rocks. Type locality at Camp Baldy, San Antonio 
Canyon in the San Gabriel Range, at 1,600 meters altitude. 
Type deposited with Dr. W. Nylander; duplicates with W. W. Calkins, in the 
herbarium of the New York Botanical Garden, and in herb. Hasse. 
LECANORA Ach. 
Thallus crustaceous, uniform, lobed at the periphery or squamulose, rarely fruti- 
culose; gonidia Protococcus algze (Cystococcus Naeg.); apothecia permanently innate 
or sessile, bordered by a thalline margin; parathecium (proper exciple) mostly not 
well developed; paraphyses not branching; hypothecium pallid or colored; spores 
normally 8, rarely in multiples of the normal, 16 or 32, colorless, ellipsoid or oblong 
to globular, straight or bean-shaped, thin-walled; spermatia staff-shaped to acicular, 
straight or curved. 
KEY TO SECTIONS, 
Apothecia permanently immersed; spores large; thallus crusta- 
ceous, uniform......2222. 2.00.00 0020 0.2 eee ee 1. ASPICILIA, 
Apothecia sessile, 
Thallus crustaceous, uniformly areolate to warty .............. 2, EULECANORA. 
Thallus crustaceous to squamulate in the center and lobed 
more or less at the periphery ..................22....... 3. PLacopium. 
