104 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Thallus fruticulose, dark. 
Compressed throughout. .................... 20022 e eee eee eee ee 4. C. saepincola. 
Branches subterete. ........... 000002. 20 cc eee eee eee eee eeee 3. C. californica. 
1. Cetraria juniperina (L.) Ach. 
Thallus a rich chrome yellow, foliaceous, erect or suberect, about 0.5 cm. high, the 
lobes longitudinally furrowed and slightly lacunose, lacerate at the edges; apothecia 
adnate, submarginate on the upper surface; disk brown, concave, shining; thalline 
margin persistent, crenulate; epithecium yellowish brown, sharply defined below; 
thecium 52 to 56 » high, the upper part pale yellowish tinted; paraphyses adglutinate, 
ill defined, with small yellow heads; hypothecium colorless; asci oblong-clavate, the 
membrane thickened above; spores 8, ovoid-ellipsoid, 8 to 9 zlong, 4.5 to 5.5 » thick; 
hymenial gelatine blue with iodine, soon changing to brownish, a narrow hyaline 
border of the epithecium remaining unaffected. 
On barks. Monterey Bay, Herre; dead limbs of conifers at Wauwona, in the Sierra 
Nevada. Throughout the eastern United States to arctic America; Europe. 
2. Cetraria lacunosa Ach. 
Thallus foliaceous, grayish green, lacunose-rugulose, deeply parted from the base, 
the lobes subascending, dilated outward and the border lacerate-laciniate, beneath 
whitish, in places blackening; apothecia terminal; disk brown, at last planoconvex 
and rugulose; thalline margin thin, entire; epithecium continuous, pallid flesh-colored 
or pale brown, paling below; thecium 48 to 50 # high; paraphyses loosely adglutinate; 
hypothecium colorless; asci clavate; spores 8, ovoid-ellipsoid, 8 to 8.5 pt long, 4.5 to 
5 thick; thallus with KHO=; hymenial gelatine with iodine pale blue, soon green- 
ish, then sordid brown; spermatia ellipsoid, 3 to 4 » long, 1 « thick. 
On pines, Squirrel Inn, San Bernardino Mountains, Reed. 
3. Cetraria californica Tuck.! 
Thallus fruticulose, suberect and erect, greenish brown to almost black, paler 
beneath, the lobes terete-compressed, lacunose and longitudinally. furrowed, soon 
intricately branching up to the finely lacerate termination; apothecia terminal and 
subterminal, 2 to 5 mm. wide, subpedicellate; disk concave to planoconvex, con- 
colorous with the thallus; thalline margin thin, crenulate and finally almost obsolete; 
epithecium continuous, a thin brown band; thecium 80 high, pallid, staining blue 
with iodine, except the epithecial border (20 » wide), this not affected; paraphyses 
coherent; hypothecium colorless; asci inflated-clavate, with iodine darker blue than 
the other parts; spores 8, ellipsoid, 10 to 11 « long, 4.5 to 5 x thick; blue stain gradually 
changing to light brown, after KHO the paraphyses appearing indistinctly septate. 
On living or dead shrubs and limbs of trees, preferably conifers. Rare in the Santa 
Monica Range, but frequent in the higher ranges. 
4. Cetraria saepincola (Ehrh.) Ach. 
Thallus grayish green to almost black, suberect to erect, 0.5 to 0.75 cm. high, irregu- 
larly laciniate-lobate, paler beneath, KHO—, Ca(Cl0),—; apothecia adnate, marginal 
and lateral; disk concave to flat, green black to black, glistening as if varnished ; 
thalline margin entire, persistent; epithecium continuous, brownish yellowish, 
paling downward; thecium 36 to 40 # high, colorless below; paraphyses adglutinated ; 
hypothecium of a paler hue than the epithecium; asci clavate; spores 8, 9 to 12 p 
long, 6 to 8 # thick; with iodine the epithecium not stained, the other thecial structures 
blue. 
'Dr. R. Heber Howe, jr., in his Classification de la Famille des Usneaceae dans 
VAmérique du Nord (p. 20, Paris, 1912) transposes Cetraria californica to the genus 
Coelocaulon Link as Coelocaulon californicum (Tuck.) Howe. 
