108 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
11. Ramalina reticulata (Noehd.) Kremp. 
Pale green, compressed, pendulous in festoons from limbs of trees, often 1 meter in 
length or even more, ramifying, the lacinize smooth or furrowed, lacunose and fenes- 
trate, forming an extensive network; apothecia marginal and lateral, sessile; disk 
concave to flat and the thalline margin then obsolete; epithecium subcontinuous, 
yellowish; paraphyses coherent; hypothecium colorless; spores 8, 14 to 18 » long, 4 to 
7 » wide, oblong, straight or slightly curved, bilocular; spermogones numerous in the 
dilated fronds as small protuberances of the color of the thallus; sterigma straight or a 
little curved and fastigiate as it were; spermatia short, straight, 4 to 6 » long; KHO 
giving no reaction. 
Frequent in canyons along the coast. 
12. Ramalina evernioides Nyl. 
Thallus compressed, suberect or subpendulous, both surfaces flattened, reticulate- 
lacunose, smoother above, from a broad base soon dividing into lacinie, these irregu- 
larly sinuate and laciniate in the upper part, the lacinie often marginally sorediate- 
torn, 1 to 2.75 cm. high, the cortical hyphe perpendicular to the thalline axis, beneath 
the cortex the well developed layer of longitudinal hyphz containing the gonidia; 
fruiting plants hitherto not found. 
On shrubs at Point Loma, near San Diego, and also at Newport, Orange County. 
USNEA (Dill.) Adans. 
Thallus fruticulose, filamentose, erect or pendent, often much elongated, terete, 
branching, smooth or the cortex beset with tubercles or short diverging fibrille; 
apothecia circular, the lecanorine margin often ciliate; spores acicular to fusiform. 
KEY TO SPECIES. 
Thallus erect. 
Grayish green, bearded...............--20--- ee ee cece eee eeeee 1. U. hirta. 
Reddish, bearded................. 2.00.22. 2 cece eee eee eee eee ee 2. U. rubiginea. 
Thallus pendulous. 
Cortex fibrillose. 
Densely short-fibrillose..................---2-20.2220000- 3. U. ceratina. 
Loosely short-fibrillose.................--2-0-.---2----2+---- 4. U. dasypoga. 
Cortex not fibrillose, fissured transversely ; amooth. . we ceeeeeeeeeee 5. U. articulata. 
1. Usnea hirta (L.) Hoffm. 
Thallus erect, cespitose, dull grayish green or light green, hardly above 3 cm. high, 
much branched and thickly bearded with short fibrils, sorediate; always sterile. 
Common on fences and bushes of the foothills and ascending the mountains. At 
Del Mar on twigs; Santa Catalina Island, Trask. 
2. Usnea rubiginea (Michx.) Herre, Proc. Washington Acad. Sci. 7: 343. 1906. 
Usnea florida rubiginea Michx. Fl. Bor. Amer, 2: 332. 1803. 
Very similar to U. hirta and also sterile, but reddish-colored. Of the same distribu- 
tion and habitat, but less frequent. 
3. Usnea ceratina Ach. 
Thallus dusky yellowish green, pendulous, elongated, shortly and more or less 
densely fibrillose, except at the extremely attenuate terminations, but these, as 
throughout, besprinkled with small soredia; sterile. 
On shrubs, Santa Catalina Island, Trask; Santa Cruz Mountains in fruit, Herre. Not 
common with us. 
4. Usnea dasypoga (Ach.) Nyl. 
Similar to U. ceratina, but less stout and sparingly beset with fibrillee: and soredia, 
pendent, attaining a length of 20 cm.; also sterile. 
On shrubs in the San Gabriel Range. 
