74 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM, 
KEY TO SPECIES. 
Substratum bark; lobes ascending, foliaceous, the upper surface 
beset with lobules..............-.-.----200-- 022 eee ee eee 2. DL. burgessit. 
Substratum rock and earth. 
Thallus crustaceous-granulose............0. eee eee eee ..... 7. DL. rhyparodes. 
Not crustaceous. 
Lobulate. 
Lobes club-shaped.............0-...02 eee cece eee 1. L. plicatile. 
Lobes not club-shaped. 
Foliaceous. 
Minute...........-- 2-22-22 e eee ee eee eee eee 5. L. tenuissimum. 
Larger. 
Palmately lobed..................-.----------- 6. L. palmatum. 
Not palmately lobed. 
Laciniate-lobed...............--.2...005- 3. L. californicum. 
Deeply lacero-laciniate..............-.--- 4. L. lacerum. 
1. Leptogium plicatile (Ach.) Nyl. 
Thallus small, orbicular, cartilaginous, deeply lobed, the narrow central lobes 
ascending; apothecia sessile at the apices of the crowded lobes; disk dull brownish, 
remaining long concave, the proper margin entire, thick, somewhat lighter colored; 
epithecium amber color, gradually paling downward; thecium colorless, about 140 y 
high; paraphyses adglutinated; hypothecium dull yellow brown, darker than the 
epithecium; asci oblong-cylindric, about equaling the thecium in height; spores 
ovoid-ellipsoid, submuriform, 4-locular with several longitudinal septations of the 
loculi, 16 to 32 p» long, 8 to 14 » thick; hymenial gelatine deep blue with iodine. 
Thallus with a small-celled pseudoparenchymatous cortex, and the medullary ‘ 
hyphe narrow. 
On calcareous tufa in the Santa Monica Range. 
2. Leptogium burgessii (Lightf.) Mont. 
Thallus forming purplish brown cushions from 1 to 2 cm. wide, foliaceous and lobed, 
the lobes imbricated, rounded and sinuate, the upper surface closely beset with erect, 
oblong lobules, the lower intricately rugulose, pale; apothecia minute, 1 to 1.5 mm. 
wide, surrounded by a laciniate thalline margin; disk concave, with an entire proper 
margin, both concolorous with the thallus; thecium 140 to 180 » high; asci oblong- 
cylindric, 120 long, 16 to 18 » thick; spores ellipsoid, apiculate at each end, muri- 
form, 32 » long, 16 # thick. 
: On bark. Collected in Lower California by T. 8. Brandegee and deposited in the 
“Herbarium of the California Academy of Sciences at San Francisco. Previous to the 
destruction of that herbarium by the catastrophe of April 18, 1906, the writer, through 
the kindness of the curator, Miss Alice Eastwood, was given the opportunity of exam- 
ining the lichens of the Academy, and from a fragment retained by permission this 
description is taken. The species may be found in our district. 
3. Leptogium californicum Tuck. 
Thallus dark brown, sinuate, laciniate-lobed, the lobes from 1 to 1.5 cm. in length, 
short and imbricated in the center, the lobules more coarsely lacerated than in L. pal- 
matum, the upper and lower surfaces finely reticulate-wrinkled; apothecia sessile, 
small, 0.2 to 0.75 mm. wide, the disk convex and with the entire margin concolorous 
with the thallus; epithecium colorless; thecium colorless, about 140 » high; paraphyses 
septate, simple, entire, clavate at the tips; hypothecium colorless, thin; spores 
6-locular, ellipsoid and submuriform, 24 to 44 # long, 7 to 13 » thick. 
Among moss on rocks, near Mayfield, Herre; Santa Monica and San Gabriel Ranges 
and doubtless throughout the State. 
