HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 121 
to 50 p long, 12 » thick; spores smoky gray to brown, 11 to 16 » long, 7 to 8 p thick, 
ellipsoid, the septum and epispore thick, not constricted, slightly paler at center of 
each loculus. 
On trap rock, Topanga Canyon, Santa Monica Range; at Del Mar on quartz; head 
of Bright Angel Trail, Grand Canyon, Arizona. From the Rocky Mountain Region 
westward. ’ 
8. Buellia stellulata (Taylor) Mudd. 
Thallus whitish, thin, forming a finely rimose-areolate crust, the areoles flat or 
lightly convex, with a black encircling hypothallus; apothecia very small, scarcely 
0.5 mm. in width; disk black, flat with a black proper margin, becoming immarginate; 
epithecium subcontinuous, brown; paraphyses loose, septate, brown capitate; hypo- 
thecium lighter brown than the epithecium; asci clavate; thecium blue with iodine, 
about 72 » high; spores ellipsoid, both ends obtuse, bilocular, slightly constricted, 
10 to 12 » long, 4 to 5 » thick, smoky gray to brown; medulla not stained by iodine. 
On rocks: San Diego, Orcutt; Santa Monica Range and northward. Distributed 
through the eastern United States; cosmopolitan. 
9. Buellia myriocarpa (Lam. & DC.) Mudd. 
Thallus whitish, gray to grayish green, thin, indeterminate, pulverulent, or obsolete; 
apothecia small, about 0.25 mm. wide; disk flat, becoming convex, black, the proper 
margin concolorous, thin, soon obsolete; epithecium brownish black; thecium color- 
less, 44 to 48 » high; paraphyses strict with brown, capitate tips; hypothecium brown 
black; asci clavate; spores 8, oblong-ellipsoid, smoky gray to brown, not constricted, 
bilocular, 12 to 16 » long, 4 to 8 p» thick; sterigma branched, articulate, spermatia 
staff-shaped and narrow-fusiform, tapering at each end, 4 to 8 pt long, slightly exceeding 
1 » in thickness. 
Common on barks, wood, and stones. It varies somewhat as to thallus and size of 
apothecia, hence several forms are described of which we have: Forma punctiformis 
(Hoffm.) Mudd, with the thallus indistinct, light gray, the apothecia minute—on 
siliceous pebbles and conglomerate, Cahuenga Pass, Santa Monica Range; forma 
chloropolia (Fries) T. Fries, with the thallus granulose, dark gray when dry, greenish 
when moistened, the apothecia very minute—on bark of Cercocarpus betulaefolius, 
Santa Monica Range; and forma ecrustacea Leight., the thallus absent, the apothecia 
small—on trap rock, Topanga Canyon, Santa Monica Range. 
10. Buellia parasema (Ach.) Koerb. 
Thallus light gray or with a faint yellowish tint, minutely squamulose, ‘‘chinky,”’ 
surrounded by a thin, black hypothalline border, KHO+ citrine yellow, then gradu- 
ally greenish; apothecia sessile, from 0.25 to 1 mm. wide; disk black, flat to convex, 
the thin, black proper margin finally disappearing; epi thecium subgranulose, brown, 
thin; thecium 56 to 76 u high, colorless or in places light brownish rays extending 
upward from the hypothecium; paraphyses clavate with a brownish capitate top and 
jointed above; hypothecium dark brown, thick; asci inflated-clavate; spores 8, 
ellipsoid-oblong, brown, bilocular, 16 to 20 # long, 6 to 8.5 » thick, with a smoky grayish 
spot in each loculus, but in fully matured spores the loculi uniform brown, the spores 
slightly or not constricted, straight or somewhat obliquely curved; spermatia straight, 
narrowly fusiform, 4 to 8 » long, about 1 y# thick. 
On various smooth barks and dead wood. A common, cosmopolitan species and 
quite variable, but of the forms of authors only the following variety has been found 
with us: 
10a. Buellia parasema vulgata T. Fries. 
Described as having a smoother thallus, the black hypothalline border indistinct 
or wanting; apothecia small, punctiform, barely 0.5 mm. wide, epithecium sub- 
