HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 1 
hypothecium colorless; asci ovoid, 40 # long, 20 4 thick, the membrane thickened 
above; spores in 8’s, oblanceolate, 2 or 3-locular, or mostly 4-locular, 20 to 40 » long, 
6 to7 # thick, straight or lightly curved, one end long-attenuate; asci with iodine 
pale violet, the spores yellow. 
On California holly, walnut, and Rhus laurina, in canyons of the Santa Monica 
Mountains. 
14. Arthonia impolita (Ehrh.) Borr. 
Thallus white to silvery gray, effuse, moderately thick, pulverulent, KHO—, 
Ca(Cl1O).+red; apothecia numerous, at times confluent, flesh-colored to light reddish 
brown, subinnate and sessile, flat, roundish, oblong, or even lobulate to wavy in 
outline, with a thin spurious thalline margin, somewhat pruinose, when moist tumid 
and light yellowish brown; epithecium yellowish gray or brownish and granulose; 
thecium colorless, 48 to 52 4 high; paraphyses indistinct; hypothecium colorless; asci 
wedge-shaped, 44 u long, 24 » thick, the membrane thickened above; spores colorless, 
oblong-ovoid, 13 to 20 p» long, 5.5 to 8 # thick, 4 to 5-locular, the extreme loculi slightly 
larger than the central; reaction with iodine blue, including the epithecium and 
hypothecium, changing to red brown, the ascus protoplasm and spores yellow. 
Santa Catalina Island on California holly and walnut bark; on various barks on the 
mainland, Santa Monica Mountains; on shrubs at Newport and White Point near 
San Pedro. 
14a. Arthonia impolita chiodectonoides Tuck. 
Thallus white, creamy, furfuraceous, in rounded patches, 1.5 to 6.5 cm. wide, 
without a limiting black hypothallus; no reaction with iodine; apothecia small, 
roundish, often several congregated, dark flesh-colored, densely pruinose or covered 
by thallus; epithecium light yellowish gray, not granulose; thecium colorless, 40 to 
48 » high; asci cuneate, 36 to 40 » long, 16 to 20 # thick, the membrane thickened 
above; spores in 8’s, oblong-ovoid to oblong-ellipsoid, colorless, 4 or 5-locular, the 
end loculi slightly larger than the others. 
Near Newport on the cortex of dead Opuntia; on shrubs at White Point near San 
Pedro. 
In view of the differing reaction this might rank as a species. 
15. Arthonia lecanactidea Zahlbr. Beih. Bot. Centralbl. 13: 155. 1902. 
Thallus creamy white, epiphlceodal, effuse, medium thick, finely rimose; apothecia 
numerous, often crowded, dull black, planoconvex, slightly raised above the thallus, 
from 0.3 to 0.5 mm. wide; epithecium subgranulose, brownish dark gray; thecium 76 
to 80 » high, colorless; paraphyses coherent, intricately interwoven; hypothecium 
pallid; asci cuneate, 52 p long, 16 p thick, the upper part thickened; spores in 8’s, 
bilocular, oblong, the lower cell slightly attenuate, 10 to 14 p long, 3.5 to 4 » thick; 
hymenial gelatine with iodine pale violaceous, the spores light orange. 
On Lycium californicum. Type locality, bluffs at White Point near San Pedro. 
Also collected on Santa Catalina Island on the same substrate, at the isthmus. 
Type deposited with Dr. A. Zahlbruckner; duplicate in herb. Hasse. 
16. Arthonia gyalectoides Muell. Arg. 
Thallus white, furfuraceous, slightly roughened or granular, effuse; apothecia 0.5 
to 0.8 mm. wide, flesh-colored, flat or concave, roundish, somewhat flexuose in outline 
or quite irregular, white pruinose, appressed, surrounded by a slightly raised false 
thalline margin, the moistened disk paler and translucent; thecium colorless; epithe- 
cium granulose; thecium with epithecium 60 » high; hypothecium pallid, paraphyses 
indistinct; asci pyriform to balloon-shaped, about 36 # long, 24 » thick, the mem- 
brane thickened above; spores in 8’s, ovoid-oblong, rounded at both ends, attenuate 
toward one end, 5-locular, the upper loculus the larger, 16 to 22 « long, 7 to 8 # thick; 
