20 ‘CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
8. Arthonia stictella Stizenb. 
Arthonia stictella Stizenb.; Hasse, Bull. South. Calif, Acad. 2: 34. 1903, nomen 
nudum. 
Thallus epiphlceodal, sordid whitish, subfurfuraceous; apothecia parallel, lirellate, 
black; thecium about 60 # high, pallid; paraphyses intricate, indistinct; asci pyri- 
form with a thick membrane, especially above, 60 4 long, 20 p thick; spores in 8’s, 
colorless, oblong, finger-shaped, both ends rounded, 6-locular, the loculi somewhat 
lenticular, 20 to 26 » long, 6 to 7 » thick; iodine staining the epithecium deep blue 
and the hymenial gelatine deep orange red; spermogones not seen, 
On bark of Lonicera subspicata, Santa Catalina Island. Type in herb, Haase, 
9. Arthonia pruinosella Nyl.; Hasse, Lich. South. Calif, 16. 1898. . 
Thallus thick, epiphleodal, white to pale cream color, of roundish patches 1.5 
cm. or less wide, furfuraceous; spermatia straight, staff-shaped, 8 to 10 4 long, 1 p 
thick; apothecia numerous, small, about 0.1 mm. wide, flat, round, black or mostly 
white pruinose; epithecium granulose, dark ashy gray; paraphyses indistinct; asci 
oblong-ovoid, 28 to 36 4 long, 12 to 16 # thick, the membrane thick especially above; 
spores in 8’s, oblong-ellipsoid, bilocular, not constricted, the epispore thin, 13 to 16 
#t long, 4 to 5 » thick; hymenial gelatine with iodine pale vinous red, the contents of 
the asci yellowish. 
On bark of Cordia sp., a small South American tree cultivated at the Agricultural 
Experiment Station near Santa Monica. 
Type deposited with the late Dr. W. Nylander; duplicates in the U.S. National 
Herbarium, with Dr. A. Zahlbruckner, and in herb. Hasso. 
10. Arthonia diffusa Nyl. 
Thallus white, finely granulose or furfuraceous, epiphloeodal, diffuse; apothecia 
small (about 0.2 mm. wide), black, when moistened yellow gray and semitranslucent; 
epithecium granulose, gray, after iodine bluish gray; thecium colorless, 50 to 54 yt 
high; asci pyriform, 36 to 44 » long, 14 to 18 » thick, the upper part thickened; spores 
4-locular, ovoid-oblong, 13 to 16 # long, 3.5 to 4.5 # thick; hymenial gelatine pale 
claret with iodine, the spores yellow. 
On Malvastrum fasciculatum, in canyons of the Santa Monica Mountains, 
11. Arthonia subdiffusa Willey. 
Thallus whitish, thin, in small round or oblong maculz, 1 to 2 cm. wide, with 
KHO reddish yellow, with Ca(ClO), unchanged; apothecia very minute, round or 
oblong, slightly projecting, black, flat, quite densely pruinose, very similar in appear- 
ance to those of Allarthonia patellulata caesiocarpa Zahlbr., the latter, however, round 
and convex; epithecium graphite color, subgranulose; thecium colorless, 40 to 44 tt 
high; hypothecium colorless; paraphyses distinct; asci oblong-ovoid, 40 “long, 20 2 
thick; spores in 8’s, narrowly oblong-ovoid, 4-locular, the loculi equal, attenuate at 
one end, 16 to 18 » long, 4 to 5 » thick; hymenial gelatine with iodine pale vinous 
red, the spores yellow. 
On Malvastrum fasciculatum in the Santa Monica Mountains. 
12. Arthonia punctiformis Ach. 
Thallus hypophleodal, effuse, gray to dull reddish brown; apothecia black, plano- 
convex, round or oblong; asci ovoid-oblong, 48 # long, 20 » thick; spores in 8’s, 4- 
locular, oblong-ellipsoid, 22 to 24 long, 7 to 8 # thick, rounded at each end, nar- 
rowed at one end; reaction with iodine a dark vinous red. 
On various smooth barks, widely distributed; Santa ‘Cruz Mountains, Herre, San 
Bernardino, Parish; frequent in the Santa Monica Mountains, 
13. Arthonia epipastoides Nyl. 
Thallus epiphlcodal, silvery white, somewhat furfuraceous or minutely scaly, 
effuse; apothecia minute, punctiform, irregularly roundish or angular, impressed; 
