HASSE—-LICHEN FLORA OF SOUTHERN CALIFORNIA. 19 
ened at apex, 32 to 44 » long, 14 to 16 « thick; spores in 8’s, oblong-ellipsoid, 4-locular, 
not constricted, the upper loculus largest, the others equal in length, one end blunt, 
the other attenuated, 13 to 16 p long, 5 to 5.2 4 thick; paraphyses absent; hymenial 
gelatine with iodine stained a coppery red. 
On bark of apricot and oleander, Soldiers’ Home grounds (near Santa Monica). 
5. Arthonia rhoidis Zahlbr. Beih. Bot. Centralbl. 18: 156. 1902. 
Thallus thin, effuse, pale pinkish; apothecia immersed, black, slightly pruinose, 
from punctiform to irregularly roundish or oblong; epithecium granulose, blackish 
with a bluish tinge; paraphyses coherent and interwoven; thecium 56 to 60 » high, 
colorless; hypothecium pallid; asci 40 to 46 » long, 12 to 18 4 thick; spores in 8’s, 
oblong-ellipsoid, 3-locular, the two septa approximate near the middle of the spore, 
13 to 14 » long, 5 to 6 g thick; hymenial gelatine and spore sacs with iodine a violet 
blue, the contents of the latter and the spores yellow to orange. 
Type locality, Santa Catalina Island on bark of Rhus laurina. Type deposited 
with Dr. A. Zahlbruckner; duplicates in the U.S. National Herbarium and in herb. 
Hasse. 
The writer has subsequently found this species on Grevillea robusta on the Soldiers’ 
Home grounds and on Salix lasiolepis and Platanus racemosa in canyons of the Santa 
Monica Range. The thallus of the mainland form is whitish and smoother than the 
insular type, but spore measurements and chemical reaction are identical. 
6. Arthonia tetramera (Stizenb.). 
Arthonia dispersa tetramera Stizenb.; Hasse, Bull. South. Calif. Acad. 2: 35. 1903. 
Thallus silvery white, thin, subfarinaceous, limited bya thin, black border; apothe- 
cia with a delicate, spurious thalline margin, linear and variously branching, numerous; 
epithecium finely granulose, bluish black; thecium 64 to 68 « high, colorless; para- 
physes indistinct; asci pyriform, 28 to 32 long, 12 to 16 » thick; spores in 8’s, oblong- 
ellipsoid, attenuate at one end, 4-locular, not constricted, the epispore thin, 11 to 14 « 
long, 4 to 5 « thick; hymenial gelatine with iodine blue, soon dark orange red; spermo- 
gones not seen. 
On Lonicera subspicata, Santa Catalina Island. Type specimen in herb. Hasse. 
”. Arthonia radiata (Pers.) Ach. 
Thallus mostly whitish to light gray, rarely pale cream or flesh color, consisting of 
smooth, indeterminate, irregular roundish patches from 3 to 4 or more centimeters in 
diameter; apothecia black, flat, appressed, more or less radiately lobed or divided; 
asci pyriform; spores in 8’s, 4-locular, oblong-ellipsoid, 14 to 18 y long, 5 to 7 4 thick; 
hymenial gelatine with iodine blue, then vinous red, the asci and spores yellow. 
On various barks, common. Cosmopolitan. 
Ya. Arthonia radiata angustata Wain. 
Apothecia linear, simple or branching, the thallus limited by a black hypothalline 
line; measurements and reactions as in the species. 
On caudex of Leptosyne gigantea, on San Nicolas Island, Trask; on the smooth bark 
of Quercus agrifolia and Heteromeles arbutifolia in the Santa Monica Mountains. 
7b. Arthonia radiata swartziana (Ach.) Willey. 
Thallus whitish to gray, similar to the species; apothecia dull black and black, 
roundish, less distinctly radiate and more crowded, flat; epithecium granulose, dark 
gray; thecium colorless or sordid, 68 to 80 » high; paraphyses indistinct; hypothecium 
pallid or grayish; asci pyriform, the membrane much thickened above, 44 to 60 z 
long, 22 to 24 » thick; spores oblong-ovoid, 4-locular, blunt at the ends, 16 to 20 # 
long, 7 » thick, with a halo; hymenial gelatine with iodine blue—including the 
hymenial structures (the spores yellow or pale orange). 
On various barks, like the species widely distributed in southern California but less 
frequent. 
