92 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
hymenial gelatine with iodine blue, soon vinous red, the spores becoming pale yellow; 
thallus with KHO—, Ca(C1O),-++red, 
Santa Catalina Island on California holly and walnut; canyon of Santa Monica 
Mountains on Quercus agrifolia. 
17. Arthonia polygramma Ny]. 
Thallus white, thin, effuse, subfurfuraceous, KHO+ yellow, then reddish, 
Ca(ClO),—; apothecia brown, innate, flat or slightly concave, pruinose, irregularly 
round or oblong in outline, deeply radiately incised (as seen better when moist, the 
pruina then transparent), and reddish brown ; epithecium granulose, yellowish gray; 
thecium about 60 » high, colorless to a pale brownish hue; hypothecium brownish 
yellow; asci balloon-shaped, the membrane thickened above; spores in 6’s (?), ovoid- 
oblong, rounded at both ends, 5 or 6-locular, 16 to 23 # long, 6 to 8 u thick, the 
epispore thick, the end cells, especially the upper, larger than the middle ones; 
paraphyses indistinct; hymenial gelatine with iodine a rich reddish brown. 
Santa Catalina Island on Rhus diversiloba; on oak bark, Santa Cruz Mountains, 
Herve. 
ALLARTHONIA Nyl. 
Thallus with Palmella gonidia; otherwise as in Arthonia. 
1. Allarthonia patellulata (Nyl.) Zahlbr, in Engl. & Prantl. Nat. Pflanzenfam. 
1'*; 91. 1907. 
Arthonia patellulata Nyl. in Nya Bot. Notis. 1853: 95. 1853. 
Thallus pale cream color, effuse, continuous, epiphleodal; apothecia round or 
slightly oblong, black, small, appressed or slightly projecting; asci ovoid or oblong- 
ovoid, 32 to 36 u long, 20 » thick, the upper part of the membrane thickened; spores 
in 8’s, bilocular, oblong and constricted, 12 to 15 # long, 4 to 5 ue thick, the loculi 
equally parted but the lower narrower and somewhat attenuate; hymenial gelatine 
blue with iodine, also the ascus membrane, but contents and spores yellow. , 
On Malvastrum fasciculatum, Santa Monica Mountains. 
la. Allarthonia patellulata caesiocarpa (Zahlbr.). 
Arthonia patellulata caesiocar pa Zahlbr. Bull. Torrey Club 27: 646. 1900, 
Thallus thin, white; apothecia pruinose; hypothecium pale; “spores 15 to 17 pe long, 
5.5 to 6 p thick.” 
Type locality, Sepulveda Canyon, Santa Monica Mountains, on the same host as 
the species, 
Type deposited with Dr, A, Zahlbruckner; duplicate in herb. Hasse 
ARTHOTHELIUM Mass. 
Differs from the genus Arthonia on! y in having muriform spores. 
KEY TO SPECIES. 
Apothecia pruinose, round or nearly so........................ 3. A. pruinascens, 
Apothecia not pruinose. 
Dark red or brown... 2.2.2... 0.000 ceceecce eee. 4. A. sanguineum. 
Black. 
Round or oval. 
Grouped in circles.............0.........2-.-..... 1. A. orbiliferum. 
Not grouped in circles............................ 2. A. taediosum. 
Irregularly or indistinctly radiate..................... 5. A. anastomosans. 
1. Arthothelium orbiliferum Almgq. 
Thallus whitish to leaden gray, smooth, thin, epiphleodal in roundish patches 
without a limiting black line, KHO-—, Ca(Cl0),—; apothecia round, small, black, 
flat, disposed in a more or less interrupted circle; epithecium bluish black, nongranu- 
