HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 83 
. KEY TO SPECIES. 
Lobes small. 
Veins with fibrils. 
Veins thick, pale....................2.2.2202-0000--- 3. P. rufescens. 
Veins not thick, obscure... ....-...--.-----++++---- 2. P. scutata. 
Fibrils almost wanting..................-------+------ 4. P. spuria. 
Lobes large. 
Smooth above....-..---- 2-22. e eee eee eee eens 1. P. canina. 
Sorediate above, especially at the border................ la. P. canina sorediata. 
1. Peltigera canina (L.) Hoffm. 
Thallus foliaceous, large, horizontally spreading, lobes rounded, entire to sinuate, 
crenate at the border, greenish or brownish, upper surface downy with clustered, 
stellate, short hairs, beneath whitish with light brown veins and fibrils; apothecia 
marginal on upper surface, round, brown red; disk flat with a finely crenate spurious 
margin; epithecium pallid, subcontinuous; thecium colorless or with a tint of yellow, 
100 to 108 » high; paraphyses coherent, strict, septate, slightly clavate and colored 
at the tips; hypothecium small-celled, pale yellowish; asci narrow clavate; spores 
fusiform, 5-locular, 56 to 68 » long, 4 to 5 thick; hymenial gelatine with iodine deep 
blue, except the unchanged epithecium. 
On earth and rocks among mosses. San Bernardino Mountains, Parish; San 
Gabriel and Santa Monica ranges; Yosemite Valley. Throughout North America; 
mountains of tropical and South America; Europe. 
la. Peltigera canina sorediata (Schaer.) Fink, Bull. Lab. Nat. Hist. Univ. Iowa 
3: 76. 1895. 
Peltigera canina spuria sorediata Schaer. Enum. Lich. Eur. 21. 1850. 
Smaller, brown above, not villous, the border turned up, crimpled and gray sore- 
diate, beneath darker than in the species; no fruiting specimens seen. On earth 
among moss in the San Gabriel Range. 
2. Peltigera scutata (Dicks.) Leight. 
Thallus small, smooth above, dusky brown, the lobules rounded, small with entire 
border, beneath paler brown than above, the fibrils short and stout and the veins not 
prominent, often of the same color as the under surface; apothecia on scarcely elongated 
lobules, short and broad, the disk dull blackish brown; spores acicular, 30 to 70 p long, 
4 to 5 thick, 5 to 8-locular. 
On earth, Lytle Creek, San Bernardino Mountains, Parish. 
3. Peltigera rufescens (Neck.) Hoffm. 
Thallus middling large, light brown (in herbarium), slightly downy and roughened 
above, paler beneath with thick, pale veins, the lobes rounded, less deeply incised 
than in P. canina, the border crenulate; apothecia on elongated lobules, oblong with 
a nearly entire margin, the disk dark red brown; spores acicular, 42 to 60 # long, 3 to 5 
thick, 4 to 8-locular. 
On earth near San Bernardino, Parish. Throughout North America; Europe; 
northern Africa; Hawaiian Islands. 
4. Peltigera spuria (Ach.) Lam. & DC. 
Lobes small, less than 1 em. wide and 1.5 to 2 cm. long, light brown and obscurely 
villous above, ascending, with slightly crenulate border, beneath of lighter color, 
scarcely villous the veins concolorous and almost destitute of fibrils; apothecia at end 
of lobule, broader than long, with revolute, thin, crenulate margin; disk flat, dark 
brown black; epithecium continuous, reddish brown, gradually paling downward; 
thecium 120, high, colorless below; paraphyses strict, coherent, dimly septate, 
slightly clavate and faintly colored at the tips; hypothecium pale reddish brown; 
asci narrowly clavate, the membrane thickened at top, 86 to 100 » long, 14 » thick; 
