HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 85 
8. Pertusaria nolens Ny]. 
Thallus thin, smooth, leaden gray or dull ash gray, finely rimose-areolate, KHO—, 
Ca(ClO),—, with determinate outline and a pale hypothallus; apothecia 1 or 2 to an 
areole, immersed, minutely crateriform or mostly irregular in shape and from the fis- 
sured thalline margin appearing stellate; disk dark; thecium colorless; paraphyses 
slender, branched and interwoven; asci cylindric-oblong, 120 to 140 » long, 32 to 36 4 
thick, 8-spored; spores ellipsoid, 32 to 42 » long, 14 to 22 » thick, acuminate-pointed 
at the ends, the endospore smooth or barely wrinkled; hymenial gelatine with iodine 
yellow and only the asci blue. 
On schistose rocks in the Santa Monica Range (Sepulveda and Rustic canyons). 
Externally it is similar to and easily confounded with Lecanora laevata Nyl. 
4. Pertusaria wulfenii Lam. & DC. 
Thallus ash gray, rugose-verrucose and rimose, neither KHO nor Ca(ClO), giving 
a reaction; apothecia in elevated, flattened verrucee; disk blackish, now and then 
dilated, depressed, with a turgid thalline margin formed by the verrucee; epithecium 
grayish yellow, after KHO pale yellow; thecium 240 high; hypothecium colorless; 
asci ventricose, containing 8 irregularly disposed spores, these ovoid-ellipsoid, 48 to 
60 » long, 24 to 32 » thick, the epispore and ascus membranes thinner than in other 
species; hymenial gelatine with iodine blue, the spores yellow. 
On various barks, Tehachapi Mountains; San Bernardino Mountains at ‘Seven 
Oaks’; Santa Catalina Island. 
5. Pertusaria pustulata (Ach.) Nyl. 
Thallus light gray with a faint yellow dash, areolate-rimose, one or several semi- 
globular verruce to an areole, KHO-+faint yellow, Ca(ClO),—; apothecia one or more 
in a wart; disk small, irregularly substellate or merely a punctiform slight depression; 
epithecium subgranulose, dark yellowish gray, thecium 80 » high; hypothecium simi- 
lar to the epithecium in color; asci tubular or cylindric, iodine staining them a deep 
blue; spores in 2’s, 80 to 136 4 long, 22 to 48 yu thick. 
On various barks; frequent in the Santa Monica Range. 
6. Pertusaria leioplaca (Ach.) Schaer. 
Thallus light yellowish gray, smooth becoming fissured, KHO+-yellow then pale 
violet, Ca(ClO),—; apothecia in sessile, semiglobular, elevated verruce, mostly 
single, sometimes 2 or 3 to a wart, slightly flattened, the disk small, almost puncti- 
form, dark, indistinct; paraphyses slender, branching; thecium colorless; spores 
ellipsoid, 44 to 96 « long, 24 to 64 thick, from 4 to 8 in an ascus seen in the same 
section of an apothecium; hymenial gelatine deep blue with iodine, the liberated 
spores yellow. 
On various barks. From Washington, Foster; Santa Cruz Mountains, Herre; 
Santa Monica Range. From southern Canada to Texas; Europe; southern Africa; 
South America. 
LECANORACEAE. 
Thallus crustaceous, uniform or lobed at the periphery, exceptionally fruticulose, 
without rhizine, affixed to the substratum by medullary or hypothalline hyphe, 
with or without a cortex; apothecia permanently innate or sessile, with a thalline 
margin; hypothecium pallid; paraphyses either not branching and separate or branch- 
ing and interwoven; asci 8 to 32-spored, the spores colorless, simple or parallel- 
bilocular to plurilocular, or muriform-multilocular; spermatia variously shaped. 
KEY TO GENERA. 
Spores simple. 
Crescent-shaped............. 20-2222 e ee eee eee eee eee Harpipivum (p. 86). 
Globular, ellipsoid, or oblong. 
Paraphyses branching, interwoven; spores large.... OCHROLECHIA (p. 95). 
Paraphyses not branching; spores not large....-.-- Lecanora (p. 86). 
