HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 119 
'Thallus not lobed at periphery. 
Substratum rock. 
Thallus granular, gray (occurring also on bark).... 9. B. myrtocarpa. 
Thallus not granular. 
Squamulose, white; squamules dispersed..... 7. B. retrovertens. 
Not squamulose. 
Rimose-areolate, white.........-..------ 8. B. stellulata. 
Effuse, whitish............-..---.------ 2a. B. alboatra ambigua. 
Substratum bark. 
Thallus white. 
Spores bilocular............---+--+-----+------ 13. B. penichra. 
Spores quadrilocular.............----------- 11. B. triphragmia. 
Thallus not white. 
Gray to greenish gray. 
Coarsely granular to warty.........------ 10. B. parasema. 
Less coarse, granular, smoother........... 10a. B. parasema vulgata. 
Thallus yellow to greenish yellow. 
On rock, rimose-areolate..........--.----- 14. B. halonia. 
On bark, squamulose........... weeeee eee 12. B. oidalea. 
1. Buellia rinodinoides Anzi. 
Thallus white, farinaceous, coarsely and distinctly rimose-areolate; areole flat 
to turgid, round-angular and sinuous, with KHO tardily sordid orange, Ca(ClO).—; 
apothecia black, naked, innate and flat to adnate and convex, the proper margin 
thin, concolorate and finally disappearing; epithecium subgranulose, fuliginous 
blackish; thecium colorless, 88 to 90% high, with iodine blue; paraphyses loosely 
coherent, simple, not jointed, the fuliginous tips clavate; hypothecium fuscous; 
asci clavate; spores blunt-ellipsoid, brownish gray, bilocular, 9 to 16 » long, 5 to 8 
thick, not or barely constricted at the middle; epispore thin. 
On disintegrated granite, Palm Springs, Riverside County; calcareous rocks on 
the beach at ‘‘White Point” near San Pedro. Found also in Japan and Europe. 
2. Buellia alboatra (Hoffm.) T. Fries. 
Thallus effuse or peripheral lobation indistinct, whitish, areolate-rimose and areolate- 
verrucose, KHO—, Ca(ClO),—, farinaceous, poorly developed, mostly in small 
patches; apothecia sessile, generally several grouped; disk black or with a faint 
bloom, soon slightly convex, the thin, black proper margin persistent, entire; thecium 
colorless; paraphyses separate, jointed, somewhat gelatinous, with dark heads; asci 
clavate; hypothecium pale brown; spores 8, oblong-ellipsoid, 16 to 204 long, 7 to 10 
thick, 4-locular, often a little curved, the epispore stout; hymenial gelatine blue 
with iodine; spermatia cylindric, straight. 
On bark and rocks; bark of Pseudotsuga in the Tehachapi Mountains at 1,300 meters 
altitude; on rocks in the Santa Monica Range. 
This is variety saxicola Fries of authors. 
2a. Buellia alboatra ambigua (Ach.) T. Fries. 
Thallus rimose-areolate, effigurate, thin with a blackish hypothalline border (at 
times absent); apothecia adnate; disk flat, often with a faint bloom and having a 
permanent, entire or crenulate, thickened thalline margin. 
Frequent on slate schist in the Santa Monica Range. 
Distinguished from the species by the thinner, effigurate thallus. 
8. Buellia lepidastra Tuck. 
Thallus squamulose-areolate, pale yellowish or sordid buff, the flat, soon convex, 
coarse squamules becoming lobate at the circumference, KHO+ yellow, Ca(Cl0),—; 
hypothallus black; apothecia sessile, 0.25 to 1 mm. wide; disk convex with a thin, 
