— II2 — 
On a shaded moss covered boulder, Topanga Canon, Santa Monica 
Range. 
Lecanora {Squamaria Nyl.) marginaiis Hasse sp. nov. 
Thallus monophyllus, white and finely white pruinose above, roundish 
or flexuous in outline, 0.75 to 1.5 cm. in diameter, at the center about 0.5 
mm., but increasing somewhat in thickness toward the circumference, 
umbilicately attached to the substratum at the center; upper surface 
smooth or rugulose-warty and at the periphery becoming convolutely folded, 
beneath tawny flesh colored, destitute of rhizinae; the upper cortex is 
composed of several layers of perpendicularly arranged brown cells, bleach- 
ing with KHO, beneath this is the gonidial layer, the subtending medulla 
has horizontal, delicate, about i// thick, closely interwoven hyphae, the 
inferior cortex shows several layers of large round cells; thallus KHO+ 
yellow, Ca (Cl. O) 2Z ; apothecia adnate, all marginal, a few or more to each 
frond and then crowded and deformed from pressure, 1.5 mm. to less in 
diameter, the periphery of the frond is often revolute, the apothecium facing 
toward the substratum, disk black, thickly pruinose, rarely naked, concave 
to flattish and wavy, the turgid thalline margin coarctate, flexuose and often 
difformed by juxtaposition: epithecium subcontinuous, dull brown black- 
ish; thecium colorless or light ochraceous, 48// to 52/^ high; paraphyses 
stout, 2// thick, coherent, separating after KHO, scarcely thickened above; 
hypothecium of coarse cells and of the same hue with the epithecium ; asci 
clavate and inflated clavate, 48yU high, 10// to 22/^ thick; 8-spored; spores 
Gv globular to ovoid-ellipsoid, 8// in diameter to g/< to 14// long, 6.5/4 to 8.5/4 
thick, epispore thin; all himen. structures stain deep blue with Jod. ; KHO 
bleaches the epithecium a pale steel blue: the bright green gonidia are 12/4 
to 28/4 in diameter; spermogones indicated by generally numerous minute 
black dots, immersed, globular, spermatia acicular, curved. 32/4 to 40/4 long 
and barely 1/4 thick, sterigma simple, straight, attenuated above. 
On shaded lava and basaltic rocks near Little Lake station, Inyo County, 
at 1000 m. alt. From its color a conspicuous lichen on the lower side of 
inclined dark volcanic rocks. Type deposited with Rev. C. H Demetrio 
and in herb. Hasse, Sawtelle, California. 
