HASSE—LICHEN FLORA OF SOUTHERN CALIFORNIA. 95 
24. Lecanora melanaspis alphoplaca (Wahl.) T. Fries. 
Thallus crustaceous centrally, covered by the numerous apothecia, at the periphery 
becoming lobed, the lobes oblong or rounded, entire or variously lobed and even 
stellate in outline, dull brownish gray with a more or less marked whitish margin, 
the peripheral lobes not closely affixed, whitish beneath, each containing one to 
several apothecia; apothecia becoming large, from 0.5 mm. to 1.5 mm. wide; disk 
from plane with an entire, elevated margin to finally convex with the margin obso- 
lete, darker in color than the thallus to at last dull black, a few showing a faint whitish 
bloom in the center, the greater number naked; epithecium subcontinuous, brown; 
thecium colorless, 64 to 72 » high; paraphyses coherent, thick, about 2 or 3-septate 
as seen alter KHO, not furcate; asci clavate, 40 « long, 14 » thick, nearly reaching the 
colored epithecium; hypothecium colorless; spores 8, ovoid, 9 to 11 yp long, 5 to 6 # 
thick, the epispore thin and indistinct, the spore contents minutely granular, giving 
the spore-containing ascus the appearance of an Acarospora; hymenial gelatine with 
iodine blue, rapidly changing to a rich, dark copper red, the epithecium not becoming 
stained; KHO giving finally a sordid orange color; no change with NO,, except a 
bleaching of the epithecium. 
On quartz rock at Eden Hot Spring, Riverside County. 
OCHROLECHIA Mass. 
Thallus crustaceous, uniform, rimose-areolate to warty; spores large; paraphyses 
branched and intertwining. 
1. Ochrolechia pallescens (L.) Mass. 
Thallus thick, white to pale gray, rimose-areolate, the areolz often warty, KHO—, 
Ca(C1O0),—; hypothallus pallid; apothecia sessile and adnate- sessile, 1 to 3 mm. 
wide; disk flat, pale yellowish red, smooth or papillate, with a turgid, permanent, 
erect, entire thalline margin, the disk and margin with KHO (Ca(ClO).)-+-pale red; 
thecium colorless; paraphyses slender, branching and intertwining; hypothecium 
colorless, resting upon the gonidial layer; asci elongate-ventricose; spores 8, ellip- 
soid, 50 to 64 » long, 24 to 32 » thick; reaction with iodine blue. 
On various barks, In southern California in the higher mountains, mostly on 
bark of Pseudotsuga macrocarpa. Santa Catalina Island, Trask, Throughout North 
America; northern Asia; western Africa; South American Andes; Europe. 
LECANIA Mass. 
Thallus crustaceous, uniform, occasionally lobate at the periphery or squamulose, 
the squamules rarely warty; gonidia Pleurococcus. 
KEY TO SPECIES. 
Substratum bark. 
Spores 2-locular. , 
Thallus whitish, thin..............-.-.-------- eee LL 
LL. dimera. 
Thallus gray, effuse, thin.. . 7. L. cyrtella. 
Spores 2 to 4-locular; thallus whitish to grayish, chinky. . 8. L. syringea. 
Substratum rock. 
Thallus obsolete; apothecia biatorine.............-....... 4. L. toniniordes. 
Thallus present. 
Thallus more or less brown. 
Reddish brown, verrucose. ecececeeeeeee---- 9. DL. dudleyi. 
Pale grayish brownish, squamulose. we eee cee eeer ewes 5. L. brunonis. 
Thallus gray or white. 
Gray; squamulose. 
Squamules coarse.........2-0.----2-eee eee BE. turicensis calt- 
fornica, 
Squamules rather small............---------- 6. L. subdispersa. 
White.........--- we cw ewan tee eeasnaereeercens= 2. L. erysibe. 
