308 38. LECANORACEAE [ 142. Lecanora 



60. Lecanora pinguis Tuck., Proc. Am. Acad. 6:268. 1866. 



Thallus at first thin, but becoming very thick, chinky-areolate and warty 

 toward the center and radiate to radiately folded toward the circumference, dull 

 greenish gray to sulphur-yellow as always internally; apothecia middle-sized to 

 large, 0.8-2.5 mm. across, adnate, the disk concave to flat, yellowish flesh-colored, 

 usually subpruinose, the exciple thin, colored like the thallus, crenate to flexuously 

 lobed; spores oblong-ellipsoid, 12-18 X 4-6 /x.. 



On rocks, California. 



61. Lecanora gelida (L.) Ach., Lich. Univ. 428,429. 1810. 

 Lichen gelidus L., Mant. PI. 2:133. 1771. 



Thallus moderately thick, pale greenish gray to whitish, chinky to areolate 

 toward the center, bearing cephalodia and usually whitish soredia, the margin 

 closely and deeply lobed; apothecia small to middle-sized, 0.6-1.4 mm. across, 

 adnate, the disk concave to flat, pale brick-colored and blackening, the exciple 

 thick, colored like the thallus; spores ellipsoid, 14-18 X 6-8 /x. 



On rocks, New Hampshire, California, Oregon, and Washington. 



62. Lecanora semitensis Tuck., Proc. Am. Acad. 12:172. 1877. 



L.muralis var. semitensis Tuck. L.saxicola var. semitensis (Tuck.) Hasse. 



Thallus composed of small, rather thick, round or angular, straw-colored, some- 

 times crenate-lobulate, black-edged areoles or squamules; apothecia small to mid- 

 dle-sized, 0.5-1.6 mm. across, subsessile, the disk flat to strongly convex and irreg- 

 ular, whitish pruinose to livid brown, the exciple of same color as the thallus or 

 becoming black, soon disappearing; spores ellipsoid, 9-14 X 5-7 fi. 



On rocks, California. 



63. Lecanora rubina (Vill.) Ach., Lich. Univ. 412. 1810. 



Lichen rub inus Vill., Hist. Plant. Dauphin. 3:977. 1789. L. rubina var. campes- 

 tris Tuck. 



Thallus subfoliose to rarely foliose and attached by an umbilicus, or composed 

 of more or less round-lobed, irregular and elongated, frequently imbricated squam- 

 ules, rarely reduced toward the center to flattened, irregularly lobed areoles or 

 squamules, greenish straw-colored; commonly black below; apothecia middle-sized 

 to large, 1.5-5 mm. across, rarely clustered, subsessile to sessile, the disk flat to 

 convex, pale yellow to reddish or brownish, the exciple thin, colored like the 

 thallus, becoming flexuous and disappearing; spores ellipsoid, 8-15X4.5-8^. 



On rocks, throughout the United States. 

 var. heteromorpha Ach., Lich. Univ. 412. 1810. 



Thallus chinky and wrinkled, less distinctly lobed; apothecia colored like the 

 thallus or becoming brownish. 



On rocks, Montana, Oregon, and Texas. 



64. Lecanora bipruinosa Fink; Hedrick, Mycologia 26:160. 1934. 



Thallus thick, closely adnate, light brown, whitish pruinose over small portions 

 here and there, the central portions partly chinky to subareolate or warty, and 

 in part lobulate, distinctly lobed toward the margins, the lobes slightly to strongly 

 convex, transversely more or less broken-furrowed, rather short, their borders 

 entire to irregularly and coarsely wavy-crenate, the tips sometimes tinged blackish; 

 apothecia small to middle-sized, 0.5-2 mm. across, subsessile, the disk flat to 

 slightly convex, pale yellowish green pruinose, the exciple colored like the thallus, 

 at first thick, raised, entire and round, becoming cracked-crenulate, flexuous, and 

 partly or nearly disappearing; spores oblong-ellipsoid, 10-14 X 6-7.5 /x. 



On northward-facing rocks, near Tucson, Arizona. 



65. Lecanora Haydenii Tuck., Proc. Am. Acad. 6:267. 1866. 



Thallus foliose, thick and tough, greenish straw-colored, irregularly long-lobed, 

 the lobes variously dissected above by obscure furrows, usually imbricated and 

 often convolute, their margins irregularly torn-lobed or crenate, and usually whit- 



