304 38. LECANORACEAE [ 142. Lecanora 



39. Lecanora varia (Hoffm.) Ach., Lich. Univ. 377. 1810. 



Patellaria varia Hoffm., Descr. PI. Crypt. 1:102. pi. 23, f. 4. 1790. Parmelia 

 varia (Hoffm.) Ach. 



Thallus thin to rather thick, smooth to warty-areolate, pale greenish, yellowish, 

 or whitish; apothecia minute to small, 0.4-1 mm. across, adnate to subsessile, the 

 disk flat to convex, flesh-colored to yellowish or buff, the exciple thin, colored like 

 the thallus, becoming crenulate and sometimes disappearing; spores oblong-ellipsoid 

 to ellipsoid, 10-14 X 4-7 ft. (Plate 29 a.) 



On trees and rocks, throughout the United States. 



40. Lecanora symmicta Ach., Syn. Meth. Lich. 340. 1814. 



L. varia var. symmicta Ach. L. varia var. saepincola (Ach.) Link. L. symmicta 



var. saepincola (Ach.) T. Fries. 

 Thallus thin to moderately thick, smooth to scurfy or subgranulose, yellowish 

 to whitish, rarely disappearing; apothecia minute to small, 0.2-1 mm. across, adnate, 

 the disk flat to strongly convex, round to variously irregular, pale yellowish to 

 reddish and blackening, the exciple thin, colored like the thallus, evanescent or 

 disappearing later; spores ellipsoid, 9-14 X 3.5-5.5 /x. 

 , On old wood, throughout the United States. 



41. Lecanora polytropa (Ehrh.) Rabh., Deutschl. Krypt. Flora 2:37. 1845. 

 Verrucaria polytropa Ehrh., in Hoffm., Deutschl. Fl. 196. 1796. Parmelia varia 



var. polytropa (Ehrh.) E. Fries. L. varia var. polytropa (Ehrh.) Dietrich. 



Thallus thin to moderately thick, somewhat rough, chinky to areolate, sub- 

 squamulose, or rarely granulose, greenish to yellowish or whitish, sometimes scat- 

 tered and disappearing; apothecia small to middle-sized, 0.5-1.3 mm. across, adnate 

 to subsessile, the disk flat to convex, yellowish flesh-colored to brownish, the 

 exciple thin, colored like the thallus, flexuous, subcrenulate, sometimes disappear- 

 ing; spores ellipsoid, 10-15 X 5-7 ft. 



On rocks, New England, New York, Minnesota, Montana, Washington, and 

 California. 



var. alpigena (Ach.) Rabh., Deutschl. Krypt. Flora 2:37. 1845. 



L. varia var. alpigena Ach., Lich. Univ. 379. 1810. 



Thallus thin, sometimes disappearing; apothecia small to middle-sized, 0.5-1.5 

 mm. across, adnate, clustered or crowded, often irregular from pressure, the exciple 

 thin, colored like the thallus, disappearing, and the proper exciple becoming con- 

 spicuous. 



On alpine rocks, Oregon, 

 f. illusoria (Ach.) Leight., Lich. Flora Great Brit. 198. 1871. 



L. varia var : illusoria Ach., Lich. Univ. 380. 1810. 



Thallus very inconspicuous and evanescent; apothecia minute to small, 0.3-0.7 

 mm. across, subsessile on the substrata or minute subtended thallus areas, the 

 disk flat to convex, pale brown, the thin thalloid veil very inconspicuous and evanes- 

 cent, never seen in mature apothecia, but replaced by a pale proper exciple. 



On rocks, Wyoming, Washington, and California. Its position with the present 

 species or even the genus is doubtful. 



42. Lecanora oregana Tuck., Syn. N. A. Lich. 1:193. 1882. 



Thallus thick, composed of coarse, crowded and sometimes heaped or con- 

 fluent, strongly convex, greenish yellow, sometimes centrally stalked areoles; apo- 

 thecia middle-sized to large, 1.5-3 mm. across, subsessile, the disk flat to convex, 

 reddish brown, the exciple rather thin, colored like the thallus, incurved, soon 

 crenulate, and often flexuous; spores ellipsoid to subglobose, 10-14X6-8/*. 



On rocks, Idaho and Oregon. 



43. Lecanora badia (Hoffm.) Ach., Lich. Univ. 407. 1810. 



Lichen badia Hoffm., Deutschl. Fl. 182. 1796. Parmelia badia (Hoffm.) Hepp. 

 Thallus thin, warty and chinky to areolate, or subsquamulose, greenish ashy to 



