142. Lecanora ] 38. LECANORACEAE 305 



olive-green, often shining; apothecia small to middle-sized, 0.5-1.5 mm. across, 

 adnate to sessile, the disk flat to convex, chestnut-brown to brown, shining, the 

 exciple thick, sometimes becoming flexuously crenate, colored like the thallus or 

 becoming black; spores fusiform-ellipsoid, 9.5-14 X 3-5 [x. 

 On rocks, Maine and New Hampshire. 



44. Lecanora atriseda (E. Fries) Nyl, Mem. Soc. Sci. Nat. Cherb. 5:115. 1857. 

 Parmelia badia var. atriseda E. Fries, Lich. Eur. 149. 1831. 



Thallus of moderate thickness, composed of sometimes scattered, more or less 

 convex, coppery or duller brown areoles, each bordered by a thin black line, and 

 the whole thallus resting on a more or less apparent black hypothallus; apothecia 

 small to middle-sized, 0.4-1.2 mm. across, partly immersed to adnate, the disk 

 flat to convex, chestnut-brown to brown, the exciple thin, colored like the thallus, 

 and soon disappearing; spores ellipsoid, 8-13 X 5-7 \x. 



On rocks, New Hampshire. 



45. Lecanora Bockii Rodig., in E. Fries, Syst. Orb. Veg. 1:285. 1825. 

 Thallus thin, composed of subglobose, minute, sometimes crumbling or areolate 



granules, brownish gray to olive-brown, on a thin black hypothallus; apothecia 

 small, 0.5-0.8 mm. across, adnate to sessile, the disk flat, black, sometimes puncti- 

 form, the exciple thick, colored like the thallus; spores ovoid-ellipsoid, 16-24 X 

 11-15 fi. 



On rocks, New England. 



46. Lecanora phaeobola Tuck., Gen. Lich. 115,116. 1872. 



Thallus thin, olive-brown, becoming wrinkled and papillate-granulose, the gran- 

 ules minute and polished; apothecia small to middle-sized, 0.6-1 mm. across, ad- 

 nate, the disk flat to convex, reddish brown to black, shining, the exciple thin, 

 colored like the thallus, disappearing; spores ellipsoid, 9-16 X 3-5 ju,. 



On trees, California and Washington. 



47. Lecanora frustulosa (Dicks.) Ach., Lich. Univ. 405. 1810. 

 Lichen frustulosa Dicks., PL Crypt. Brit. 3:13. pi. 8, f. 10. 1793. 



Thallus of moderate thickness, rough, composed of crowded and imbricate to 

 somewhat scattered, much raised and irregular, greenish gray to ashy or yellowish, 

 smoothish to wartlike areoles, the margin squamulose, flatfish and lobed, often 

 appearing subfoliose; apothecia small to middle-sized, 0.6-2 mm. across, sessile, 

 the disk flat to convex, reddish brown to black, the exciple colored like the thallus, 

 becoming subcrenulate; spores ellipsoid, 9-15 X 5-7.5 /x. (Plate 29 6.) 



On rocks, throughout northern United States. 



48. Lecanora melanophthalma (Lam. & DC.) Ramond, Mem. Mus. Nat. Hist. 



Paris, 13:249. 1825. 



Squamaria melanophthalma Lam. & DC, Fl. Fr. ed. 3. 2:376. 1815. Parmelia 

 rubina var. opaca (Ach.) Schaer. 



Thallus rather thick, warty or areolate, or passing into lobed, crenately cut 

 squamules, greenish gray to yellowish brown; apothecia small to middle-sized, 0.6- 

 2 mm. across, adnate, the disk concave, pale olivaceous to black, the exciple 

 rather thick, colored like the thallus, becoming crenate and flexuous; spores ellip- 

 soid, 9-15 X 5-7.5 fi. 



On rocks, from South Dakota to Texas, and westward to California and 

 Washington. 



49. Lecanora thamnoplaca Tuck., Gen. Lich. 113. 1872. 



Thallus composed of rough, crumbling, dull brownish to yellowish, crowded, 

 convex and swollen, crenate squamules, passing at the circumference into narrow, 

 convex, wavy-margined lobes; apothecia middle-sized to large, 0.8-2.5 mm. across, 

 immersed to adnate, the disk slightly concave to flat, reddish brown to black, the 



