300 38. LECANORACEAE L 142. Lecanora 



18. Lecanora minutella Nyl, Lich. Jap. 105, 106. 1890. 



Thallus very thin, smooth, pale greenish gray to ashy or whitish, sometimes 

 disappearing; apothecia minute, 0.1-0.25 mm. across, subsessile, the disk concave 

 or flat to slightly convex, yellowish to reddish brown, the exciple thin, colored 

 like the thallus, sometimes disappearing; spores ovoid, 3-5 X 2-3 //.. 



On trees, Tennessee. 



19. Lecanora hypoptoides Nyl., Flora 55:249. 1872. 

 Lecidea hypoptoides Nyl, Flora 50:371. 1867. 



Thallus very thin, smooth to slightly rough, minutely granulose, greenish gray 

 to ashy, sometimes disappearing; apothecia minute to small, 0.1-0.bmm. across, 

 closely adnate, the disk flat to slightly convex, reddish brown to brown, sometimes 

 grayish pruinose, the exciple thin, colored like the thallus, becoming crenulate or 

 sometimes disappearing; spores 8, hyaline, ovoid to ovoid-ellipsoid, non-septate, 

 8-12 X 4.5-5.5 p. 



On old wood, New York. 



20. Lecanora miculata Ach., Syn. Meth. Lich. 164. 1814. 



Thallus thin, composed of dirty white, commonly scattered granules or warts; 

 apothecia small to middle-sized, 0.5-1 mm. across, adnate, the disk flat to slightly 

 convex, reddish brown and commonly grayish pruinose, the exciple rather thick, 

 colored like the thallus, becoming crenate; spores ellipsoid, 11-18 X 6-9 ;«.. 



On trees, from Pennsylvania to Florida, and westward to Texas and Arkansas. 

 The plants are poorly known and doubtfully included. 



21. Lecanora granulifera (Ach.) Nyl., Bull. Linn. Soc. Norm. II. 2:67. 1868. 

 Parmelia granulijera Ach., Syn. Meth. Lich. 212. 1814 pro parte. 



Thallus thin, papilliform-granulose to rugged-warty, greenish gray to ashy, upon 

 a blackening hypothallus, more or less lemon-yellow within; apothecia minute to 

 small, 0.3-0.8 mm. across, sessile, the disk flat to convex, reddish brown to black, 

 the exciple thick, colored like the thallus, rarely becoming crenate and disappear- 

 ing; spores ellipsoid, 15-26 X 9-15 p. 



On trees, Florida. Material so named from California was incorrectly deter- 

 mined. 



22. Lecanora alpina Sommerf., Suppl. Fl. Lapp. 91. 1826. 



Thallus thin, composed of round or irregular, commonly scattered, grayish or 

 lead-colored, warty areoles, upon a thin, black hypothallus; apothecia middle-sized 

 to large, 0.8-1.8 mm. across, partly immersed to superficial, the disk flat, reddish 

 to reddish black, the exciple thin, elevated, colored like the thallus, rarely disap- 

 pearing; spores 8, hyaline, ellipsoid or ovoid-ellipsoid, 9-13 X 6-8 jx. 



On rocks, Washington, Oregon, and California. 



23. Lecanora rugosa (Pers.) Nyl, Flora 55:250. 1872. 



Lichen rugosns Pers., in Ach., Lich. Univ. 394. 1810. L.subjusca var. rugosa 

 (Pers.) Nyl. 



Thallus rather thick, greenish gray to whitish, warty or granulose and finally 

 wrinkled; apothecia middle-sized to large, 0.5-2.6 mm. across, subsessile to finally 

 sessile, the disk concave to slightly convex, sometimes undulate, brown to brown- 

 ish black, often obscurely whitish pruinose. the exciple thick, elevated, becoming 

 wrinkled-crenate; spores 10-15 X 6-8 p. 



On living and old wood, and rarely on rocks, Maine, New York, Minnesota, 

 and California. 



24. Lecanora cenisia Ach., Lich. Univ. 361. 1810. 

 L.atrynea var. cenisia (Ach.) Nyl. 



Thallus thick, composed of coarse, greenish gray granules, sometimes scattered 

 or frequently forming a warty-areolate crust; apothecia small to middle-sized, 0.6- 

 2 mm. across, sessile, the disk flat to convex, livid or yellowish brown and blacken- 



