142. Lecanora ] 38. LECANORACEAE 303 



34. Lecanora cupressi Tuck., in Nyl., Flora 55:251. 1872. 



Thallus thin, granulose to densely warty, greenish gray; apothecia small to 

 middle-sized, 0.4-1 mm. across, sessile, the disk flat to slightly convex, bright 

 yellow to brownish orange, the exciple thick, colored like the thallus, crenulate; 

 spores oblong-ellipsoid, 10-16 X 4-5 /x. 



On trees, from Massachusetts to Florida, and in Louisiana. 



35. Lecanora pallida (Schreb.) Rabh., Deutschl. Krypt. Flora 2:34. 1845. 

 Lichen pallidus Schreb., Spic. Fl. Lips. 133. 1771. L.albella (Pers.) Ach. Par- 



■melia albella (Pers.) Ach. 



Thallus thin, usually smooth, or becoming thicker and chinky to warty, whitish 

 or pale cream-colored, or darkening; apothecia small to middle-sized, 0.7-3 mm. 

 across, adnate to sessile, the disk flat to convex, whitish buff to darker, white- 

 pruinose, the exciple thick, colored like the thallus, sometimes becoming obscurely 

 crenulate and flexuous or disappearing; spores ellipsoid, 8-18 X 6-10 /x. 



On trees, throughout the United States. 



var. angulosa (Schreb.) Koerb., Syst. Lich. 145. 1855. 

 Lichen angulosus Schreb., Spic. Fl. Lips. 136. 1771. L. angulosa (Schreb.) Ach. 

 Apothecia crowded, smaller, and irregularly angular. 

 On trees, throughout the United States, but not common, 

 var. cancriformis (Hoffm.) Tuck., Syn. N. A. Lich. 1:186. 1882. 

 Verrucaria cancrijormis Hoffm., Deutschl. Fl. 171. 1796. L.albella var. cancri- 

 formis (Hoffm.) Herre. L. caesiorubella Ach. 

 Thallus becoming thicker and more warty; apothecia becoming swollen and 

 larger, the disk flesh-colored to reddish, and gray-pruinose, the exciple flexuous, 

 becoming crenate and lobed. 



On trees, throughout the United States, 

 var. prolifera Fink; Hedrick, Mycologia 26:161. 1934. 

 Apothecia middle-sized, becoming proliferate. 

 On trees, South Carolina. 



36. Lecanora parisensis Nyl., Bull. Soc. Bot. France 13:368. 1866. 

 L. subfusca f. parisensis (Nyl.) Stizenb. 



Thallus moderately thick, roughly granulate or warty, chinky to areolate, yel- 

 lowish ashy to grayish; apothecia middle-sized to large, 0.6-1.6 mm. across, adnate 

 to subsessile, the disk slightly concave to flat, reddish brown to brownish black, 

 or rarely grayish pruinose, the exciple thin to moderately thick, colored like the 

 thallus, becoming wrinkled, crenulate, and sometimes flexuous; spores ellipsoid, 

 10-16 X 5-7.5 yu.. 



On trees, New Mexico. 



37. Lecanora orosthea Ach., Lich. Univ. 400. 1810. 



Lichen orosthea Ach., Lich. Suec. 38. 1798. L.expallens Ach. 



Thallus thin, chinky-areolate, frequently becoming powdery, greenish to sul- 

 phur-yellow; apothecia small to middle-sized, 0.5-0.8 mm. across, adnate to sessile, 

 the disk flat to slightly convex, buff to yellowish flesh-color, sometimes whitish 

 pruinose, the exciple thin to rather thick, colored like the thallus, becoming flexu- 

 ous and crenulate, often disappearing; spores ellipsoid, 10-17 X 6-7.5 fi. 



On trees, New England, New Jersey, and California. 



38. Lecanora effusa (Pers.) Ach., Lich. Univ. 386. 1810. 

 Lichen effusus Pers., in Hoffm., Deutschl. Fl. 2:174. 1795. 



Thallus thin, widespread, scurfy to granulose or warty-areolate, yellowish to 

 ashy or darkening, sometimes becoming scattered and disappearing; apothecia 

 minute to small, 0.2-0.6 mm. across, the disk flat to convex, reddish brown, the 

 exciple thin, obscurely powdery or subcrenulate, sometimes disappearing; spores 

 ellipsoid, 8-13 X 5-6.5 /u.. 



On old wood, Nebraska. 



