202 33. LECIDEACEAE [ 119. Lecidea 



to convex, reddish brown to black, becoming wrinkled, the exciple thick, brownish 

 to black and shining, finally becoming irregular and disappearing; hypothecium 

 hyaline; spores oblong-ellipsoid, non-septate to appearing 1-septate, 10-12 X 3-6 /i. 

 On rocks, Washington and California. 



50. Lecidea floridensis Nyl.; Eckf., Bull. Torr. Club 16:104. 1889. 



Thallus thin, continuous, slightly powdery, ashy to darker; apothecia middle- 

 sized, 0.5-1 mm. across, adnate, the disk flat to slightly convex, black, the exciple 

 thick, raised, black; hypothecium dusky; spores ellipsoid, 11-15X6-8 /a. 



On trees, Florida. 



51. Lecidea catalinariae Stizenb.; Hasse, Bull. Torr. Club 24:447,448. 1897. 

 Thallus warty, greenish yellow, the warts distinct, crowded or scattered, small, 



round, smooth, sometimes larger, and then oblong and distinctly lobulate; apothe- 

 cia middle-sized, 0.6-1.2 mm. across, immersed to adnate, often clustered and 

 angular, the disk flat to slightly convex, black, the exciple rather thick, black, 

 finally partially disappearing; hypothecium hyaline to yellowish; spores ovoid- 

 ellipsoid, 12-17 X 6-9/*. 



On sandstone, Santa Catalina Island, California. 



52. Lecidea Hassei Zahlbr., Ann. Mycol. 10:374. 1912. 



Thallus rather thick, yellowish ashy, widespread, continuous, somewhat rough- 

 ened, and chinky; apothecia large, 0.5-1.5 mm. across, sessile, the disk concave 

 to flat, black, the exciple blackish, rather thick, becoming irregular and cut-wavy 

 to strongly flexuous; hypothecium yellowish; spores long-oblong-ellipsoid, 10-12 X 

 2—3.5 fx. 



On sandstone, southern California. 



53. Lecidea aitema Ach., Lich. Univ. 178. 1810. 



Lecanora varia var. aitema (Ach.) Cromb., Lich. Brit. 52. 1870. 



Thallus moderately thick, smooth to scurfy or powdery, light or greenish gray 

 to yellowish or bright yellow; apothecia minute to small, 0.3-0.6 mm. across, 

 adnate, often closely clustered, the disk flat to strongly convex, dull black, the 

 exciple thin and inconspicuous, black, finally disappearing, surrounded at first 

 by a thin, evanescent, thalloid veil; hypothecium and hymenium hyaline to yellow- 

 ish; asci broadly clavate; spores oblong-ellipsoid, 9-14 X 3.5-5.5 fi. 



On old wood, New England and Illinois. 



54. Lecidea armeniaca (Lam. & DC.) E. Fries, Syst. Veg. 286. 1825. 

 Rhizocarpon armeniacum Lam. & DC, Fl. France ed. 3. 2:366. 1815. 

 Thallus thick, pale yellowish to yellowish red, chinky-areolate, the areoles flat 



to convex, wrinkled, the hypothallus black, usually showing between the areoles; 

 apothecia middle-sized to large, 1-3 mm. across, immersed, the disk flat to convex, 

 black, the exciple soon disappearing; hypothecium hyaline to dusky; spores ellip- 

 soid, 9-13 X 4-6 fx. 



On granite rocks, the Rocky Mountains, Montana, and Washington. 



55. Lecidea atrolutescens Nyl.; Herre, Proc. Wash. Acad. Sci. 12:84, 85. 1910. 

 Thallus squamulose-areolate, the areoles scattered or overlapping, flat to convex, 



round to wavy or crenate, grayish yellow to tan; apothecia small to middle-sized, 

 0.75-2 mm. across, sessile, scattered to clustered, the disk flat to convex, dull black, 

 becoming whitish pruinose, the exciple slightly paler, raised, entire to deeply wavy; 

 hypothecium cloudy to yellowish; spores oblong-ellipsoid, 12-16 X 5-8 p.. 

 On granite rocks, southern California. 



56. Lecidea Brujeriana (Schaer.) Leight., Brit. Lich. 281. 1871. 



Lecanora coarctata var. Brujeriana Schaer., Enum. Lich. Eur. 77. 1850. Biatora 



coarctata var. Brujeriana (Schaer.) Tuck. 

 Thallus granulose, passing into an areolate crust, continuous, scattered, or 

 finally disappearing, greenish gray to ashy; apothecia small to middle-sized, 0.3-1 



