119. Lecidea] 33. LECIDEACEAE 211 



104. Lecidea atrobrunnea (Ram.) Schaer., Lich. Helv. Spic. 134. 1828. 

 Rhizocarpon atrobrunneum Ram., in Lam. & DC, Fl. France 2:367. 1815. 

 Thallus squamulose-areolate, the areoles tough, scattered or clustered, flat 



to convex, lobed, appressed toward the center and ascending and wavy at the 

 margin, at length wrinkled, the outer ones sometimes elongated, smooth, shining 

 to dull, yellowish to copper- or chestnut-brown, the margins blackening, the hypo- 

 thallus black; apothecia small to middle-sized, 0.5-1.5 mm. across, sessile, some- 

 times clustered, the disk concave to sometimes slightly convex, black, the exciple 

 also black, thick, raised, flexuous; hypothecium finally brown; spores ellipsoid, 

 7-12 X3-6/x. 



On granite rocks, mountains of Colorado, Wyoming, Nevada, California, Oregon, 

 and Washington. 



105. Lecidea fuscoatra (L.) Ach., Meth. Lich. 44. 1803. 

 Lichen fuscoatra L., Sp. PI. 1140. 1753. L.jumosa Ach. 



Thallus squamulose-areolate, the areoles thin, scattered or crowded, flat to 

 slightly concave, sometimes becoming imbricated, the blackening margins ascending 

 and wavy to lobulate, reddish brown to blackish, the hypothallus black, often 

 distinct; apothecia middle-sized to large, 0.6-1.5 mm. across, adnate to sessile, the 

 disk flat to strongly convex, slightly pruinose, finally black, the exciple thin, black, 

 finally disappearing; hypothecium blackish brown; spores oblong-ellipsoid, 9-16 X 

 5-7 fi. 



On rocks, usually alpine, from New England to California and Oregon. 



106. Lecidea fuliginosa Tayl., in Mack., Fl. Hibern. 2:131. 1836. 



Thallus granulose-squamulose, conglomerate, occurring in small, thickish areas, 

 dark reddish brown, the hypothallus brownish black; apothecia small, 0.4-0.8 mm. 

 across, often clustered, the disk somewhat convex, black, the exciple also black, 

 thin, soon disappearing; hypothecium brownish black; spores ovoid-ellipsoid, 

 8-10 X 5-6 fx. 



On rocks, West Virginia and Tennessee. 



107. Lecidea intumescens (Floerke) Nyl., Act. Soc. Linn. Bord. 21:373. 1856. 

 L.petraea var. intumescens Floerke; Flot., Flora 11:690. 1828. L.insularis Nyl. 

 Thallus rough, the warts running together into a convex, tawny-brown to 



brownish ashy crust, composed of areoles or folded squamules; apothecia minute 

 to small, 0.3-0.6 mm. across, flat, partly immersed to adnate, often clustered and 

 angular, the disk black, the exciple thin, black ; hypothecium brown ; spores broadly 

 ellipsoid, 10-13 X 5-7 /*.. 

 On sandstone, California. 



108. Lecidea protabacina Nyl.; Hasse, Bull. South. Calif. Acad. 2:60. 1903. 

 Thallus squamulose, reddish brown, the squamules swollen, strongly convex, 



smooth, shining, round, sometimes lobulate, or angular, crowded or rarely scattered; 

 apothecia middle-sized to large, 0.5-2 mm. across, often clustered, sessile, becoming 

 flexuous, the disk flat to convex, smooth, shining, black, the exciple blackish, thin 

 and disappearing; hypothecium dark brown; spores oblong-ellipsoid, 10-12 X 

 4-5 fi. 



On granite, Washington and California. 



109. Lecidea fuscatoatra Nyl., in Hasse, Lich. South. Calif, ed. 2. 20. 1898. 

 Thallus thickish, squamulose, the squamules continuous, concave to convex or 



undulate, round or angular to lobulate, brown varying toward gray; apothecia 

 middle-sized, 0.7-1.6 mm. across, adnate, irregularly round, the disk flat to slightly 

 convex, black, the exciple also black, thin, raised, entire to wavy or deeply lobulate; 

 hypothecium brown; spores long-ellipsoid, 8-12 X 3-4/*.. 

 On rocks, southern California. 



