206 33. LECIDEACEAE [119. Lecidea 



72. Lecidea diapensiae T. Fries, Nov. Act. Soc. Sci. Ups. III. 2:209. 1860. 

 Biatora diapensiae (T. Fries) Hellb. 



Thallus very thin, whitish, sometimes disappearing; apothecia small, 0.2-1 mm. 

 across, sessile, the disk flat to convex, reddish black to black, shining, the exciple 

 black, uneven to flexuous, finally disappearing; hypothecium dark reddish brown; 

 spores oblong to ellipsoid, 10-14 X 4-6 ju,. 



On old wood, New Hampshire. 



73. Lecidea promiscens Nyl, Flora 55:358. 1872. 



Thallus very thin, becoming chinky and finally areolate, whitish to ashy, often 

 disappearing; apothecia small to middle-sized, 0.4-0.8 mm. across, adnate, rarely 

 clustered and irregular, the disk flat to slightly convex, black, the exciple thin, 

 black, finally disappearing; hypothecium dark brown; spores ellipsoid to oblong- 

 ellipsoid, 9-14 X 3-5 ix. 



On sandstone, Ohio. 



74. Lecidea micytho Tuck., Syn. N. A. Lich. 2:131. 1888. 



Thallus thin, verrucose-areolate, reddish yellow, scattered and disappearing; 

 apothecia minute, 0.1-0.15 mm. across, the disk flat to convex, black, the exciple 

 black and soon disappearing; hypothecium reddish brown; spores ovoid-ellipsoid, 

 7-10.5 X 3-4.5 /x. 



On quartz, Pennsylvania, North Carolina, South Carolina, and Florida. 



75. Lecidea euphorea (Floerke) Nyl., Flora 64:187. 1881. 



L. sabuletorum var. euphorea Floerke, Ges. Naturf. Freund. Mag. 2:311. 180S. 



Thallus widespread, smooth, pale greenish gray; apothecia minute to small, 

 0.25-0.8 mm. across, sessile, the disk flat to slightly convex, brownish black to 

 black, the exciple raised, finally disappearing, brownish black; hypothecium pale 

 or darker brown; spores oblong-ellipsoid, 11-16 X 6-8 /x. 



On trees, southern California. 



76. Lecidea fuscorubens Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:199. 1861. 

 Biatora fuscorubens Nyl., Nya Bot. Notis. 183. 1853. 



Thallus thin, smooth to minutely granulose or somewhat areolate, grayish to 

 dull ashy, sometimes almost disappearing; apothecia minute to small, 0.3-0.8 mm. 

 across, sessile, the disk flat to convex, brownish black to black, rarely grayish 

 pruinose, the exciple thin, colored like the disk, soon disappearing; hypothecium 

 dark brown; spores ellipsoid, 10-13 X 5-6 /x. 



On rocks, Washington. 



Very similar to L. sanguineoatra and may be a subspecies of it, depending on 

 thallus and substratum. 



77. Lecidea platycarpa Ach., Lich. Univ. 173. pi. 2, f. 5. 1810. 



L. platycarpa var. steriza (Ach.) Rabh. L. macrocarpa (Lam. & DC.) Stend. 

 Biatora phaea Flot. 



Thallus thin, obscurely or more or less roughened, greenish gray to ashy, usually 

 chinky to subareolate, continuous, scattered, or sometimes disappearing; apothe- 

 cia small to large, 0.4-2.5 mm. across, adnate to sessile, the disk flat to convex, 

 round to irregular, brownish black to black, rarely slightly whitish pruinose, the 

 exciple black, raised, sometimes disappearing; hypothecium blackish brown; spores 

 ellipsoid, 11-20 X 5-10 /a. 



On rocks, from New England to North Carolina, and westward to California. 



78. Lecidea speirea Ach., Meth. Lich. 52. 1803. 

 Lichen speireus Ach., Lich. Suec. 59. 1798. 



Thallus subdeterminate, irregular, rather smooth, becoming chinky to areolate, 

 sometimes roughened, sometimes mealy, white to ashy white, hypothallus whitish; 

 apothecia small to middle-sized, 0.4-1.2 mm. across, immersed to rarely adnate, the 

 disk flat to convex, black, the exciple black or whitish pruinose, often disappear- 

 ing; hypothecium brown to blackish; spores ellipsoid, 9—14 X 5-8/*. (Plate 16 a.) 



