119. Lecidea] 33. LECIDEACEAE 209 



small to middle-sized, 0.5-1.5 mm. across, more or less immersed to adnate or sub- 

 sessile, the disk flat to convex, black, rarely and faintly pruinose, the exciple thin, 

 black, raised, sometimes finally disappearing; hypothecium brownish black; spores 

 ovoid-ellipsoid, 11-20 X 6-9 ft. 



On granite rocks, bricks, and old wood, from New England to Florida, and 

 westward to Nebraska, also in Washington. 



92. Lecidea flexuosa (E. Fries) Nyl., Act. Soc. Linn. Bord. 21:356. 1856. 

 Biatora flexuosa E. Fries, Vet. Akad. Handl. 1822. 268. 1822. 



Thallus granulose, ashy to greenish gray, the small granules scattered or clus- 

 tered, or sometimes passing into a flattened to wrinkled, moderately thick, finally 

 areolate crust; apothecia minute to small, 0.2-0.4 mm. across, adnate, becoming 

 flexuous, the disk flat, black, the exciple thin, pale lead-colored or darker; hypo- 

 thecium brown; spores oblong-ellipsoid, 5-10 X 3-5 it. 



On old wood, widely distributed throughout the United States. 



93. Lecidea fuscocinerea Nyl., Nya Bot. Not. 1852:177. 1852. 



Thallus thickish, widespread, unequal, chinky-areolate, the areoles often wart- 

 like, ashy to ashy brown, the hypothallus black; apothecia middle-sized, 0.5-1.2 

 mm! across, sessile to adnate, irregular, the disk flattish, black, the exciple lighter, 

 thin, raised, strongly and variously flexuous; hypothecium brown; spores ellipsoid, 

 9-14 X 7-10 /». 



On rocks, New Hampshire. 



94. Lecidea mamillana Tuck., Proc. Am. Acad. 12:180. 1877. 



Thallus moderately thick, more or less plainly squamulose-areolate, greenish 

 gray to brownish white, the areoles swollen, continuous or scattered, more or less 

 plainly lobed, sometimes radiately striate; apothecia minute to small, 0.2-0.5 mm. 

 across, slightly immersed to superficial in the center of the areole, the disk flat 

 to convex, black, the exciple thin, black, disappearing; hypothecium brownish to 

 brown; spores ovoid-ellipsoid, 9-16 X 5-8.5 /x,. 



On calcareous rocks, Alabama. 



95. Lecidea dolodes Nyl.; Hasse, Bull. Torr. Club 24:447. 1897. 



Thallus moderately thick, composed of small, convex, light brown, somewhat 

 crenate. finally imbricated squamules; apothecia minute to small, 0.2-0.5 mm. 

 across, adnate, sometimes clustered, the disk flat to slightly convex, black, the 

 exciple brownish to blackish, soon disappearing; hypothecium brown to blackish 

 brown ; spores globose, 7-9 jx across. 



On trees, California. 



96. Lecidea olivacea (Hoffm.) Mass., Ric. Lich. 71. 1852. 



Verrucaria olivacea Hoffm., Deutschl. Fl. 2:192. 1791. L. olivacea var. geo- 

 graphica Bagl. L. elaeochroma var. geographica (Bagl.) Zahlbr. 



Thallus thin and smooth to thick and rough, composed of scattered or con- 

 tinuous, olivaceous to yellowish or greenish gray or reddish granules, sometimes 

 limited by a black border; apothecia minute, 0.4-1 mm. across, partly immersed to 

 adnate, the disk concave to flat, or even convex, rusty black to black, the exciple 

 thin, black, and finally disappearing; hypothecium brown; spores ovoid-ellipsoid, 

 12-14 X 7-8 fi. 



On trees, California. 



97. Lecidea Manni Tuck., Syn. N. A. Lich. 2:75. 1888. 



Thallus thick, rough, composed of small, convex, crowded, greenish brown 

 areoles on a black hypothallus; apothecia middle-sized to large, 0.5-1.5 mm. across, 

 adnate, the disk flat to slightly convex, grayish pruinose, the exciple black and 

 strongly developed; hypothecium becoming brownish to brown; spores ellipsoid, 

 11-16 X 5-6 fi. 



On volcanic rocks, California. 



