368 43. BUELLIACEAE [ 168. Buellia 



4. Buellia coracina (Hoffm.) T. Fries, Nov. Act. Soc. Sci. Ups. III. 3:331. 1861. 



Verrucaria coracina Hoffm., Deutschl. Fl. 183. 1795. Lecidea coracina (Hoffm.) 

 Nyl. B. moriopsis (Mass.) T. Fries. 



Thallus chinky to areolate, the areoles often convex and scattered, ashy black, 

 on a black hypothallus; apothecia small, 0.3-0.6 mm. across, immersed to adnate, 

 the disk flat to convex, black, more or less greenish pruinose, the exciple uneven, 

 black, soon disappearing; hypothecium brown to brownish black; spores ellipsoid, 

 8-18 X 5.5-9.5 fi. 



On rocks, New Hampshire, Vermont, Tennessee, and South Dakota. 



5. Buellia stigmaea Tuck., Syn. N. A. Lich. 2:90. 1888. 



Thallus smooth, greenish gray to yellowish or ashy, soon becoming chinky and 

 areolate, intersected and bordered by the blackish hypothallus; apothecia minute to 

 small, 0.2-0.5 mm. across, adnate, the disk flat, black, the exciple thin, light-colored 

 to black; hypothecium dark brown; spores ellipsoid, 9-14 X 3.5-6 fi. 



On rocks, Massachusetts, Pennsylvania, Alabama, and South Carolina. 



6. Buellia Blumeri Zahlbr., Ann. Mycol. 7:477. 1909. 



Thallus thin, becoming roughened and verrucose, milky white to greenish gray, 

 sometimes subpruinose; apothecia small, 0.3-0.5 mm. across, sessile, the disk con- 

 cave to convex, black, the exciple prominent, brownish black; hypothecium dark 

 brown; spores ellipsoid, 13-16 X 5-6 /i. 



On rocks, near Tucson, Arizona. 



7. Buellia semitensis Tuck., Syn. N. A. Lich. 2:95,96. 1888. 



Thallus thin, rough, wrinkled-verrucose, sometimes crumbling, sulphur-yellow 

 becoming pale; apothecia middle-sized to large, 0.6-1.4 mm. across, the disk flat to 

 convex, black, the exciple black, often disappearing; hypothecium reddish to brown- 

 ish black; spores ellipsoid, 14—27 X 7-10 fi. 



On rocks, California. 



8. Buellia retrovertens Tuck., Syn. N. A. Lich. 2:89, 90. 1888. 



Thallus minutely areolate, greenish gray to ashy, the areoles smooth, separate, 

 often convex; apothecia minute to middle-sized, 0.2-0.8 mm. across, adnate, the disk 

 flat to convex, black, the exciple brown to black, thin, disappearing; hypothecium 

 brown to brownish black; spores ellipsoid, 10-17 X 6-8 fi. 



On rocks, Colorado and California. 



9. Buellia insidians (Nyl.) Zahlbr., Cat. Lich. Univ. 7:370. 1931. 

 Lecidea insidians Nyl., Lab. & Sing. 41,42. 1891. 



Thallus thin, smooth to rough, chinky to areolate, sometimes minutely granulose, 

 ashy to whitish; apothecia minute to small, 0.2-0.5 mm. across, partly immersed, 

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

 rarely disappearing; hypothecium dark brown to brownish black; spores oblong, 

 9-12 X 3-4.5 fi. 



On rocks, Tennessee. 



10. Buellia aethalea (Ach.) T. Fries, Lich. Scand. 1:604. 1874. 



Gyalecta aethalea Ach., Lich. Univ. 669. 1810. B.atroalbella (Nyl.) Mong. 

 Lecidea atroalbella Nyl. Lecidea cohibilis Nyl. 



Thallus thin, chinky to minutely areolate, ashy or becoming white; apothecia 

 small, 0.2-0.5 mm. across, partly immersed to adnate, the disk flat to somewhat 

 convex, black, the exciple prominent, dull black; hypothecium dark brown; spores 

 ovoid-ellipsoid, 10-18 X 5-8.5 fi. 



On rocks, Tennessee. 



11. Buellia punctata (Hoffm.) Mass., Ric. Lich. 81. f. 165. 1852. 



Verrucaria punctata Hoffm., Deutschl. Fl. 192. 1796. B.myriocarpa (Lam. & 



DC.) De Not. B. myriocarpa var. punctiformis (Hoffm.) Mudd. 

 Thallus thin, greenish gray to ashy, scurfy or compacted into a smoothish 



