168. Buellia ] 43. BUELLIACEAE 369 



or chinky crust, becoming rough, often disappearing; apothecia minute to small, 

 0.15-0.6 mm. across, adnate, the disk flat to convex, black, the exciple black, thin, 

 and disappearing; hypothecium dark brown; spores ellipsoid, 7-16 X 4-7.5 /a. 

 On wood and rocks, throughout the United States. 



var. polyspora (Willey) Fink n. comb. 

 B.myriocarpa var. polyspora Willey, in Tuck., Syn. N. A. Lich. 2:97. 1888. 



B. polyspora (Willey) Vainio. 

 Differing from the species in that there are 12-24 spores in each ascus. 

 On trees, from Massachusetts westward to Iowa and Minnesota. 



12. Buellia conspirans (Nyl.) Vainio, Ann. Acad. Sci. Fenn. A. 6:88. 1915. 

 Lecidea conspirans Nyl., Flora 51:345. 1868. 



Thallus thin, minutely granulose, becoming chinky, white to ashy; apothecia 

 minute to small, 0.2-0.6 mm. across, adnate, round, the disk flat, black, becoming 

 irregular, the exciple thin, colored like the disk; hypothecium dark brown; spores 

 8, brown, oblong to ellipsoid, 1-septate, one cell slightly larger, 10-15 X 5-8 /x. 



On old wood, Florida. 



13. Buellia Elizae Tuck., Lich. Calif. 25. 1866. 

 Lecidea Elizae Tuck., Am. Journ. Sci. 25:428. 1858. 



Thallus of minute, round, greenish gray, scattered or crowded granules, on a 

 white hypothallus; apothecia minute to small, 0.3-0.7 mm. across, immersed to 

 adnate, the disk flat to convex, orange-red to black, the exciple prominent, black, 

 thin, and finally disappearing; hypothecium brown; spores ellipsoid, 9-15 X 4-7 /x. 



On trees, Vermont, Massachusetts, and Virginia. 



14. Buellia Schaereri De Not., Giorn. Bot. Ital. 2:199. 1846. 

 Lecidea nigritula Nyl. 



Thallus thin, scurfy, becoming minutely granulose, brownish ashy, often dis- 

 appearing; apothecia minute, 0.15-0.4 mm. across, adnate, the disk flat to convex, 

 black, the exciple thin, brownish black, and disappearing; hypothecium brownish 

 black; spores ellipsoid, 6-10 X 2.5-4.5 \x. 



On old wood, from New England to New Jersey, and westward to Illinois and 

 Minnesota. 



15. Buellia dialyta (Nyl.') Tuck., Gen. Lich. 187. 1872. 

 Lecidea dialyta Nyl., Flora 52:123. 1869. 



Thallus thin, granulose, white to ashy, often compacted into a scurfy, wide- 

 spread crust, resting on an obscure whitish hypothallus; apothecia minute to small, 

 0.2-0.6 mm. across, adnate to sessile, the disk flat to slightly convex, black, the 

 exciple thin and disappearing; hypothecium dark brown; spores fusiform-ellipsoid, 

 19-30 X 7-11 ix. 



On trees, from New England to North Carolina, westward to Minnesota, and 

 in California. 



16. Buellia spuria (Schaer.) Anzi, Cat. Lich. Sondr. 87. 1860. 



Lecidea spuria Schaer., Lich. Helv. Spic. 3:127. 1827. B. lactea (Mass.) Koerb. 



Thallus areolate, the areoles greenish gray to ashy, many-sided, often black- 

 edged, small and flat or becoming convex, scattered upon the black hypothallus or 

 crowded into a continuous chinky crust; apothecia small to middle-sized, 0.4-0.8 

 mm. across, slightly immersed to adnate, the disk flat to convex, often wrinkled or 

 papillate, black, the exciple black, prominent, finally flexuous, and rarely disappear- 

 ing; hypothecium dark brown; spores ellipsoid, 9-17 X 4.5-8 ju. 



On rocks, throughout the United States. 



17. Buellia caloosensis Tuck., Syn. N. A. Lich. 2:99. 1888. 



Thallus granulose, greenish straw-colored, the granules minute, globose, more 

 or less heaped, finally confluent on a whitish or darkening hypothallus; apothecia 

 minute to small, 0.25-0.55 mm. across, adnate, the disk flat to finally convex, becom- 



