126. Bacidia ] 33. LECIDEACEAE 229 



across, sessile, the disk flat to slightly convex, dark flesh-colored to reddish or 

 brownish, the exciple thin, becoming flexuous and soon disappearing; hypothecium 

 hyaline to tinged brownish; spores 8, hvaline, acicular, indistinctly many-septate, 

 25-38 X 1.5-2.5 /a. 



On trees, Georgia and Louisiana. 



10. Bacidia inundata (E. Fries) Koerb., Syst. Lich. 187. 1855. 

 Biatora inundata E. Fries, Vet. Akad. Handl. 1822:270. 1822. 



Thallus minutely granulose or chinky to subareolate, greenish gray to ashy or 

 darkening; apothecia minute to small, 0.3-0.7 mm. across, adnate or rarely partly 

 immersed, the disk flat to convex, pale brown, lead-colored, reddish brown, to 

 finally black, the exciple at first paler, then of the same color, finally disappear- 

 ing; hypothecium pale to brown; spores 3-7-septate, 20-40 X 1.5—2.5 /u.. 



On rocks, rarely on wood, throughout United States east of Rocky Mountains. 



11. Bacidia akompsa (Tuck.) Fink, Cont. U.S. Nat. Herb. H 1 :^. 1910. 

 Biatora akompsa Tuck., Syn. N. A. Lich. 2:47,48. 1888. 



Thallus of minute granules, forming a scurfy, or compacted and chinky, smooth 

 or rough- verrucose, ashy crust; apothecia minute to small, 0.2-0.5 mm. across, 

 adnate to sessile, the disk flat to subhemispherical, rough, black, the exciple paler, 

 uneven; hypothecium hyaline to brownish; spores 3-5-septate, 19-30 X 2-3 /a. 



On trees, Minnesota, California, and Washington. 



12. Bacidia bacillifera (Nyl.) Fink, Cont. U.S. Nat. Herb. 14 L :91, 92. 1910. 

 Lecidea bacillifera Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:210. 1861. 



Thallus of minute granules forming a thin, rough, ashy to whitish crust, some- 

 times disappearing; apothecia minute to small, 0.3-0.8 mm. across, adnate to sub- 

 sessile, the disk flat to convex, brownish to blackish, the exciple thick, soon dis- 

 appearing; hypothecium hyaline to pale brownish; spores 3-7-septate, 19-32 X 

 1.7-2.3 /i. 



On trees, Massachusetts. 



13. Bacidia chlorantha (Tuck.) Fink, Cont. U.S. Nat. Herb. 14 l :91. 1910. 

 Biatora chlorantha Tuck., Syn. Lich. New Eng. 60. 1848. 



Thallus of rather coarse, scattered granules, becoming flattened and crowded, 

 then forming a bright green or paler to brownish, somewhat chinky crust, the 

 hypothallus black; apothecia small to middle-sized, 0.4-1 mm. across, sessile, 

 the disk flat to slightly convex, dark reddish brown to black, the exciple thick, 

 blackish, often flexuous; hypothecium hyaline to pale brownish; spores 30-50, 

 indistinctly 3-7-septate, 20-35 X 2-i \x. 



On trees, New England, New York, Ohio, Illinois, and Minnesota. 



14. Bacidia atrogrisea (Hepp) Koerb., Par. Lich. 133. 1865. 



Biatora atrogrisea Hepp, Spor. Flecht. Eur. 26. 1853. B. endoleuca (Nyl.) 

 Kickx. 



Thallus thin, smoothish, becoming granulose or chinky-verrucose, greenish ashy 

 to ashy white, hypothallus blackening; apothecia small, 0.5-0.75 mm. across, 

 adnate to sessile, the disk slightly concave to convex, blackish brown to black, the 

 exciple of the same color, thick, finally disappearing; hypothecium hyaline to red- 

 dish brown or brown; spores 7-15-septate, 30-60 X 2.5-4.5 p.. 



On trees, Massachusetts to Florida, and westward to Kansas and Minnesota. 



15. Bacidia effusa (J. E. Smith) Trevis., Linn. 28:293. 1856. 



Lichen effusus J. E. Smith, in Sowerby, Engl. Bot. 26:1863. Biatora effusa 

 (J. E. Smith) Tuck. 



Thallus thin, scurfy or powdery, becoming chinky, greenish ashy to whitish; 

 apothecia small, 0.4-0.8 mm. across, adnate, the disk flat to convex, pale flesh- 

 colored to reddish brown, the exciple of the same color, soon disappearing; hypo- 

 thecium pale yellowish, spores indistinctly many-septate, 25-45 X 1.5-2 ju,. 



On trees, Massachusetts, Iowa, and California. 



