224 33. LECIDEACEAE [ 125. Bilimbia 



10. Bilimbia trisepta (Naeg.) Arn., Lich. Monac. Exsicc. 118. 1890. 



Lecidea trisepta Naeg., in Mull. Arg., Mem. Soc. Phys. Hist. Nat. Geneve 

 16:404. 1862. Bacidia trisepta (Naeg.) Zahlbr. Biatora trisepta (Naeg.) 

 Willey. 

 Thallus thin, minutely granulose, grayish to ashy or brownish; apothecia 

 minute, 0.08-0.2 mm. across, adnate, scattered or clustered, the disk convex, black, 

 the exciple of same color and soon disappearing; hypothecium pale brown; spores 

 fusiform-ellipsoid, 3-septate, 14-21 X 3.5-5 j*. 

 On trees, Massachusetts. 



11. Bilimbia acclinis (Mass.) Trevis., Linn. 28:293. 1856. 



Arthrosporum accline Mass., Gen. Lich. 20. 1854. Bacidia acclinis (Mass.) 

 Zahlbr. 



Thallus thin, verrucose to scaly or granulose, greenish gray to ashy, often dis- 

 appearing; apothecia minute to small, 0.3-0.7 mm. across, adnate, the disk flat to 

 convex, black, the exciple thin, of same color and often disappearing; hypothecium 

 pale yellowish; spores 8-16, oblong-ellipsoid, somewhat curved, 3-septate, 9-18 X 

 4-5 fx. 



On trees, from New England to Minnesota, Iowa, and Nebraska. 



12. Bilimbia Pammellii Fink; Hedrick, Mycologia 26:156. 1934. 



Thallus granulose, continuous, scattered, greenish gray, becoming a thin, 

 chinky crust; apothecia small to middle-sized, 0.3-0.7 mm. across, adnate, scattered 

 or rarely clustered, the disk slightly to strongly convex, black, the exciple of the 

 same color and soon disappearing; hypothecium pale brown; spores oblong-ellipsoid, 

 3-septate, 15-24 X 3-4.5 fx. 



On sandstone, Iowa. 



13. Bilimbia rubricosa (Mull. Arg.) Fink n. comb. 



Patellaria rubricosa Mull. Arg., Hedwigia 34:142,143. 1895. Bacidia rubricosa 

 (Mull. Arg.) Zahlbr. 



Thallus thin, widespread, minutely granulose or granulose-scurfy, whitish or 

 yellowish white; apothecia middle-sized to large, 1-1.5 mm. across, sessile, more or 

 less scattered, the disk flat, red to reddish brown, the exciple thin, somewhat 

 lighter than the disk; hypothecium hyaline; spores oblong to dactyloid-oblong, 

 curved, 3-septate, 33-36 X 3.5-5 /x. 



On trees, Idaho (description was made from the original description and one 

 prepared by A. Zahlbruckner, who studied the original specimen). 



14. Bilimbia Ravenelii (Tuck.) Fink n. comb. 



Biatora Ravenelii Tuck., Syn. N. A. Lich. 2:34. 1888. Bacidia Ravenelii (Tuck.) 

 Zahlbr. 



Thallus thin, minutely granulose, greenish gray; apothecia minute to small, 

 0.15-0.5 mm. across, sessile, the disk concave to flat, pale flesh-colored, the exciple 

 elevated, thin and lighter in color; hypothecium hyaline; spores oblong-ellipsoid 

 to fusiform, 3-5-septate, 16-25 X4-5ju. 



On sandstone, Florida. 



15. Bilimbia rubidofusca (Willey) Fink n. comb. 



Biatora rubidofusca Willey, Enum. Lich. New Bedford, Mass. 23. 1892. Bacidia 

 rubidofusca (Willey) Zahlbr. 



Thallus thin, granulose, greenish gray, often forming a continuous, scarcely 

 granulose crust; apothecia minute to small, 0.15-0.25 mm. across, adnate to sessile, 

 scattered or sometimes clustered, the disk concave, brownish red to blackish, the 

 exciple of same color or darker; hypothecium hyaline; spores ellipsoid to fusiform, 

 3-5-septate, 13-22 X 4-5.5 /x. 



On soil, near New Bedford, Massachusetts. 



