125. Bilimbia] 33. LECIDEACEAE 225 



16. Bilimbia lignaria (Ach.) Mass., Ric. Lich. 121. f. 236. 1852. 



Lecidea lignaria Ach., Vet. Akad. Nya Handl. 236. 1808. Biatora milliaria (E. 

 Fries) Tuck. Bacidia milliaria (E. Fries) Sandst. Bacidia milliaria f. lignaria 

 (Ach.) Hasse. Bacidia lignaria (Ach.) Lettau. 



Thallus thin, brownish to ashy, granulose, sometimes becoming roughly verru- 

 culose or scurfy, or disappearing; apothecia minute to small, 0.25-0.65 mm. across, 

 partly immersed to sessile, commonly clustered or confluent, the disk convex to 

 spherical, brownish black to black, the exciple black, disappearing; hypothecium 

 hyaline; spores finger-shaped to fusiform, 3-7-septate, 18-38 X 4.5-8 /*. 



On rotten wood and dead mosses, from New England to Florida, and recurring 

 in California. 



17. Bilimbia tricholoma (Mont.) Fink n. comb. 



Biatora tricholoma Mont., Ann. Sci. Nat. Bot. III. 16:53. 1851. Biatora leuco- 

 blephara Nyl. 



Thallus thin, scurfy, grayish green to greenish ashy; apothecia minute to 

 small, 0.15-0.4 mm. across, adnate, rarely clustered, the disk flat to convex, pale 

 brown to blackish, the exciple pale, exteriorly often whitish cobwebbed, soon dis- 

 appearing; hypothecium blackish brown; spores fusiform-ellipsoid to finger-shaped, 

 3-septate, 10-15 X 3-5 /x. 



On trees, Florida, South Carolina, and Georgia. 



18. Bilimbia artyta (Ach.) Fink n. comb. 



Lecidea artyta Ach., Lich. Univ. 170, 171. 1810. Biatora artyta (Ach.) Tuck. 



Thallus rather thick, granular, greenish gray to ashy, the granules flat, often 

 becoming dilated and sublobulate, sometimes more or less scattered; apothecia 

 small, 0.3-0.7 mm. across, sessile and often clustered, the disk convex to hemi- 

 spherical, pale lead-colored to blackish brown or finally black, the exciple soon 

 disappearing; hypothecium brown; spores finger-shaped, 3-septate, 12-24X4-6/*.. 



On soil, Rocky Mountains of Colorado. 



19. Bilimbia melaena (Nyl.) Arn., Flora 48:596. 1865. 



Lecidea melaena Nyl., Bot. Not. 182. 1853. Biatora melaena (Nyl.) Tuck. 

 Bacidia melaena (Nyl.) Zahlbr. 



Thallus very thin, granulose to scurfy, grayish green to brownish and often 

 disappearing; apothecia minute, 0.2-0.5 mm. across, sessile, clustered, the disk 

 soon very convex, coal black, the exciple of same color, soon disappearing; hypo- 

 thecium pale reddish-brown; spores oblong-ellipsoid, 3-septate, 12-18X3-5/*.. 



On old logs, New England to Florida, and westward to Louisiana and Ohio. 



20. Bilimbia microcarpa T. Fries, Bot. Not. 1863:8. 1863. 



B. obscurata var. microcarpa T. Fries, Nov. Act. Soc. Sci. Ups. III. 3:283. 1861. 

 Bacidia microcarpa (T. Fries) Lettau. 



Thallus thin to moderately thick, granulose, greenish gray to ashy, becoming 

 scattered and often disappearing; apothecia minute to small, 0.25-0.7 mm. across, 

 adnate, sometimes clustered, the disk soon convex or subglobose, dirty brown to 

 black, the exciple pale and soon disappearing; hypothecium pale reddish brown; 

 asci often inflated; spores fusiform, 3-septate, 15-23 X 3.5-6/*. 



On shaded sandstone, Hocking County, Ohio. 



21. Bilimbia granosa (Tuck.) Fink n. comb. 



Lecidea granosa Tuck., Proc. Am. Acad. 5:420. 1862. Toninia granosa (Tuck.) 

 B. de Lesd. 



Thallus thin, minutely granulose, greenish to ashy, forming a broken crust or 

 scattered, scurfy and disappearing; apothecia minute to small, 0.2-0.5 mm. across, 

 adnate, the disk flat to slightly convex, black or rarely pale livid, the exciple black, 

 finally disappearing; hypothecium reddish brown; spores oblong-ellipsoid to finger- 

 shaped, 3-septate, 10-20 X 2.5-4.5 fi. 



On bricks, mortar and calcareous rocks, from New York to Florida, and west- 

 ward to California. 



