125. Bilimbia] 33. LECIDEACEAE 223 



the disk flat to commonly convex, pale to yellowish and reddish, the exciple incon- 

 spicuous and soon disappearing; hypothecium hyaline; spores fusiform-ellipsoid to 

 finger-shaped, 3-septate, 12-20 X 2-3.5 /*. 

 On limestone, Orange County, New York. 



5. Bilimbia sphaeroides (Dicks.) Koerb., Syst. Lich. 213. 1855. 



Lichen sphaeroides Dicks., PI. Crypt. Brit. 1:9. pi. 2, f. 3. 1785. Biatora sphae- 

 roides (Dicks.) Horn. Bacidia sphaeroides (Dicks.) Zahlbr. 



Thallus minutely granulose, greenish gray, often forming a thin, chinky and 

 scurfy crust, sometimes largely disappearing; apothecia small to middle-sized, 

 0.25-0.9 mm. across, adnate, sometimes clustered, the disk convex to subspherical, 

 pale flesh-colored to reddish brown, the exciple of same color and soon disappear- 

 ing; hypothecium hyaline to light brown; spores ellipsoid to fusiform, 3-septate, 

 14-22 X 3.5-6.5 /x. 



On mossy bases of trees, from New England to Florida, and westward to the 

 Rocky Mountains. 



6. Bilimbia Naegelii (Hepp) Kremphl., Bay. Bot. Ges. 4:223. 1861. 



Biatora Naegelii Hepp, Spor. Flecht. Eur. pi. 4, f. 1, 19. 1853. Bacidia Naegelii 

 (Hepp) Zahlbr. 



Thallus granulose, greenish gray, forming a chinky, more or less roughened 

 crust; apothecia small to middle-sized, 0.4-0.8 mm. across, adnate, usually clus- 

 tered, the disk convex, from flesh-colored to reddish brown or black, the exciple 

 thin, lighter colored and soon disappearing; hypothecium hyaline; spores ellipsoid 

 to fusiform, 3-septate, 18-26 X 4.5-5.5 /x. 



On trees, from New England to Florida, and westward to Minnesota. Also 

 known in California. 



7. Bilimbia gyalizella (Nyl.) Fink n. comb. 



Lecidea gyalizella Nyl, Lab. Sing. 38. 1891. Biatora gyalizella (Nyl.) Willey. 

 Bacidia gyalizella (Nyl.) Zahlbr. 



Thallus very thin, minutely granulose, ashy; apothecia minute, 0.15-0.25 mm. 

 across, adnate to sessile, the disk deeply concave, dark red, the exciple entire, 

 dark red to dusky brown; hypothecium hyaline; spores about 24, oblong-ellipsoid, 

 1-3-septate, 10-16 X 5-6 jx. 



On trees, near New Bedford, Massachusetts. 



8. Bilimbia gyalectiformis Zahlbr., Beih. Bot. Centralb. 13:158,159. 1902. 

 Bacidia gyalectiformis (Zahlbr.) Hasse. 



Thallus thin, somewhat rough, chinky, grayish to ashy white, becoming pow- 

 dery; apothecia small to middle-sized, 0.3-0.8 mm. across, partly immersed, the 

 disk deeply concave to flat, reddish to brownish black, the exciple absent and the 

 disk surrounded by a thalloid veil; hypothecium pale yellowish; spores oblong- 

 ellipsoid, 3-septate, 18-24 X 5-7 fx. 



On sandy soil among rocks, San Jacinto Mountains, California. 



9. Bilimbia declinis (Tuck.) Fink n. comb. 



Lecidea declinis Tuck., Gen. Lich. 182. 1872. Biatora declinis Tuck. Bacidia 

 declinis (Tuck.) Zahlbr. 



Thallus thin, scurfy, greenish brown; apothecia minute to small, 0.15-0.3 mm. 

 across, adnate, the disk flat to slightly convex, brownish to black, the exciple of 

 same color and soon disappearing; hypothecium hyaline to brownish; spores ellip- 

 soid to finger-shaped, 1-3-septate, 9-12 X 3-5 /x. 



On trees, Massachusetts. Spores of material seen, collected by Tuckerman and 

 Willey, have the size of European specimens and not the much smaller size of 

 Tuckerman's descriptions. 



