119. Lecidea ] 33. LECIDEACEAE 197 



thin, surrounded by a very thin thalloid yeil, exciple and veil obscurely visible 

 at the basal margins of very young hymenia, but disappearing very early; the 

 mature apothecia becoming variously irregular in form and furrowed above with 

 1 to 4 or rarely more furrows, running in various directions, sometimes intersect- 

 ing, at first shallow, but finally splitting the apothecium into about 2-5 variously 

 shaped, closely placed portions, giving the appearance of so many peculiarly 

 shaped, conglomerate apothecia; hypothecium hyaline to pale yellowish; spores 

 oblong-ellipsoid to ellipsoid, 9.5-11 X 4.5-5 /x. 

 On a granite boulder, Ohio. 



19. Lecidea lucida Ach., Meth. Lich. 74. 1803. 



Lichen lucidus Ach., Lich. Suec. 39. 1798. Biatora lucida (Ach.) E. Fries. 



Thallus rather thin, widespread, greenish yellow, minutely granulose, soon 

 powdery, continuous or scattered, sometimes forming small heaps; apothecia 

 minute to small, 0.15-0.35 mm. across, adnate, sometimes clustered to conglom- 

 erate, the disk convex, lemon-colored, becoming brownish, the exciple soon disap- 

 pearing; hypothecium pale yellowish; spores 4-7 X 2-3 /x. 



On shaded rocks and exposed roots of trees, New York, Massachusetts, and 

 Minnesota. 



20. Lecidea rufofusca (Anzi) Nyl., Flora 52:409. 1869. 

 Biatora rufofusca Anzi, Cat. Lich. Sondr. 76. 1860. 



Thallus rather thick, widespread, granulose-verrucose, whitish to brownish, 

 hypothallus whitish; apothecia small to middle-sized, 0.5-1.2 mm. across, sub- 

 sessile, the disk flat to convex, reddish brown to dark purplish, the exciple of the 

 same color, thin, finally disappearing; hypothecium pale yellow; spores oblong- 

 ellipsoid, 13-18 X 6-9 (i. 



On turfy soil and trees, Colorado. 



21. Lecidea furfuracea Pers., in Gaudich., Bot. Voy. Uran. 192. 1826. 

 Thallus thin, smooth to scurfy, obscurely chinky, ashy gray; apothecia small 



to middle-sized, 0.5-1 mm. across, the disk flat to convex, dark reddish or nearly 

 black, the exciple disappearing; hypothecium yellowish and darkening; spores 

 hyaline, ellipsoid, 10-16 X 5-8 fi. 

 On trees, Florida and Louisiana. 



22. Lecidea cadubriae (Mass.) Nyl., Not. Sallsk. Faun. Flor. Fenn. 13:335. 



1868. 



Biatora cadubriae Mass., Sched. Crit. 176. 1855. Biatora aitema Mass. 



Thallus thin, rough, composed of minute, irregularly shaped, scattered, yel- 

 lowish green or sulphur-colored granules on a white cobwebby hypothallus; apo- 

 thecia minute to small, 0.1-0.3 mm. across, immersed to adnate, the disk flat to 

 slightly convex, yellowish to dark brown, the exciple thin, dirty brown, soon dis- 

 appearing; hypothecium brownish; spores oblong-ellipsoid, 8-11X3-4 fi. 



On trees, California. 



23. Lecidea quernea (Dicks.) Ach., Meth. Lich. 62. 1803. 



Lichen quemeus Dicks., PI. Crypt. Brit. 1:9. pi. 2, f. 3. 1785. Biatora quernea 

 (Dicks.) E. Fries. 



Thallus of minute granules, greenish yellow to brownish, scattered, or crowded 

 and forming a thin, chinky crust; apothecia minute to middle-sized, 0.3-1 mm. 

 across, partly immersed to adnate, the disk fiat to convex, becoming irregular, 

 reddish brown to blackish, the exciple paler, soon disappearing; hypothecium pale 

 brownish; spores ovoid-ellipsoid, 7-11 X 4-6 /x. 



On trees and old wood, Minnesota, Montana, and California. 



24. Lecidea carnulenta (Tuck.) Fink, Cont. U.S. Nat. Herb. 14 x :73. 1910. 

 Biatora carnulenta Tuck., Proc. Am. Acad. 12:179. 1877. 



Thallus rudimentary or entirely disappearing, when present consisting of a 

 very thin and scattered crust, greenish gray to brownish; apothecia minute to 



