228 33. LECIDEACEAE [126. Bacidia 



finally disappearing; hypothecium hyaline; spores 3-14-septate, long-cylindrical 

 to acicular, 27-40 X 1.8-2.3/*. 



On trees, New England, California, and Washington. 



3. Bacidia rosella (Pers.) De Not., Giorn. Bot. Ital. 2 1 :190. 1846. 

 Lichen rosellus Pers., Ann. Bot. Usteri 1:25. 1794. 



Thallus thin, subgranulose, greenish gray to white; apothecia small to middle- 

 sized, 0.1-0.8 mm. across, adnate to subsessile, the disk slightly concave to con- 

 vex, flesh- to rose-colored, sometimes obscurely pruinose, the exciple thick and 

 slightly paler, finally disappearing; hypothecium hyaline; spores S-9-septate, 45-75 

 X 3-5 /*. 



On trees, Maine and Vermont. 



4. Bacidia stigmatella (Tuck.) Zahlbr., Cat. Lich. Univ. 4:241. 1926. 



Biatora stigmatella Tuck., Gen. Lich. 167. 1872. 



Thallus powdery-granular, pale greenish to ashy; apothecia minute to small, 

 0.2-0.5 mm. across, adnate to sessile, the disk flat to convex, yellowish to reddish 

 or finally leaden-brown, the exciple slightly darker, finally disappearing; hypothe- 

 cium hyaline; spores 3-, rarely 5-7-septate, 22-40 X 1.5-2.5/*. 



On trees, Louisiana, Texas, and Illinois. 



5. Bacidia Herrei Zahlbr., Ann. Mycol. 6:130, 131. 1908. 



Thallus thin, granulose to subgranulose or approaching chinky-areolate, pale 

 greenish yellow, bordered by gray; apothecia middle-sized, 0.8-1.2 mm. across, 

 sessile, somewhat angular when clustered, the disk flat to convex, dark purplish 

 red, the exciple of the same color, thin, often flexuous, sometimes finally disap- 

 pearing; hypothecium hyaline; spores fusiform-acicular, 4-7-septate, 35-40 X 

 1.7-1.8/*. 



On dead twigs, California. 



6. Bacidia Augustini (Tuck.) Zahlbr., Cat. Lich. Univ. 4:102. 1926. 



Biatora Augustini Tuck., Syn. N. A. Lich. 2:42. 1888. 



Thallus of greenish gray to brownish, imbricated or expanded, and stellate 

 squamiform scales, upon a black hypothallus; apothecia small to middle-sized, 

 0.5-1 mm. across, subsessile, solitary or clustered, the disk flat to convex, pale 

 lead-colored to dark reddish, the exciple blackish to black, and soon disappearing; 

 hypothecium hyaline; spores acicular, becoming 3-septate, 30-40X1.5-2/*. 



On trees, Florida. 



7. Bacidia microphyllina (Tuck.) Riddle, Mycologia 15:80. 1923. 



Lecidea microphyllina Tuck., Proc. Am. Acad. 6:278. 1866. Biatora micro- 

 phyllina Tuck. 



Thallus of minute, cut-crenate, greenish ashy to brownish, ascendant squam- 

 ules; apothecia small to middle-sized, 0.2-0.8 mm. across, adnate, the disk flat to 

 convex, yellowish to reddish, the exciple of same color, becoming flexuous and 

 disappearing; hypothecium hyaline; spores 3-5-septate, 18-28X2-3/*. 



On trees, Florida. 



8. Bacidia egenuloidea Fink, Ohio Biol. Surv. 2:346. 1921. 



Thallus of minute, crowded granules, forming a rather thick, wrinkled and 

 obscurely chinky, dirty olive and darkening crust; apothecia minute to small, 0.25- 

 0.4 mm. across, subsessile, the disk flat, yellowish brown and darkening, the ex- 

 ciple darker; hypothecium hyaline or tinged brown; spores obscurely 5-9-septate, 

 variously curved, 25-40 X 0.75-1.25 /*. 



On granite, Ohio. 



9. Bacidia subgranulosa (Tuck.) Riddle, Mycologia 4:131. 1912. 



Lecidea microphyllina var. subgranulosa Tuck., Proc. Am. Acad. 6:278. 1866. 



Thallus thin to moderately thick, composed of minute granules, forming a 



rough, greenish gray to brownish crust; apothecia middle-sized to large, 1-2.5 mm. 



