376 43. BUELLIACEAE [ 172. Rinodina 



E. Spores 18-30 X 8-14 /i 1. R.Hallii 



B. Not always on trees or old wood 

 C. On soil and rocks 

 D. Thallus granulose 



E. Spores 14-20 X 6-8.5 n 9. R.bolodes 



E. Spores 20-36 X 10-16 n 11. R. orbata 



D. Thallus more or less squamulose or areolate 

 E. Thallus pale yellowish to dull brown or 



grayish pruinose 33. R. phaeocarpa 



E. Thallus greenish gray to grayish flesh-colored . . . 24. R. angelica 

 C. On trees and rocks 



D. Spores 14-22 fi in length 



E. Thallus of minute granules, ashy to greenish brown . . 6. R. sophodes 

 E. Thallus areolate, greenish gray to ashy . . . . IS. R. atrocinerea 

 D. Spores 20-35 fi in length 



E. Thallus smooth to more or less concentrically wrinkled 2. R. ascociscana 

 E. Thallus coarsely granulose or warty 8. R. confragosa 



1. Rinodina Hallii Tuck., Bull. Torr. Club 5:20. 1874. 



Thallus thin to moderately thick, chinky to areolate, gray to ashy brown or 

 brown, bordered by a black hypothallus; apothecia small to middle-sized, 0.8-1.2 

 mm. across, adnate, the disk flat to convex, reddish brown to black, the exciple 

 thin, colored like the thallus, finally disappearing; hypothecium hyaline to brown- 

 ish; spores ellipsoid to oblong-ellipsoid, 18-30 X 8-14 fi. 



On trees, Washington, Oregon, and California. 



2. Rinodina ascociscana Tuck., Gen. Lich. 124. 1872. 

 Psoroma ascociscana Tuck., Am. Journ. Sci. II. 25:424. 1858. 



Thallus thin, round to irregular, smooth to more or less concentrically wrinkled, 

 becoming chinky, areolate and scaly, greenish gray to pale cinnamon-brown; 

 apothecia small to middle-sized, 0.6-1.5 mm. across, sessile, the disk flat to slightly 

 convex, pale brown to black, sometimes wrinkled, the exciple thick, colored like the 

 thallus, finally crenate; hypothecium hyaline to yellowish; spores oblong-ellipsoid, 

 20-35 X 10-16/t. 



On trees, New England, Ohio, Illinois, Minnesota, and California. 



3. Rinodina roboris (Nyl.) Am., Flora 64:197. 1881. 



Lecanora roboris Nyl., Mem. Soc. Imp. Sci. Nat. Cherb. 2:326. 1854. 



Thallus thin, grayish white, minutely granulose, becoming chinky, sometimes 

 bordered by a black hypothallus; apothecia small to middle-sized, 0.3-1 mm. across, 

 sessile, the disk flat to convex, dark brown to dull black, the exciple colored like 

 the thallus, often crenulate, finally disappearing; hypothecium hyaline; spores 

 oblong-ellipsoid, 14-20 X 6-9 fi. 



On trees and old wood, Louisiana and California. 



4. Rinodina lepida (Nyl.) Mull. Arg., Flora 64:515. 1881. 



Lecanora lepida Nyl, Mem. Soc. Imp. Sci. Nat. Cherb. 5:115. 1857. R. flavoni- 

 gella Tuck. 



Thallus thin, chinky to wrinkled, minutely granulose, greenish yellow to lemon- 

 colored; apothecia small to middle-sized, 0.4-1 mm. across, closely adnate, the 

 disk flat to slightly convex, brownish black to black, the margin thin, colored like 

 the thallus, becoming crenulate; hypothecium yellowish; spores ellipsoid to 

 oblong-ellipsoid, 20-31 X 9-14 /*. 



On trees and old wood, Georgia, Florida, and Alabama. 



5. Rinodina milliaria Tuck., Proc. Am. Acad. 12:175. 1877. 



Thallus thin, chinky, minutely granulose, greenish gray to greenish brown or 

 green; apothecia minute, 0.15-0.3 mm. across, adnate, numerous, the disk flat to 

 convex, blackish brown to black, the exciple thin, colored like the thallus or be- 

 coming black; hypothecium dark brown; spores oblong-ellipsoid, slightly constricted 

 at the septum, 9-15 X 5-8 [x. 



On trees, New England, New York, and Pennsylvania. 



