126. Bacidia] 33. LECIDEACEAE 227 



E. Thallus granulose, powdery or chinky-areolate 

 F. Apothecia not more than 0.5 mm. across 



G. Disk light pink to pale reddish 2. B. albescens 



G. Disk yellowish to reddish or finally 



leaden-brown 4. B. stigmatella 



F. Apothecia 0.8-1.2 mm. across 5. B.Herrei 



D. Hypothecium hyaline to yellowish or brownish 

 E. Apothecia not more than 1 mm. across 

 F. Thallus ashy to whitish 



G. Apothecia always black 11. B.akompsa 



G. Apothecia brownish to blackish 12. B. bacillifera 



F. Thallus greenish gray to greenish or brownish 



G. Thallus scurfy or powdery IS. B.effusa 



G. Thallus coarsely granulose 13. B.chlorantha 



E. Apothecia 1-2.5 mm. across 9. B. subgranulosa 



C. Spores rarely less than 40 n in length 

 D. Hypothecium hyaline 



E. Disk flesh- to rose-colored, sometimes obscurely 



pruinose 3. B. rosella 



E. Disk yellowish to reddish brown 1. B. leucophyllina 



D. Hypothecium hyaline to yellowish or brownish to darker 

 E. Disk light brown or reddish to brown or black 

 F. Apothecia rarely less than 0.6 mm. across 

 G. Disk pale brown or reddish to darker and 



black; spores 40-75 X 3-4 n 17. B. fuscorubella 



G. Disk reddish yellow to reddish brown or 



obscurely white-pruinose; spores 45-65 X 3-4 fi . 16. B.luteola 



F. Apothecia 0.2-0.6 mm. across 19. B.arceutina 



E. Disk dark brown to black 



F. Apothecia rarely more than 0.8 mm. across 



G. Spores 30-60 X 2.5-4.5 /j. 14. B. atrogrisea 



G. Spores 60-80 X 4-5 /m 18. B. dementis 



F. Apothecia 0.6-1.75 mm. across 21. B . Schweinitzii 



A. Hypothecium brownish or reddish brown to brownish black 

 B. On trees and old wood 



C. Spores rarely more than 40 n in length 



D. Thallus very thin and inconspicuous 24. B.endocyanea 



D. Thallus scurfy or powdery to granulose 



E. Hypothecium reddish brown 25. B.incompta 



E. Hypothecium blackish brown 



F. Spores 1-3-septate 23. B. chlorosticta 



F. Spores 3-7-septate '. . . 26. B. Jacobi 



C. Spores rarely less than 40 fi in length 

 D. Apothecia less than 1 mm. across 



E. Spores 5-9-septate 27. B.abductans 



E. Spores 15-29-septate 29. B.dryina 



D. Apothecia 1.5-2.5 mm. across 28. B.suffusa 



B. On soil, moss, rocks, and other lichens, rarely on trees 



C. Spores 25-40 X 2-3 n 20. B.muscorum 



C. Spores 35-85 X 3-4 /x 30. B. flavovirescens 



1. Bacidia leucophyllina (Nyl. ) Fink n. comb. 



Lecidea leucophyllina Nyl., Ann. Sci. Nat. Bot. IV. 19:347. 1863. Biatora 

 leucophyllina (Nyl.) Tuck. Psorella leucophyllina (Nyl.) Zahlbr. 



Thallus composed of minute, irregular, greenish gray to whitish granules; 

 apothecia small, 0.3-0.5 mm. across, adnate, the disk flat to convex, yellowish to 

 reddish brown, the exciple thin, colored like the disk; hypothecium hyaline; spores 

 8, hyaline, acicular, slightly curved, 7-9-septate, 38-60 X 2-4 /jl. 



On trees, Florida. 



2. Bacidia albescens Zwackh., Flora 45:495. 1862. 



Thallus thin, minutely granulose or powdery, greenish gray to whitish, some- 

 times indistinct; apothecia minute to small, 0.15-0.5 mm. across, sessile, often 

 numerous, the disk flat to convex, light pink to pale reddish, the exciple paler, 



