366 43. BUELLIACEAE [ 168. Buellia 



A. Parasitic on other lichens 



B. Spores 1 -septate 169. Buelliella 



B. Spores 3-septate 170. Leciocrapha 



A. Not parasitic on other lichens 

 B. Apothecia with proper excip'.e 



C. Spores 1-septate 168. Buellia 



C. Spores 3-septate 171. Buelliopsis 



B. Apothecia with thalloid exciple 172. Rinodina 



168. Buellia De Not., Giorn. Bot. Ital. 2 1 :195, 196. 1846. 



Thallus crustose, granulose, warty, or more commonly areolate, mainly above 

 the substratum, rudimentary and attached by hyphal rhizoids; apothecia hard, 

 immersed to sessile, the disk flat to convex, commonly black, the exciple of the 

 same color, soon disappearing; hypothecium brown to black or rarely tinged red- 

 dish; hymenium hyaline or brownish; paraphyses rarely branched, usually enlarged 

 and brownish toward the apex; asci clavate, broadly clavate, or cylindrical; spores 

 8 to rarely many, brown or rarely almost hyaline, 1-septate, ellipsoid to oblong- 

 ellipsoid. 



The algal host is Protococcus. 



A. On rocks and soil 



B. Thallus ashy to greenish or reddish brown or black 

 C. Spores rarely more than 18/z in length 



D. Thallus a more or less chinky-areolate crust 



E. Spores 8-13 X 4-6 ^ 22. B. turgescentoides 



E. Spores 12-18 X 5.5-9 ft 24. B. pullata 



D. Thallus of more or less scattered areoles 4. B.coracina 



C. Spores larger, usually more than 18 ft in length 



D. Spores 14-27 X 7-13 ft 18. B. colludens 



D. Spores 25-38 X H-17 ft 19. B. badioatra 



B. Thallus greenish gray, whitish, ashy, or yellowish 

 C. Thallus greenish gray to ashy 



D. Black hypothallus usually conspicuous 



E. Apothecia 0.4-0.8 mm. across, disk wrinkled or papillate . 16. B. spuria 

 E. Apothecia 0.2-0.5 mm. across, disk smooth 



F. Spores 9-14 X 3.5-6 ft 5. B.stigmaea 



F. Spores 10-19 X 5.5-8 ft 25. B. lepidastra 



D. Black hypothallus not conspicuous 

 E. Thallus minutely areolate or warty 



F. Thallus areolate, greenish gray to ashy . . . S. B. retrovertens 

 F. Thallus becoming rough and warty, milky white to 



greenish gray, sometimes subpruinose 6. B.Blumeri 



E. Thallus granulose or subsquamulose 21. B.bolacina 



C. Thallus yellowish, gray, or whitish 



D. Black hypothallus usually conspicuous 

 E. Apothecia 0.4-1 mm. across 



F. Thallus squamulose 29. B.pulchella 



F. Thallus chinky to areolate 3. B. halonia 



E. Apothecia smaller, 0.15-0.25 mm. across 2. B. stellulata 



D. Black hypothallus not conspicuous 



E. Apothecia 0.6-1 mm. or more across 



F. Thallus sulphur-yellow, becoming pale; spores 



14-27X7-10ai 7. B.semitensis 



F. Thallus whitish; spores 14-18 X 5.5-7.5 ft . . 23. B. tucsonensis 

 E. Apothecia rarely more than 0.6 mm. across 

 F. Thallus areolate to rarely granulose 

 G. Thallus thin, ashy to whitish 



H. Spores 10-18 X 5-8.5 ft 10. B. aethalea 



H. Spores 9-12 X 3-4.5 ft 9. B. insidians 



G. Thallus coarser, chinky, white-powdery or 



dirty orange 20. B. rinodinoides 



F. Thallus lobed 26. B.epigaea 



