370 43. BUELLIACEAE [168. Buellia 



ing black, the exciple thin and disappearing; hypothecium brown to blackish; 

 spores ellipsoid, 7—12 X 3-5 fi. 



On trees, from Florida to Texas. 



18. Buellia colludens (Nyl.) Arn., Flora 53:479. 1870. 



Lecidea colludens Nyl., Flora 53:38. 1870. Lecidea atroalba var. chlorospora 

 Nyl. B. atroalba Tuck. 



Thallus somewhat rough, chinky to areolate, greenish gray to reddish or 

 brownish, continuous or rarely scattered, surrounded by a black hypothallus; 

 apothecia small to middle-sized, 0.5-1.2 mm. across, subsessile, the disk flat, black, 

 the exciple black, raised, rarely crenulate; hypothecium dark brown; spores ellip- 

 soid, 14-27 X 7-13 /a. 



On rocks, from New England to Florida, and westward to Tennessee and Ohio. 



19. Buellia badioatra (Floerke) Koerb., Syst. Lich. 223. 1855. 



Lecidea badioatra Floerke, in Spreng., Neu. Entd. 2:95. 1821. Rhizocarpon 

 badioatrum (Floerke) T. Fries. 



Thallus chinky-areolate, the areoles becoming strongly convex, scattered upon 

 the blackish hypothallus or crowded into a crust, gray to brownish or reddish 

 brown; apothecia small to middle-sized, 0.3-0.75 mm. across, slightly immersed 

 to adnate, the disk flat to slightly convex, black, the exciple black, sometimes 

 inconspicuous; hypothecium brown to blackish; spores oblong-ellipsoid, 25-38 X 

 ll-17/i, surrounded by a halo. 



On rocks, Minnesota and New Hampshire. 



20. Buellia rinodinoides Anzi, Atti Soc. Ital. Sci. Nat. 253. 1866. 



Thallus coarsely chinky and areolate, the areoles flat to convex, angular, white- 

 powdery, sometimes becoming dirty orange-colored; apothecia minute to small, 

 0.2-0.5 mm. across, immersed to superficial, often clustered, the disk flat to convex, 

 black, the exciple black, thin, disappearing; hypothecium dark brown; spores 

 ellipsoid, 9-15 X 5-8 /*. 



On rocks, California. 



21. Buellia turgescens (Nyl.) Tuck., Gen. Lich. 185. 1872. 

 Lecidea turgescens Nyl., Mem. Soc. Sci. Nat. Cherb. 5:337. 1857. 



Thallus chinky, warty, and commonly areolate, or the swollen warts often 

 crowded into a more or less folded crust, brownish ashy varying to reddish or 

 yellowish; apothecia minute to small, 0.2-0.6 mm. in diameter, partly immersed 

 to adnate, the disk flat to convex, black, the exciple thin, black, and sometimes 

 disappearing; hypothecium dark brown; spores ellipsoid, 9-15 X 4.5-7 p.. 



On old wood and rocks, from New England to Illinois and Minnesota, and 

 recurring in Washington. 



22. Buellia turgescentoides Fink, Ohio Biol. Surv. 2:349. 1921. 



Thallus thick, flat to warty, chinky to areolate, scattered or crowded into a 

 crust, dull greenish brown and darkening, the marginal lobules sometimes lobulate; 

 apothecia minute to small, 0.2-0.5 mm. across, immersed to adnate, scattered or 

 clustered, the disk flat to convex, black, the exciple black, thin, and disappearing; 

 hypothecium pale to darker brown; spores oblong-ellipsoid, 8-13 X 4-6 /x. 



On rocks, Lake County, Ohio. 



23. Buellia tucsonensis Zahlbr., Ann. Mycol. 7:477,478. 1909. 



Thallus thin, whitish, chinky to areolate, becoming warty and convoluted toward 

 the center, often scattered with lobed areoles toward the margins; apothecia small 

 to middle-sized, 0.6-1 mm. across, sessile, the disk flat to convex, brownish black, 

 the exciple thin, brownish black, and disappearing; hypothecium brown; spores 

 ellipsoid, 14-18 X 5.5-7.5 fx. 



On rocks, near Tucson, Arizona. 



