119. Lecidea] 33. LECIDEACEAE 201 



soon disappearing; hypothecium hyaline; spores short-ellipsoid to subspherical or 

 spherical, 5-10 X 4-8 /x. 



On trees, New York, Michigan, Washington, and California. 



43. Lecidea subplebeia Nyl.; Hasse, Bull. Torr. Club 24:447. 1897. 



Thallus widespread, powdery, chinky-areolate, sometimes slightly wrinkled, ashy 

 to whitish; apothecia minute to small, 0.25-0.6 mm. across, closely adnate, the 

 disk flat to slightly convex, black, the exciple also black, thin; hypothecium dusky 

 or paler; spores ovoid-ellipsoid, 9-12 X 6-7 [i. 



On adobe soil and small pebbles, southern California. 



44. Lecidea tennessensis Nyl., Lich. Lab. Sing. 41. 1891. 



Thallus chinky-areolate, ashy gray to whitish, the areoles becoming more or 

 less orbicular, swollen and convex, limited by the black hypothallus; apothecia 

 small to middle-sized, 0.4-0.9 mm. across, partly immersed to closely adnate, 

 becoming variously irregular, the disk flat, black, the exciple also black, thick, 

 becoming wavy, rarely disappearing; hypothecium hyaline; spores short-ellipsoid 

 to ellipsoid, 7-11 X 4.5-6 \x. 



On sandstone, Tennessee. 



45. Lecidea cyanea (Ach.) Rohling, Deutschl. Fl. 3:32. 1813. 



L. lapicida var. cyanea Ach., Meth. Lich. 38. 1803. L. tessellata (Ach.) Floerke. 

 L. spilota E. Fries. 



Thallus more or less roughened, chinky-areolate, in round areas or irregularly 

 widespread, greenish gray to ashy, the hypothallus black; apothecia small to 

 middle-sized, 0.3-1 mm. across, or larger, immersed to adnate, the disk flat to 

 convex, slightly pruinose, soon black, the exciple also black, thin, raised, finally 

 curled-flexuous; hypothecium hyaline; spores ellipsoid, 8-12 X 4-7 fx. 



On rocks, widely distributed throughout the United States. 



46. Lecidea tessellina Tuck., Proc. Am. Acad. 12:181. 1877. 



Thallus rough, chinky-areolate, greenish gray, varying toward yellowish, the 

 areoles flat to sometimes convex, angular, the black hypothallus showing between 

 the areoles; apothecia minute to small, 0.2-0.7 mm. across, immersed in the areoles, 

 becoming confluent and irregular, the disk concave to slightly convex, black, the 

 exciple paler, thin, acute, often disappearing; hypothecium hyaline; spores ellip- 

 soid, 9-13 X 5-7 fx. 



On rocks, from New England to the Gulf, and westward to Kansas and 

 Nebraska, and also in Washington. 



47. Lecidea amylacea (Ach.) Tuck., Syn. N.A. Lich. 2:78, 79. 1888. 

 Lichen amylaceus Ach., Vet. Akad. Nya Handl. 2:191. 1794. 



Thallus thick, rough, continuous, becoming chinky to areolate, somewhat mealy, 

 pale yellow to white, the hypothallus black; apothecia middle-sized to large, 0.7- 

 1.8 mm. across, adnate, the disk flat, black, somewhat pruinose, the exciple black, 

 thick, raised, finally disappearing; hypothecium hyaline; spores ellipsoid, 7-10 X 



4-6 fi. 



On rocks, Utah, Montana, and California; doubtfully reported also from the 

 mountains of New Hampshire. 



48. Lecidea tenebrosa Flot; Nyl., Not. Sallsk. Faun. Flor. Fenn. 5:231. 1861. 

 Thallus rough, chinky, becoming areolate, the areoles distinct, smooth, slightly 



convex to swollen, pale green to blackish lead-colored, the hypothallus black; 

 apothecia minute to small, 0.3-0.6 mm. across, immersed to adnate, the disk flat, 

 black, the exciple also black, thin, rarely disappearing; hypothecium hyaline; spores 

 ellipsoid, 12-18 X 7-10 fi. 



On granite, New Hampshire. 



49. Lecidea Pringlei Tuck., Bull. Torr. Club 10:22. 1883. 



Thallus composed of crowded, erect, thick, dark green to blackening trunks, 

 the branches dilated above, often densely rough and folded and passing into 

 rootlike branches below; apothecia large, 1.5-5 mm. across, sessile, the disk flat 



