4. Lecidea rupestris (Scop.) Ach. Meth. Lich. 70. 1803. (See Fig. 10).

_Lichen rupestris_ Scop. Fl. Carn. ed. 2. 2: 363, 364. 1772.

Thallus a continuous, moderately thick, smooth or more or less
roughened, often chinky to subareolate, ash-gray, yellow-green, or
darkening crust; apothecia small to large, 0.4 to 1.3 mm. in diameter,
at first immersed but becoming adnate, yellow to yellow or red-brown,
flat to strongly convex and the exciple covered; hypothecium pale or
pale yellow; hymenium pale; paraphyses coherent, semi-distinct to
indistinct; asci clavate; spores ellipsoid, 10 to 15 mic. long and 5 to
7 mic. wide.

Collected in Adams Country. On calcareous rocks. Not previously reported
from North America.


5. Lecidea viridescens (Schrad.) Ach. Meth. Lich. 62. 1903.

_Lichen viridescens_ Schrad. Spic. Fl. Germ. 88. 1794.

Thallus of very minute, smooth or deliquescent and powdery, ash-grey to
grey-green granules, spread over the substratum as a thin or rarely
thicker crust; apothecia minute to small, 0.2 to 0.5 mm. in diameter,
adnate, frequently clustered or even conglomerate, becoming black, from
flat with the thin livid or darker exciple visible to convex with the
exciple covered; hypothecium pale or darker brown; hymenium pale to pale
brown; paraphyses coherent, semi-distinct to indistinct; asci clavate;