Exciple soft, usually light colored. Apothecia usually surrounded by a thalloid veil 1. L. _coarctata_ Apothecia not surrounded by a thalloid veil. Exciple becoming covered. Hypothecium pale or pale yellow. Apothecia always minute. Spores 5 to 7 mic. long 2. L. _intropallida_ Spores 7 to 15 mic. long 3. L. _varians_ Apothecia reaching middle size 4. L. _rupestris_ Hypothecium light-brown to dark brown. Thallus gray-green or lighter 5. L. _viridescens_ Thallus darker from the first or becoming so. Thallus minute and evanescent 6. L. _humicola_ Thallus well developed and persistent. Thallus of raised granules 7. L. _uliginosa_ Thallus of flat granules 8. L. _sylvicola_ Exciple persistent 9. L. _flexuosa_ Exciple horny, dark colored. Disk usually convex, commonly on wood 10. L. _enteroleuca_ Disk flat or less commonly convex, on rocks. Disk usually white- to rusty-green-pruinose 11. L. _albocaerulescens_ Disk black, scarcely pruinose 12. L. _platycarpa_ 1. Lecidea coarctata (J.E. Smith) Nyl. Act. Soc. Linn. Bord. 21: 358. 1856. _Lichen coarctatus_ J.E. Smith in Sowerby, Eng. Bot. 8: pl. 534. 1789. Thallus of minute, scattered or clustered, rounded, angular, or minutely and irregularly crenate, green-gray, pale brown, or more commonly ash-white granules, sometimes passing into a subcontinuous, chinky or areolate crust; apothecia minute to small, 0.2 to 0.4 mm. in diameter, adnate, from flesh-colored to black, commonly concave or flat, sometimes difform, frequently surrounded laterally by a thalloid veil; hypothecium and hymenium pale to pale brown; paraphyses distinct; asci clavate or cylindrico-clavate; spores ovoid to ellipsoid, 13 to 23 mic. long and 7 to 10 mic. wide. Collected in Lake, Ross, Hocking, and Preble counties. Also examined from Lawrence County. On rocks and old bricks. Not previously reported from Ohio. Widely distributed in the State, but rare, except in Lake County, where this fungus was unusually common. 2. Lecidea intropallida sp. nov. Thallus a continuous, smooth or slightly roughened, ash-gray and darkening crust; apothecia minute, 0.15 to 0.25 mm. in diameter, adnate or partly immersed, flesh-colored to yellow-brown, flat to slightly convex, the concolorous and inconspicuous exciple soon covered; hypothecium and hymenium pale; paraphyses sometimes distinct, but more commonly coherent-indistinct; asci clavate; spores simple, hyaline, ellipsoid, 5 to 7 mic. long and 2.5 to 3 mic. wide. Collected near Painesville in Lake County. On pebbles in a moist wood. The type specimen is deposited in the writer's herbarium, and a cotype may be seen in the State Herbarium.