Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 | Page 3

most commonly pale; spores simple, hyaline, 8 in each ascus.
KEY TO THE SPECIES OF LECIDEA
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.
3. Lecidea varians Ach. Syn. Meth. Lich. 38. 1914.
Thallus of very minute, raised or flattened, green-gray to yellow-green granules, these forming a thin but continuous, smooth or granulate-rugose, often chinky crust, usually bordered and often decussated by black lines; apothecia minute, 0.12 to 0.25 mm. in diameter, often clustered or even conglomerate, adnate, from pale yellow to brown and finally black, flat with a thin exciple to convex with covered exciple; hypothecium pale to pale yellow; hymenium pale below, but often yellow or blue-violet above; paraphyses usually coherent, distinct or indistinct; asci clavate; spores oviod-ellipsoid, 7 to 15 mic. long and 5 to 7.5 mic. wide.
Collected in Adams County. On maple bark. Also reported from Franklin County. The plant is so minute and inconspicuous as to be very difficult to detect and is probably distributed widely in the State.
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; spores oblong-ellipsoid, 9 to 12 mic. long and 4 to 5.5 mic. wide.
Collected on Little Mountain in Lake County, and in Hocking County. On logs in woods. Not previously reported from Ohio, and probably rare in the State.
6. Lecidea humicola (Ach.) comb. nov.
Lecidea uliginosa humicola Ach. Meth. Lich. 43. 1903.
Thallus of very minute inconspicuous and evanescent, brown-black granules; apothecia minute, 0.2