align="left">The disk of the apothecium white-pruinose

1. Biatorella simplex (Dav.) Br. & Rostr. Bot. Tidssk. 3: 241 1869.

Lichen simplex Dav. Trans. Linn. Soc. Lond. 2: 283 pl. 28. f. 2. 1794.

Thallus thin and smooth or thicker and roughened, sometimes subareolate, ash-white to green-gray and darkening, rarely disappearing; apothecia minute to middle-sized, 0.2 to 0.8 mm. in diameter, adnate, scattered or crowded, rounded or variously irregular, black but usually dark red when damp, flat or slightly convex, the thin exciple raised and persistent; hypothecium light or darker brown; hymenium pale or tinged brown; paraphyses semi-distinct to coherent-indistinct; asci cylindrico-clavate; spores oblong-ellipsoid, 3 to 5 mic. long and 1 to 1.5 mic. wide.

Collected in Butler, Adams, Montgomery, Hocking, and Ross counties. On limestone. Not previously reported from Ohio, but probably frequent where there is limestone, though inconspicuous and easily overlooked.

2. Biatorella pruinosa (J.E. Smith) Mudd Man. Brit. Lich. 191. 1861.

Lichen pruinosus J.E. Smith in Sowerby, Eng. Bot. 32: pl. 2244 1811.

Thallus light colored, usually thin and smooth, rarely disappearing; apothecia minute to middle-sized, 0.2 to 1 mm. in diameter, adnate scattered or crowded, flat or slightly convex, the disk pruinose, and the exciple persistent; hypothecium lighter or darker brown; hymenium usually pale; paraphyses coherent and becoming indistinct; asci cylindrico-clavate; spores oblong-ellipsoid, 3 to 5 mic. long and 1 to 1.5 mic. wide.

Collected in Butler and Adams counties. On limestone. Not previously reported from Ohio, but often occurring with the last in limestone areas.

Lecidea Ach. Meth. Lich. XXX. 32. pl. 2. f. 1, 2. 1803.

Thallus smooth, roughened, or verrucose, in some species chinky to areolate, or even subsquamulose, rarely rudimentary and evanescent; apothecia minute to middle-sized, usually adnate, but rarely sessile or immersed, with pale to black, and flat to strongly convex disk; exciple and hypothecium from pale to dark brown in section; hymenium lighter, most commonly pale; spores simple, hyaline, 8 in each ascus.

KEY TO THE SPECIES OF LECIDEA

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