Thallus granulose, passing into chinky, verrucose, subareolate and subsquamulose conditions, seldom or never disappearing; apothecia minute to large, adnate or rarely immersed more or less, exciple usually weak and becoming covered; hypothecium commonly some shade of yellow or brown; hymenium pale to light brown; spores hyaline, acicular, varying from 4- to 16-celled, often curved or variously twisted, usually 8 in each ascus. KEY TO THE SPECIES OF BACIDIA On rocks. Spores hamate or spirally twisted 7. B. _umbrina_ Spores straight or only slightly curved. Thallus ash- or green-gray 5. B. _inundata_ Thallus olive or darker 1. B. _egenuloidea_ On bark. Spores less than 40 mic. in length 6. B. _incompta_ Spores 40 to 70 mic. long. Apothecia flesh-yellow to red-brown 2. B. _rubella_ Apothecia brown to black. Apothecia usually brown with a striate, usually pruinose margin 3. B. _fuscorubella_ Apothecia usually black Of dark brown, without striate and pruinose margin 4. B. _schweinitzii_ 1. Bacidia egenuloidea sp. nov. Thallus of minute, crowded granules, forming a rather thick, conspicuous, rugose and obscurely chinky, dirt-olive and darkening, wide-spread crust; apothecia minute to small, 0.25 to 0.4 mm. in diameter, yellow-brown and darkening, adnate-sessile, flat with an elevated, darker exciple; hypothecium and hymenium pale or tinged brown; paraphyses coherent, semi-distinct; asci clavate; spores hyaline obscurely several-celled, variously curved, 25 to 40 mic. long and 0.75 to 1.25 mic. wide. Collected in Preble County. On granite in a damp field near West Alexandria. The type specimen is deposited in the writer's herbarium, and a cotype may be found in the State Herbarium. 2. Bacidia rubella (Hoffm.) Mass. Ric. Lich. 118. f. 231. 1852. _Verrucaria rubella_ Hoffm. Deutsch. Fl. 2: 174. 1795. Thallus of minute, scattered or crowed granules, these frequently becoming compacted into a subleprose or more or less verrucose or chinky, ash- to green-gray, moderately thick or thinner, continuous or sometimes scattered and disappearing crust (Fig. 2); apothecia small to large, 0.5 to 1.35 mm. in diameter, sessile to adnate, flesh-yellow to red-brown, flat with a rather thick and lighter-colored exciple, or becoming convex with the exciple finally covered; hypothecium pale yellow to brown; hymenium pale yellow; paraphyses coherent, semi-distinct to indistinct; asci long clavate; spores about 8- to 16-celled, 45 to 65 mic. long and 3 to 4 mic. wide. Collected in Butler, Highland, Adams, and Preble counties. Also examined from Franklin County. On bark. Widely distributed in Ohio, but not common. 3. Bacidia fuscorubella (Hoffm.) Arn. Flora 54: 55. 1871. _Verrucaria fuscorubella_ Hoffm. Deutsch. Fl. 2: 175. 1795.