KEY TO THE SPECIES OF BACIDIA

On rocks.
Spores hamate or spirally twisted7. B. umbrina
Spores straight or only slightly curved.
Thallus ash- or green-gray5. B. inundata
Thallus olive or darker1. B. egenuloidea
On bark.
Spores less than 40 mic. in length6. B. incompta
Spores 40 to 70 mic. long.
Apothecia flesh-yellow to red-brown2. B. rubella
Apothecia brown to black.
Apothecia usually brown with a striate, usually
pruinose margin3. B. fuscorubella
Apothecia usually black Of dark brown, without striate
and pruinose margin4. 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.