Thallus commonly granulose, and often passing into verrucose and chinky conditions, but scarcely ever areolate, sometimes scant and evanescent; apothecia usually minute or small, and commonly adnate, exciple weak and often becoming covered; hypothecium and hymenium passing from pale through shades of brown, the former becoming darker than the latter, this rarely tinged blue or violet above; spores hyaline, 2-celled. KEY TO THE SPECIES OF BIATORINA Growing on another lichen 1. B. _heerii_ Growing on wood or on rocks. On old wood 2. B. _prasina_ On rocks. Exciple strong and seldom becoming covered 4. B. _chalybeia_ Exciple weak and usually becoming covered 3. B. _lentibularis_ 1. Biatorina heerii (Hepp) Fink Cont. Nat. Herb. 14: 83. 1910. _Biatora heerii_ Hepp, Spore Flecht. Eur. pl. 16. f. 135. 1853. Thallus of very minute, rounded and frequently heaped granules, sometimes visible under a hand lens, but often seen only in sections of the substratum, rarely disappearing; apothecia minute, 0.1 to 0.3 mm. in diameter, adnate to sessile, flesh-colored and blackening, flat to slightly convex, the concolorous or darker exciple commonly persistent; hypothecium and hymenium pale to light brown; paraphyses distinct to coherent-indistinct; asci clavate; spores ellipsoid, 7 to 12 mic. long and 3 to 3.5 mic. wide. Collected in Butler County. On the thallus of _Peltigera canina_. Not previously reported from Ohio. So minute as to be difficult to detect. Consequently nothing further is known of its distribution in the State. 2. Biatorina prasina (Fr.) Fink Cont. Nat. Herb. 14: 84. 1910. _Micarea prasina_ Fr. Syst. Orb. Veg. 257. 1825. Thallus of minute, closely clustered or even heaped granules, these forming a wide-spread, frequently subleprose, green-gray to dark-olive crust; apothecia minute to small, 0.2 to 0.5 mm. in diameter, adnate, commonly carneous or darkening, more or less convex and usually becoming convex with the exciple finally covered; hypothecium pale or pale brown; hymenium pale below and commonly darker above; paraphyses coherent, semi-distinct to indistinct; asci clavate; spores oblong-ellipsoid, 8 to 12 mic. long and 3.5 to 5 mic. wide. Collected on Little Mountain in Lake County. On a rotten log. Not previously reported from Ohio, and evidently rare in the State. Simple spores were seen in the specimens collected, but they were supposed to be immature. 3. Biatorina lentibularis (Ach.) Koerb. Syst. Lich. 191. 1855. _Lecidea lentibularis_ Ach. Syn. Meth. Lich. 28. 1814.