Biatorina Mass. Ric. Lich. 134. f. 262-271. 1852.
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.