d
or even larger, 0.4 to 1.5 mm. in diameter, commonly scattered,
brown-black to black, rarely and obscurely white-pruinose, adnate to
sessile, rounded to flexuous, flat or finally convex, the raised exciple
sometimes becoming covered; hypothecium dark brown; hymenium pale below
and colored above; paraphyses distinct or coherent-semidistinct; asci
clavate; spores ovoid- to oblong-ellipsoid, 14 to 20 mic. long and 6 to
10 mic. wide.

Collected in Ross and Hocking Counties. On rocks. Not previously
reported from Ohio.

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.

_Micarea prasina_ Fr. Syst. Orb. Veg. 257. 1825.

Thallus of minute, closely clustered or even heaped granules, these
forming a wide-spread, frequently sublep