k, subcontinuous, verrucose crust, but more
often scattered or disappearing entirely; apothecia minute to small,
0.25 to 0.7 mm. in diameter, scattered or conglomerate, dirty brown to
black, soon becoming convex and subglobose, with the pale exciple then
covered; hypothecium pale to pale red-brown; hymenium pale; asci clavate
to inflated-clavate; paraphyses coherent-indistinct; spores fusiform,
4-celled, 16 to 25 mic. long and 4 to 6 mic. wide.

Collected in Hocking County. On shaded sandstone. Not previously
reported from North America.

6. Bilimbia trachona (Ach.) Oliver Lich. France 38,39. 1903.

_Verrucaria trachona_ Ach. Meth. Lich. Suppl. 16. 1803.

Thallus thin and granular, passing into smooth or leprose conditions,
thence to thickened and subareolate states, ash-colored to dark
brown-green, usually continuous over considerable areas; apothecia
minute to middle-sized, 0.4 to 0.1 mm. in diameter, from brown-black
with lighter exciple to wholly black, adnate or somewhat immersed, flat
or finally convex with the exciple at length covered; hypothecium pale
brown to black-brown; hymenium pale or rarely pale brown; paraphyses
distinct to coherent semi-distinct; asci clavate; spores
fusiform-dactyloid, 4-celled, 12 to 20 mic. long and 2.5 to 4.5 mic.
wide (Fig. 5).

Collected in several localities in Preble, Highland, and Adams counties.
On rocks, usually limestone. Also reported from Cuyahoga and Ottawa
counties. Not common, but doubtless distributed widely in the State.

Bacidia De Not. Giorn. Bot. Ital. 2: 189. 1846.

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