THE ASCOMYCETES OF OHIO IV 
345 
Nylander called the apothecium pale within, but forms with red-brown 
hypothecia are admitted by later writers. 
5. Bilimbia microcarpa Th. Fr. Bot. Not. 1863: 8. 1863. 
Bilimbia obscurata microcarpa Th. Fr. Nov. Act. Soc. Sci. Ups. HI. 3: 
183. 1861. 
Thallus of minute ash-gray or green-gray granules, these rarely form¬ 
ing a thin or moderately thick, 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 inflat- 
ed-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 slighly curved. 
Thallus ash- or green-gray. 5. B. inundata 
Thallus olive or darker ...1. B. egenuloidea 
