348 
OHIO BIOLOGICAL SURVEY 
flat or becoming convex, with a thin and frequently flexuous exciple; hypo- 
thecium pale brown to brown; hymenium pale below and pale brown above; 
paraphyses coherent, semi-distinct to indistinct; asci long-clavate; spores 
4- to 12-celled, 18 to 35 mic. long and 1.5 to 3 mic. wide. 
Collected in Adams County. On bark. Not previously reported from 
Ohio, and doubtless rare in the State. 
7. Bacidia umbrina (Ach.) Br. & Rostr. Bot. Tidssk. 3: 235. 1869. 
Lecidea umbrina Ach. Lich. Univ. 183. 1810. 
Thallus a rather thick and continuous, or rarely thinner and scattered, 
subleprose, chinky, rugose-granulate or subareolate, green-gray to dark 
olive-brown, sometimes largely disappearing crust; apothecia minute to 
small, 0.25 to 0.6 mm. in diameter, light brown to black, adnate to some¬ 
what immersed, at first flat with a commonly paler exciple, becoming con¬ 
vex with the exciple sometimes covered; hypothecium pale or darker brown; 
hymenium pale throughout, or tinged brown above; paraphyses coherent, 
semi-distinct to indistinct; asci long-clavate, or inflated-clavate; spores 
hamate, or more or less spirally twisted, about 4- to 8-celled, 18 to 30 mic. 
long and 2 to 3 mic. wide (Fig. 7). 
Collected in Preble, Lake, Hocking, and Adams counties. Also ex¬ 
amined from Wayne County. On various rocks. Not previously reported 
from Ohio, but evidently distributed widely in the State. 
Buellia De Not. Giorn. Bot. Ital. 21; 195. 1846. 
Thallus granulose, verrucose, or areolate, rather better developed than 
those of the preceding genera as shown in the more frequent verrucose and 
areolate conditions; apothecia minute to large, sessile to immersed, the 
disk and the exciple usually black; hypothecium usually brown; hymenium 
pale to light brown; paraphyses usually distinct; spores brown, 2-celled. 
KEY TO THE SPECIES OF BUELLIA 
On rocks .3. B. turgescenioides 
On wood, or on bark. 
On dead wood. .1. B. myriocarpa 
On bark ..2. B. parasema 
1. Buellia myriocarpa (Lam. & DC.) Mudd. Man. Brit. Lich. 217. 1861. 
Patellaria myriocarpa Lam. & DC. FI. ed. 3. 2: 346. 1805. 
Thallus a thin and scurfy, smooth or chinky, or thicker and roughened- 
verrucose, ash- to green-gray, or darkening crust, irregularly spread over 
small areas, and rarely disappearing; apothecia minute to small, 0.2 to 0.6 
mm. in diameter, often numerous, black, adnate, flat and bordered by an 
exciple, or becoming convex with the exciple sometimes covered; hypothe¬ 
cium dark brown; hymenium pale, or pale below and pale brown above; 
paraphyses distinct, but sometimes loosely coherent; asci clavate; spores 
oblong-ellipsoid, 7 to 16 mic. long and 4 to 7.5 mic. wide. 
