THE ASCOMYCETES OF OHIO IV 
337 
crowded, rounded or variously irregular, black but usually dark red when 
damp, flat or slightly convex, the thin exciple raised and persistent; 
hypothecium light or darker brown; hymenium pale or tinged brown; 
paraphyses semi-distinct to coherent-indistinct; asci cylindrico-clavate; 
spores oblong-ellipsoid, 3 to 5 mic. long and 1 to 1.5 mic. wide. 
Collected in Butler, Adams, Montgomery, Hocking, and Ross counties. 
On limestone. Not previously reported from Ohio, but probably frequent 
where there is limestone, though inconspicuous and easily overlooked. 
2. Biatorella pruinosa (J. E. Smith) Mudd Man. Brit. Lich. 191. 1861. 
Lichen pruinosus J. E. Smith in Sowerby, Eng. Bot. 32: pi. 2244 1811. 
Thallus light colored, usually thin and smooth, rarely disappearing; 
apothecia minute to middle-sized, 0. 2 to 1 mm. in diameter, adnate 
scattered or crowded, flat or slightly convex, the disk pruinose, and the 
exciple persistent; hypothecium lighter or darker brown; hymenium usually 
pale; paraphyses coherent and becoming indistinct; asci cylindrico-clavate; 
spores oblong-ellipsoid, 3 to 5 mic. long and 1 to 1.5 mic. wide. 
Collected in Butler and Adams counties. On limestone. Not pre¬ 
viously reported from Ohio, but often occurring with the last in limestone 
areas. 
Lecidea Ach. Meth. Lich. XXX. 32. pi. 2. f. 1, 2. 1803. 
Thallus smooth, roughened, or verrucose, in some species chinky to 
areolate, or even subsquamulose, rarely rudimentary and evanescent; 
apothecia minute to middle-sized, usually adnate, but rarely sessile or 
immersed, with' pale to black, and flat to strongly convex disk; exciple and 
hypothecium from pale to dark brown in section; hymenium lighter, 
most commonly pale; spores simple, hyaline, 8 in each ascus. 
KEY TO THE SPECIES OF LECIDEA 
Exciple soft, usually light colored. 
Apothecia usually surrounded by a thalloid veil . coarciata 
Apothecia not surrounded by a thalloid veil. 
Exciple becoming covered. 
Hypothecium pale or pale yellow. 
Apothecia always minute. 
Spores 5 to 7 mic. long.2. L. intropallida 
Spores 7 to 15 mic. long.3. L. varians 
Apothecia reaching middle size.4. L. rupestris 
Hypothecium light-brown to dark brown. 
Thallus gray-green or lighter.5. L. viridescens 
Thallus darker from the first or becoming so. 
Thallus minute and evanescent.6. L. humicola 
Thallus well developed and persistent. 
Thallus of raised granules. 7. L. uliginosa 
Thallus of flat granules ..8. L. salvicola 
Exciple persistent.9. L. flexuosa 
Exciple horny, dark colored. 
Disk usually convex, commonly on wood.10. L. enteroleuca 
Disk flat or less commonly convex, on rocks. 
Disk usually white-to rusty-green-pruinose.11. L. albocaerulescens 
Disk black, scarcely pruinose..12. L. platycarpa 
