358 
OHIO BIOLOGICAL SURVEY 
Examined from Butler, Preble, Clark, Adams, and Summit counties. 
Also reported from Champaign County. On earth and mosses, commonly 
about trees. Widely distributed in Ohio, but infrequent. 
6. Peltigera polydactyla ( Neck. ) Hoffm. Deutsch. FI. 2: 106. 1795. 
Lichen polydactylon Neck. Muse. 85. 1771. 
Thallus adnate at the center with ascendant margins of the lobes, 6 to 
11 cm. in diameter, the upper surface smooth and shining, devoid of trichc- 
matic hyphae, the lobes broad with crisped, crenate margins, except those 
bearing the apothecia, these much narrower and more elongated and usually 
digitately clustered, brown in color for the most part, the lower surface 
showing through a reticulation of dark veins as small light-colored spots, 
numerous dark rhizoids extending downward from the veins; medulla of 
densely interwoven and irregularly disposed hyphae; apothecia orbicular, 
and usually revolute, the disk dark brown, 3 to 10 mm. in diameter; 
hypothecium pale brown; hymenium pale below and dark brown above; 
asci clavate to cylindrico-clavate; spores acicular, straight or slightly 
curved, 4- to 6-celled, 42 to 70 mic. long and 3 to 4 mic. wide. 
Examined from Clark, Fairfield, and Morgan counties. On earth. 
Rare in Ohio. 
7. Peltigera horizontalis (L.) Hoffm. Deutsch. El. 2: 107. 1795. 
Lichen horizontalis L. Mant. PI. 2:132. 1771. 
Thallus mostly adnate, the margins scarcely ascending, 6 to 20 cm. 
in diameter, the upper surface smooth and shining, devoid of trichomatic 
hyphae, green-gray to brown, the lobes broad and rounded with entire or 
crenate margins, the lower surface covered with numerous veins, these 
giving a dark coloration toward the center and becoming light colored 
toward the margins, numerous dark rhizoids extending down from the 
veins; medulla of thick-walled, densely and irregularly disposed hyphae; 
apothecia on somewhat narrowed lobes, transversely oblong or infrequently 
orbicular, the disk red-brown, concave, 2 to 4 mm. in diameter; hypothe¬ 
cium light brown; hymenium pale below and dark brown toward the upper 
surface; asci cylindrico-clavate; spores fusiform to long-ellipsoid, straight to 
curved, 4-celled, 26 to 40 mic. long and 5 to 6.5 mic. wide. (Fig. 8 a). 
Examined from Lake and Fairfield counties. On earth and mossy 
rocks. Rare in Ohio. 
Nephroma Ach. Lich. Univ. 101. 521. pi. 11. f. 1. 1810. 
Thallus foliose, but smaller and thinner than that of Peltigera, and 
devoid of trichomatic hyphae, more or less closely attached to the sub¬ 
stratum by rhizoids; cortex well developed on both upper and lower sides; 
medulla well developed (Fig. 2); apothecia confined to the lower side of the 
thallus, marginal on narrow, slightly elongated lobes, thalloid margin per¬ 
sistent and crenate; hypothecium usually some shade of brown; hymenium 
