from Butler, Franklin, Ashtabula, Green, Seneca, Summit,
Lorain, Preble, Brown, and Adams counties. On soil or mosses in woods.
Generally distributed and frequent in Ohio.

5. Peltigera rufescens (Neck.) Hoffm. Deutsch. Fl. 2: 107. 1795.

_Lichen rufescens_ Neck. Meth. Musc. 79. 1771.

Thallus closely adnate at the center with ascending lobes, 5 to 15 cm.
in diameter, the upper surface smooth and devoid of trichomatic hyphae
for the most part, but the margins sometimes sparingly covered with
them, green-gray to brown, the lobes crowded, rather small with crenate,
much crisped, elevated margins, the lower surface usually becoming dark
brown except at the margins, and thickly reticulated with brown veins,
from these numerous rhizoids of similar color extending; medulla of
densely interwoven variously disposed hyphae; apothecia numerous on
narrow, extending lobes, the disk brown to black-brown, revolute, 4 to 7
mm. in diameter; hypothecium pale brown; hymenium hyaline to pale brown
below and dark brown above; asci long-clavate; spores acicular, straight
or curved, 4- to 8-celled, 45 to 68 mic. long and 3.5 to 5 mic. wide.

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. Fl. 2: 106. 1795.

_Lichen polydactylon_ Neck. Musc. 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
trichomatic 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. Fl. 2: 107. 1795.

_L