3. Peltigera sorediata (Schaer.) Fink comb. nov.
Peltigera canina spuria sorediata Schaer. Enum. Lich. Eur. 21. 1850.
Thallus small, composed of scattered lobes, these 1 to 4.5 cm. in length, adnate with slightly ascending rounded, and crenate margins, the upper surface usually deep gray at the center, becoming lighter toward the margin, thickly covered with trichomatic hyphae, orbicular sorediate areas scattered over the upper surface, the lower surface ash-white to cream-colored, with a network of veins of the same color, with similarly colored rhizoids extending downward; medulla of small, densely interwoven and irregularly extending hyphae; apothecia somewhat digitately clustered on the narrow lobes, small, 1.3 to 3 mm. in diameter, orbicular, flat or semi-revolute, dark brown; hypothecium light brown; hymenium hyaline below and brown above; asci long-clavate; spores acicular, 6- to 8-celled, 53 to 66 mic. long and 3 to 3.5 mic. wide ([Fig. 8], b).
Examined from Butler and Lake counties. On damp earth and mossy rocks. Not previously reported from Ohio, and probably not widely distributed in the State. Surely rare.
4. Peltigera canina (L.) Hoffm. Deutsch. Fl. 2: 108. 1795.
Lichen caninus L. Sp. Pl. 1149. 1753.
Thallus closely adnate toward center, the lobes more or less ascending, 6 to 15 cm. in diameter, the upper surface for the most part thickly covered with trichomatic hyphae, generally giving it a downy appearance under the lens, the lobes numerous and usually broad and rounded, with entire or crenate and much crisped margins, usually green-gray but sometimes becoming brown, below almost white, netted with light brown or gray veins, these bearing rhizoids of the same color; medulla ([Fig. 5]) of densely interwoven and irregularly disposed hyphae; apothecia on narrow, extended lobes, often erect, orbicular, usually revolute, 2 to 7 mm. in diameter, the disk dark brown; hypothecium ([Fig. 7]) pale brown; hymenium ([Fig. 6]) pale below and brown above; asci long-clavate; spores acicular, straight or sometimes curved, 4- to 8-celled, 30 to 65 mic. long and 3 to 5 mic. wide ([Fig. 8], d).
Examined 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.