356 
OHIO BIOLOGICAL SURVEY 
1. Peltigera aphthosa (L.) Willd. FI. BeroL Prodr. 347. 1787. 
Lichen aphthosus L. Sp. PI. 1148. 1753. 
Thallus closely attached to the substratum at the center, the lobes 
ascending, 6 to 8 cm. in diameter, smooth and devoid of trichomatic hyphae 
above, cephalodia more or less rounded and irregularly scattered over the 
surface (Fig. 3), the lobes broad and rounded with crenate margins, 
brown above, the lower surface having numerous veins, these forming a 
dark brown nap at the center, the veins distinct and light toward the 
margin, dark rhizoids extending from the veins; medulla composed of thick- 
walled, densely interwoven hyphae, irregularly disposed; apothecia on 
extended lobules, orbicular and frequently revolute, the disk red-brown, 2 
to 5 mm. in diameter, the margin entire or crenulate; hypothecium pale 
brown; hymenium hyaline to pale brown above; asci cylindrico-clavate; 
spores acicular, straight, 4-to 6-celled, 47 to 66 mic. long and 4 to 5 mic. 
wide (Fig. 8, d). 
Examined from Clark County. Also reported from Champaign 
County. On earth and often on humus-covered rocks. Rare in Ohio. 
2. Peltigera praetextata (Sommerf.) Fink. Proc. Ind. Acad. Sci. 1918: 
267. 1918. 
Peltigera ulorrhiza praetextata Sommerf. Lapp. Suppl. 123. 1826. 
Thallus adnate toward the center, more or less ascending toward the 
margins, 7 to 15 cm. in diameter, the upper surface having isidioid branch- 
lets or lobules scattered more or less thickly, the lobes broad, wavy, 
crenate, with frequently isidioid, lobulate margins, trichomatic hyphae 
often present, usually green-gray toward the center, becoming brown toward 
the margin, the lower surface light with numerous dark veins and bearing 
rhizoids of the same color, the veins and rhizoids becoming light colored 
toward the margin; medulla of densely interwoven and irregularly dis¬ 
posed hyphae; apothecia on narrow, somewhat extended lobes, the disk 
brown to brown-black, revolute, 2 to 5 mm. in diameter, hypothecium 
light to darker brown; hymenium pale below and brown above; asci cylin¬ 
drico-clavate; spores sub-fusiform to acicular, usually straight but some¬ 
times slightly curved, 4-to 6-celled, 42 to 56 mic. long and 3 to 5 mic. wide. 
Examined from Eranklin, Adams, Butler, Marion, Jefferson, and Preble 
counties. On soil, old logs, and moss in woods. Not previously reported 
from Ohio, but included under Peltigera canina and Peltigera rufescens. 
Evidently widely distributed and frequent in the State, but seldom fruited. 
3. Peltigera sorediata (Schaer. ) Eink 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 
