June, 1912.] 
Lichens of Northern Ohio. 
547 
Pcltigera canina (L.) Hoffm. On earth, rock and bark: C 12 
G 1 P 1. 
P. canina spuria (Ach.) Tuck. With moss on old wood and bark 
and on earth : C 3 E 1 . 
Pcltigera horizontalis (L.) Hoffm. Over moss and decayed 
leaves ; on earth and on rock : C 6 L 1 . 
Peltigera polydactyla (Neck.) Hoffm. Over moss on earth and 
rock: C 3. 
Pertusaria communis Lam. & DC. On bark (Ash, beech, birch, 
hickory, maple) and on rock: C 26 G 2 L 4 M 1 O 1 S 2. 
Pertusaria leioplaca (Ach.) Schaer. On bark (Maple) : C 3 E 1 L 1. 
Pertusaria multipuncta (Turn.) Nyl. On bark (Hickory): 
C2E 1 02. 
Pertusaria pustulata (Ach.) Nyl. On bark (Alder, apple, ash, 
birch, chestnut, hickory, ironwood, oak, thorn, wild cherry) : 
C 16 G 2 L 7 O 2 S 3. 
Pertusaria velata (Turn.) Nyl. On bark (Ash, hickorv, maple): 
C 12 G 3 S 3. 
Physcia adglutinata (Floerke) Nyl. On bark (Basswood, hickory, 
maple, oak, willow) : C8E 1 02. 
Physcia aguila detonsa (Fr.) Tuck. On bark ( Beech, birch, ) : on 
old bark and moss over old bark: C18E2L1M3S2. 
Physcia hypoleuca (Ach.) Tuck. On bark (Maple, willow) and 
* on old bark: C 1 1 E 2 M 3. 
Physcia obscura (Schaer.) Nyl. On bark (Ash, basswood, elm, 
hickory, maple, poplar, willow) ; on rock and over moss on 
bark and rock : Cl2E202Stl. 
P. obscura endochrysea (Hampe) Nyl. On bark (Willow): C 1. 
Physcia speciosa (Wulf.) Nyl. On bark (Elm, poplar); on fence 
rail; on boulder; on moss over old bark and rock: C 8 E 2 
G 1 M 2 0 2 St 1. 
Physcia stellaris (L.) Nyl. On bark (Apple, ash, elm, maple, 
oak, poplar, red cedar, willow) and on rock: C 40 E 15 G 4 
M 1 O 6 P 3 S 2 St 1. 
Physcia tribacia (Ach.) Nyl. On bark (Apple, crab-apple, 
hickorv, maple, sycamore, thorn, wild cherrv, willow) : 
C9E4G102. 
Placodium aurantiacum (Lightf.) Hepp. On limestone, on sand- 
stone and on dead bark: C 6 E 1 O 2. 
Placodium cerinum (Hoffm.) Hepp. On bark (Ash, hickory, 
maple, oak, willow) : C 5 E 1 M 10 2. 
Placodium vitellinum (Hoffm.) Hepp. On sandstone: C 2 G 1. 
Pyrenula cinerella (Flot.) Fink. On bark (Birch, hemlock, oak, 
wild cherry) : C7L302S1. 
Pyrenula leucoplaca (Wallr.) Koerb. inch var. pluriloeulata, Fink. 
On bark (Beech, birch, maple, oak, wild cherry) : C 6 L 2. 
