June, 1912.] Lichens of Northern Ohio. 547 



Peltigera 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 . 

 Peltigera 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 2G 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, hickorv, ironwood, oak, thorn, wild cherry) : 



C16 G 2 L 7 O 2 S 3. 

 Pertusaria velata (Turn.) Nvl. On bark (Ash, hickorv, maple): 



012 G 3 S 3. 

 Physcia adglutinata (Floerke) Nyl. On bark (Basswood, hickory, 



maple, oak, willow) : C 8 E 1 2. 

 Phvscia aguila detonsa (Fr.) Tuck. On bark ( Beech, birch,) : on 



" old bark and moss over old bark: C18E2L1M3S2. 

 Phvscia hvpoleuca (Ach.) Tuck. On bark (Maple, willow) and 



' on old bark: Cll E 2 M 3. 

 Physcia obscura (vSchaer.) Nyl. On bark (Ash, basswood, elm, 



hickorv, maple, poplar, willow) ; on rock and over moss on 



bark and rock: C12 E 2 O 2 St 1. 

 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 O 2 St 1. 

 Physcia stellaris (L.) N}'!. On bark (Apple, ash, elm, maple, 



oak, poplar, red cedar, willow) and on rock: C 40 E 15 G 4 



M 1 06P3S2St 1. 

 Physcia tribacia (Ach.) Nyl. On bark (Apple, crab-apple, 



hickory, maple, sycamore, thorn, wild cherrv, willow) : 



C 9 E 4 G 1 O 2. 

 Placodium aurantiacum (Lightf.) Hepp. On limestone, on sand- 

 stone and on dead bark: C 6 E 1 2. 

 Placodium cerinum (Hoffm.) Hepp. On bark (Ash, hickory, 



maple, oak, willow) : C 5 E 1 M 1 2. 

 Placodium vitellinum (Hoffm.) Hepp. On sandstone: C 2 G 1. 

 Pvrenula cinerella (Plot.) Fink. On bark (Birch, hemlock, oak, 



wild cherry): C7L302S 1. 

 Pyrenula leucoplaca (Wallr.) Koerb. inch var. pluriloculata, Fink. 



On bark (Beech, birch, maple, oak, wild cherry) : C (5 L 2. 



