f 
P. tribacea (Ach.) Tuck. Cedar Hill, on Ulmus Americana. Conewago, on 
Juniperus Virginiana. 
Pyxine, Fr. 
P. SOrediata, Fr. Safe Harbor, on rocks. 
UMBTLICARIE.^. 
Umbilicaria, Hoffm. 
U. Dillenii, Tuck. Mt. Hope — Small ; McCall’s Ferry — Porter, Heller. 
U. pustulata (L.) Hoffm., var. papulosa, Tuck. McCall’s Ferry. 
U. VGllea (L.) Nyl. Tucquan — Small, 
PELTIGERIEiE. 
Sticta, Schreb. 
S. amplissima (Scop.) Mass. Tucquan, on rocks ; Mt Hope, on pine trees — 
Small ; Safe Harbor, on rocks. 
S. pulmonaria (L.) Ach. Mt. Hope — Small. 
S. quercizans (Michx.) Ach. Mt. Hope — Small; McCall’s Ferry; Safe Harbor, 
on rocks. 
Peltigera, Willd 
P. aphthosa (L.) Hoffm. McCall’s Ferry, on rocks. 
P. canina (L.) Hoffm. Conewago — Small. 
P. horizontalis (L.) Hoffm. McCall’s Ferry, on rocks. 
COLLEMEuE. 
Collema, Holfm. 
C. nigrescens (Huds.) Ach. Little Chiquesalunga, on moist limestone rocks — 
Small. 
Leptogium, Fr. 
L. myochroum (Ehrh.) Tuck. var. saturninum (Sm.) Schser. Tucquan — 
Porter. 
Hydrothyria. Russell. 
H. venosa, Russell. Mt. Hope, on wet rocks — Porter. 
LECANORE^. 
Placodium, DO. 
P. aurautiacum (Lightf.) Naeg. & Hepp. McCall’s Ferry, on stones. 
P. Cerinum (Hedw.) Naeg. & Hepp. Mill Creek, on fences. 
Lecanora, Ach. 
L. pallida (Schreb.) Schaer., var. cancriformis, Tuck. Conewago, on Ailan- 
thus. 
L. subfusca (L.) Ach. Mill Creek, on dead chestnut bark; Conewago, on 
Ailanthus. 
L. varia (Ehrh.) Nyl. Conewago, on Acer rubrum and fences ; Mill Creek, 
on telegraph poles and dead chestnut bark. 
Pertusaria, DO. 
P. COminUllis, DC. Cedar Hill, on Ostrya Virginica ; Conewago, on Acer 
rtibrum. 
P. pustulata (Ach.) Nyl. Conewago, on Ailanthus. 
P. velata (Turn.) Nyl. Cedar Hill, on yuniperus Virginiana. 
OLADONIE^. 
Stereocaulon, Schreb. 
S. paschale (L.) Fr. Mountville on the ground — Mrs. A. F. Eby. 
