THE PLANTS OF THE PRIBILOF ISLANDS. 581 



Parmelia saxatilis, (L.) Fr, 



Common on rooks and eartli on both islands; freqnently foniid abnormally colored 

 from red-brown to a beantiful violet.- An isidiferous form on earth, St. (ieorge Island. 



Parmelia saxatilis, (L.), Fr., var. sulcata, Nyl. 



On rocks, St. George Island. 



Parmelia physodes, Ach., var. vittata, Ach. 

 On earth, St. Paul Island. 



TJmbilicaria rugifera, Nyl. 



On rocks on both islands, Nos. 27 and 28. Ghlorcalcio stratum corticale alterius 

 speciminis rubescit, alterius non mutatur. 



ITm.bilicaria cylindrica, (L.), Delis., var. delisoei, Despa. 



On rocks on both islands. 



Umbilicaria erosa, Ach. 



On rocks on both islands. 



Umbilicaria proboscidea, (L.), Stenh. 

 On rocks on both islands. 



Sticta linita, Ach. 



On damp rocks, St. Paul Island. 



Peltigera apthosa, (L.), Hoffm. 



On and in wide crevices of damp rocks on both islands. 



Peltigera canina, (L.), Hoffm. 



On moss on both islands. 



Peltigera canina, (L.), var. spongiosa. Tuck. 



With the last, but not so common. 



Peltigera canina, Hoffm., var. spuria, Ach. 



In a dense tuft of moss which it divided, St. Paul Island. 



Solorina crocea, (L.), Ach. 



On earth and rocks, St. Paul Island, 



Pannaria brunnea, (Sw.), Mass. 



On earth and rocks, St. George Island. 



Placodium elegans, (Link.), DC. 



Eare on rocks, St. Paul Island. 



Lecanora ventosa, (L.), Ach. 



On rocks, St. George Island. 



Lecanora tartarea, (L.), Ach. 



Common and variable on rocks on both islands. 

 Lecanora tartarea, Ach., var. frigida, (Sw.). 



Common on rocks, St. Paul Island. 

 Lecanora oculata, (Dicks.), Ach. 



On rocks, St. Paul Island. 



Lecanora oculata, (Dicks.), Ach., var. gonatodes, Ach. 



On rocks, St. Paul Island. Crtista Lecanora tartariae, halio lutescit et chlorcalcio 



rubescit. 



