Pink: lichens of the Minnesota \'AI, lev. 287 



Physcia stellaris (L.) Tick. var. apiola Nyi.., A. 

 Physcia caesia (Hoffm.) Nyl. 

 Placodium elegans (Link.) DC. 

 Placodium murorum (IIoffm.) DC, A. 

 Placodium cinnabarrinum (Acii.) Auz. 



Placodium cerinum (IIi:o\v.) Naeg. and IIeim'. var. sideritis 

 Tuck. 



Placodium vitellinum (Ehrh.) Naeg. and Hi: pp. 

 Lecanora rubina (Viel.) Acii. 



Lecanora rubina (V^iee.) Acii. var. heteromorpha Ach. 

 Lecanora muralis (Schreb.) Schaer., A. 

 Lecanora muralis (Sciireb.) Schaer. var. saxicola Schaer. 

 Lecanora frustulosa (Dicks.) Mass., A. 

 Lecanora subfusca (L.) Ach. var. allophana Acii., A. 

 Lecanora subfusca (L.) Acii. var. coilocarpa Acii., A. 

 Lecanora hageni Acii., A. 

 Lecanora cinerea (L.) Sommerf. 



Lecanora calcarea (L.) Sommerf. var. contorta Fr., A. 

 Lecanora xanthophana Nyl. 



Lecanora cervina (Pers.) Nyl. var. cinereoalba var. nov., A. 

 Lecanora fuscata (Schrad.) Tii. Fr., A. 

 Rinodina oreina (Acn.) Mass. 

 Rinodina sophodes (Acii.) Nyl., A. 

 Rinodina lecanorina Mass., A. 

 Urceolaria actinostoma Pers., A. 

 Biatora rufonigra Tuck., A. 

 Buellia spuria (Schaer.) Arn. 

 Buellia puUata Tuck. 

 Buellia petraea (Flot., Koerb.) Tuck. 

 Endocarpon miniatum (L.) Schaer., var. complicatum 

 Schaer. 



Comparing this lichen formation with tlie similar ones of the 

 Sioux quartzite and the pipestone, we find it to contain all 

 lichens found on the two excQ^i Physcia irihacia (Ach.) Tuck, 

 and to contain fourteen not found on them, which I have marked 

 as additions (A). The absence of the one species from the 

 Granite Falls formation is doubtless an accident in plant distri- 



