238 LICHENES. 



L. dactvlinuni, Tuck. Calcareous schists. 

 L. crenatellum. Tuck. Trunks near water. 

 L. niyochrouni, Ehrli. Trunks, infertile. 

 L. muscicola, Fr. Mossy trunks. 

 L. chloromelum, S\v. Hard bark of trees. 

 Hydrothyria veuosa, Russell. In mountain rivulets. 

 Placodium elegans, DC. Rocks ; Burlington, Wil- 

 lougliby Lake. 



P. miMoruni. DC. Rocks and stones. 



P. vitclliiiuiii. .Veil. Dead wood and rocks. 



P. cinnabariuuni. .Vuri. 



P. aurantiacuni. Light. ; okl fences. — var. fulvum. ; 



trunks and rocks. 

 P. cerinuni, Iledw. ; trunks, rocks and stones. — var. si- 



deritis. Tuck. ; rocks. 



P. rupestre, Nyl. Limerocks. 

 Lecanora Frostii, Tuck. Granitic rocks. 

 L. muralis, Schaer. Rocks and stones. 



L. cervina. var. glaucocarpa, Sommerf. ; limerocks. — 

 var. squamulosa ; granitic and limerocks. — var. dis- 

 creta, Fr. ; rocks. — var. privigna, Ach. ; rocks. — var. 

 pruinosa, Ach. ; limerocks. 



L. rubina. Vill. Rocks. 



L. frustulosa, Ach. Rocks. 



L. subfusca, Fr. ; trunks and rocks. — var. discolor, Fr. ; 

 trunks, etc. — var. distans. Fr. ; trunks, etc. 



L. elatina, var. ochropha^a, Tuck. Trunks of Firs. 



L. varia, Fr. Dead wood, stones and trunks. 



L. pallescens, Fr. Trunks, rails and stones. 



L. alliella, Ach. Trunks. 



L. tartarea, Ach. ; rocks in mountains. — var. frigida, 

 Ach. ; rocks in mountains. 



L. Cenisia, Fr. Rocks. 



L. atra, Ach. Rocks. 



L. cinerea. Fr. Rocks. 



