CATALOGUE OF PLANTS. 367 



HYDROTHYRIA, Russell. 

 H. venosa, Russell. 



Bergen : Austin. Warren : Adhering to stones under water, 

 in streams ; frequent Eckfeldt. 



LECANORE^E. 



PLACODIUM, DC. 



P. cerinum (Hedw.), Nseg. & Hepp. 



Bergen : Austin. Warren : Calcareous rocks. Camden : 

 Trees and shrubs Eckfeldt. 



P. cinnabarinum (Ach.), Anz. 



Bergen: Austin. Calcareous rocks. Warren :- Eckfeldt. 



P. aurantiacum (Lightf.), Naeg. & Hepp. 

 On rocks and cedars ; common. 



P. camptidium, Tuck. 



On maple trunks. Camden : Eckfeldt. 



P. ferrugineum (Huds.), Hepp. 



Bergen : Austin. Camden : On branches and trunks 

 Eckfeldt. 



Var. Pollinii, Tuck. 



On cedar. Camden : Eckfeldt. 



P. microphyllinum, Tuck. 



On old cedar rails. Camden : Eckfeldt. 



P. vittellinum (Ehrh.), Nieg. & Hepp. 



Bergen : Austin. Camden : Old cedar rails Eckfeldt. 



P. citrinum (Hoffm.), Leigh t. 



On old buildings and ancient mortar, and peculiar to calca- 

 reous rocks Eckfeldt. 



P. rupestre (Scop.), Br. & Rostr. 



Eocks. Warren : Eckfeldt, 



