167 



B. papillata v. albo-cincta, Th. Fr Northwest. 



Opegraplia subvulgata, Nyl., Flora, 18G9 Mexico. 



Grapliis pruinosa (Escliw.), Nyl., N. Gr. p. 5G4 Mexico. 



Segestria nucula v. granulata, Nyl., Antill., p. 22 Mexico. 



Verrucaria Campsteriana, Linds. 1. c, p. 343 Greenland. 



[^Tliis and V. tartaricola Linds. are probahly parasitic fungi-l 



§ Pyrenula subelliptica, Tuck., Lea Cincinn. p. 47 Ohio. 



Phacopsis vulpina, Tul California. 



Opegrapha antiqua, Lesq., in Hayden's Report, 1873, pp. 370, 418, is the only 

 fossil Lichen as yet recorded on this Continent. 



CORRECTIONS. 



LTmbilicaria niammulata, Ach.= U. spodochroa. 



U.- polyphylla v. deusta = U. flocculosa Hoffin. 



Sticta crenulata, Del.= S. Ravenelii T. = S. erosa (Eschw.). 



Pannaria Michneri, T. = P. molybdaea Pers. f. 



Synalissa lignyota should be S. f uliginea (Wahl.). 



Lecanora coniza, T. =: L. subf usca. 



Urceolaria hybocarpa, T. = L. subfusca, f. 



Stereocaulou chlorellum, T. is not a species, the specimens belonging to Eam- 



alina. 

 Biatora leucoblephara, Nyl., perhaps does not differ from B. tricholoma, Mont. 

 Lecidea grossa. Pars, should be transferred to Heterothecium. 

 Arthonia pruinosa, Ach. = A. impolita (Ehrh.). 

 Page 10, after No. 202, insert : 6. Spores muriform, plurilocular. 



POSTSCEIPT. — Since these pages were sent to the printer, I have 

 had the opportunity of examining the Lichens collected by Dr. 

 Coulter, Botanist to the United States Exploring Expedition to 

 Colorado, during the summer of 1873. Among them are three 

 which are new to the United States, but occur in Europe, as follows : 



1. Solorina bispora, Nyl. 



2. Lecanora calcarea (L.), Sinf., with an elegantly effigurate thallus. 



3. Endococcus erraticus (Mass.), Nyl. Parasitic on Placodium elegans. 



