AND BRITISH AMERICA. Za 



nose-reticulate, broadly round-lobed, cinereous-virescent ; rugulose and 

 somewhat villous beneath, with small, white, sorediiform cyphellse ; 

 lobes somewhat crenate; apoth. scattered, disk at length convex, black, 

 and excluding the entire thalline margin. Ach. Syn. p. 233. 



On the earth, among mosses ; Northwest Coast, Menzies ! New 

 York, Halsey. The upper surface resembling that of S. pulmonaria. 



7. S. pulmonaria., Ach. Th. coriaceous, lax, lacunose-reticulate, 

 dark green (and olivaceous) ; tomentose on the under side, with naked, 

 white spots; lacinice elongated, discrete, sinuate-lobed, retuse-truncate ; 

 apoth. submarginal, rufous. Fr. Lichenogr. p. 53. Lichen pulmona- 

 rius, L. 



Trunks in mountain forests, fertile. Also on rocks, where various 

 sterile forms are found. Among these is S. linita, Ach., quoted by 

 Delise as from the United States, which has occurred at the White 

 Mountains, with all the features of the Swiss Lichen. New England. 

 New York, Torrey. Pennsylvania, Muhl. Newfoundland, Pylaie. 



8. S. glomerulifera, Delis. Th. coriaceous-cartilagineous, thick, or- 

 bicular, appressed, smooth, from pale green becoming glaucescent ; 

 villous on the under side, with scattered, excavated cyphellse (which 

 are often wanting) ; lacinise elongated, sinuate-lobed ; apoth. scattered, 

 dark-reddish-chestnut, with a rugose, persistent margin. Delis. Siict. 

 p. 129. Tuckerm. Further Enum. I. c. Parmelia, Ach. 



Trunks of trees, and rocks, fertile ; New England. Pennsylvania, 

 Muhl. in herb. Willd. ! Northward to Newfoundland, Pylaie. The 

 green glomerules of the European Lichen always wanting in ours. 

 Young plants of this species may be taken for the next. 



9. S. herhacea, Ach. Th. membranaceous, appressed, smooth, ob- 

 scurely green (and glaucescent) ; on the under side paler, lanuginous, 

 the membranaceous, hoary cyphelte rare ; lacinise sinuate-repand, 

 rounded at the apices ; apoth. scattered, rufous, margin crenulate. Ach. 

 Syn. p. 341. Parmelia, Ach, Syn. p. 198. 



Trunks and rocks. Pennsylvania, Muhl. New York, Torrey, Hal- 

 sey. Arctic America, Rich. 



IX. PARMELIA, Ach., Fr. 



Apothecia scutelliform, orbicular, adnate horizontally to the disk of 

 the thallus, with an equal thalline margin. Disk at first connivent- 



